Assessment of groundwater quality for drinking and irrigation purpose using hydrochemical studies in Dera Bassi town and its surrounding agricultural area of Dera Bassi Tehsil of Punjab, India

Abstract

Present research aims to assess the suitability of groundwater of Dera Bassi town (Punjab) and its surrounding agricultural area for drinking as well as irrigation purpose. Thirty groundwater samples were collected (in February 2020) and analyzed for various physicochemical parameters. Results of physicochemical analysis were compared with Indian (IS 10500:2012) as well as WHO (2006) standards to ascertain the suitability of the groundwater samples for drinking purpose, and it has been found that results for almost all the parameters except alkalinity (at few sites) are within the permissible limit. The pattern of ionic dominance was observed in the order of Ca2+ > Mg2+ > Na+ > K+ for cations and Cl > NO3 > SO42− > F for anions. Further, according to the observed Kelly’s ratio, sodium adsorption ratio, sodium percentage, corrosivity ratio and permeability index, the groundwater samples were found to be fit for irrigation purpose. However, the magnesium ratio and residual sodium carbonate revealed that groundwater of the area under study is not fit for irrigation purpose at some sites. The plot of SAR values versus EC values in the US Salinity Laboratory diagram revealed that the majority of the samples fall under water type C3-S1 (high salinity—low SAR) and 36.77% samples fall under water type C2-S1 (medium salinity—low SAR). Gibb’s diagram revealed that all samples fall under rock dominance category. The values of index of base exchange (CAI 1 and CAI 2) indicate that both direct ion and reverse ion exchange processes are taking place in the region.

Introduction

Distribution of freshwater resources is not uniform across the globe, and with the increasing population the surface water resources seem to be inadequate in many parts of the world. Hence, groundwater is now being exploited as a major source to meet water demand for drinking and irrigation [1,2,3]. Nowadays, approximately one third population of the world rely on groundwater resources to meet their drinking water requirement [3, 4]. Though, groundwater contamination due to natural environmental changes and anthropogenic activities like agricultural and industrial activities is also getting degraded which is leading to water shortage crisis in many parts of the world [5, 6].

The scenario is more critical in India as the country ranks second in the world as per population and it is difficult to meet the drinking water demands of such a huge population. Hence, due to consumption of contaminated water, many people die every year in India [7]. The groundwater is considered as clean and safe for the drinking purposes in comparison with surface water because when it percolates through ground, majority of the pollutants get degraded [8]. Thus, in the last few decades groundwater has become an important commodity in India. In fact, India is now among the highest users of groundwater and total consumption per year is approximately 230 cubic kilometers of groundwater. However, excessive use of groundwater resources may affect the quality and quantity of the groundwater. India has more than 30 million groundwater extraction points and in the majority of these wells, water level decline was observed in pre-monsoon months from 2006 to 2015 [9]. Moreover, as it is well known that water is a universal solvent and has the ability to dissolve all substances that comes in its contact [10]. Hence, the groundwater quality gets affected by geochemical compositions of the rocks, as well as human activities [1]. Some minerals entering into groundwater are although important for the human beings and animals, but their higher concentration may also cause toxic effects [10].

Punjab is known as the “Granary of India” where different varieties of crops are grown. It is situated near to the Himalayas. In 1990, the modern agriculture model adopted by the state increased the crop productivity significantly with an application of chemical fertilizers, pesticides and intensive irrigation. The Punjab state is one of the highest consumers of fertilizers (243 kg/hectare per year) and pesticides [11, 12]. These fertilizers and pesticides enter in groundwater and surface water primarily through agricultural runoff. Although adopting these modern agriculture practices have played a vital role in achieving the maximum crop production but in the last few decades, intensive usage of agrochemicals has led to deterioration of surface as well as groundwater quality [13,14,15]. Agricultural modernization is not the only reason of deterioration of groundwater quality, but industrialization and urbanization are also contributing towards the degradation of water quality [16,17,18,19,20]. This deterioration of groundwater quality may cause a serious threat to the health of the people [21]. In Punjab, 90 cancer patients per 1 Lakh population have been reported and drinking of contaminated groundwater could be the one of the reasons [22].

Dera Bassi, Punjab, is an example where around 300 industries like Pharmaceuticals, Chemicals, Brick kilns, etc., are situated. The wastewater from some of these industries is flowing into a drain crossing between Dera Bassi and Bhankerpur. Even the groundwater of different villages and regions of Dera Bassi is deteriorating due to the effluent released from industries [23]. Therefore, in this study, the hydro-chemical parameters of groundwater were studied to check its suitability and safety for drinking and agricultural purpose.

Materials and methods

Study area

Dera Bassi is located in district SAS Nagar also known as Mohali. The district SAS Nagar is divided into three Tehsils, i.e. Dera Bassi, Mohali and Kharar. Dera Bassi Tehsil includes the total area of 389 km2 and its Dera Bassi town is spread over an area of 20 km2. Dera Bassi town is located on National Highway—152 on Chandigarh–Delhi Highway and near to Chandigarh, Mohali and Panchkula. It is an industrial town where various types of industries like pharmaceutical, chemicals, paper mills, brick kilns, electroplating, etc., are situated. The total area of the study region is 54 km2 which includes the Dera Bassi town and surrounding agricultural region with the coordinates 30.5887° N and 76.8471° E. Dera Bassi is located near foothills of the Sivalik Himalayas in northwest India at an average altitude of 1053 feet. Dera Bassi has a humid subtropical climate (very hot in summers and mild in winters) with large variation in temperature (− 1 °C to 46 °C). During monsoon, Dera Bassi receives moderate to heavy rainfall and sometimes heavy to very heavy rainfall. The study region receives normal monsoon rainfall of 619 mm, non-monsoon rainfall of 152 mm and annual average rainfall of 771 mm. The Ghaggar River flows at 5 km from the town of Dera Bassi. The region is occupied by quaternary alluvial sediments comprises of clay, silt, sand or the mixtures of all. The quaternary alluvial sediments are classified into two categories, i.e. newer alluvium and older alluvium. Quaternary alluvial sediments belong to the Indo-Gangetic alluvial plains, which form the main aquifer system. Groundwater present at the phreatic conditions in the shallow aquifer and leaky confined to confined conditions in the deeper aquifers. The groundwater resources are available in the study area at a varying depth of 11.73 m to 300 m. Groundwater resources are over-exploited in this area.

Groundwater sampling and analysis

Before the rainy season (February 2020), thirty groundwater samples were collected from various locations of Dera Bassi. The list of sampling sites is given in Table 1, and Fig. 1 shows the locations of different sampling in the study area. Groundwater samples were collected in high-grade polythene bottles of 1L capacity after 5 min of pumping from bore wells/hand pumps. Samples were kept at 4 °C and taken to the laboratory for further chemical testing. Methods and procedures followed during the analysis of cations and anions were according to the APHA, 2017 [24]. Electrical conductivity was determined by the standard conductivity meter and the precision of the instrument ranges from 0.1 to 1%. The total dissolved solids concentration was measured by using standard glass fiber filter method. Alkalinity, hardness, calcium ion and chloride were analyzed by titration method. Magnesium ion concentration was calculated from the formula using total hardness and calcium hardness. First of all, calcium hardness was determined by multiplying the calcium ion concentration with a factor of 2.5. Further, magnesium ion concentration was determined by multiplying the difference of total and calcium hardness with 0.243. Fluoride and nitrate were analyzed by spectrophotometric technique. For the analysis of sulphate, a turbidimetric method was used and it works in the range of 1 to 40 mg/L. Flame emission photometric method was used to calculate the sodium and potassium concentration in the groundwater.

Table 1 Sampling sites in Dera Bassi region of Punjab
Fig. 1
figure1

Location of Dera Bassi, SAS district, Punjab

Evaluation of groundwater quality for irrigation purpose

Groundwater is also used as irrigational water in the Dera Bassi region, so the irrigation water quality is required to evaluate. Hence, following parameters are considered to evaluate the suitability of groundwater for irrigation purpose:

Sodium adsorption ratio (SAR)

The sodium adsorption ratio (SAR) value is determined from the concentration of the main alkaline and earth alkaline cation available in the water. Richard [25] had given an equation to calculate the values of sodium adsorption ratio, which is given as:

$${\text{SAR}} = \frac{{{\text{Na}}^{ + } }}{{\sqrt {\left( {{\text{Ca}}^{2 + } + {\text{Mg}}^{2 + } } \right){/}2} }}$$
(1)

Cation concentration is expressed in meq/L. If the concentration of sodium is high in irrigation water, then it may increase the soil sodium content and due to that permeability of soil may get affected which causes infiltration problems. The dispersion of soil may occur and the soil becomes hard to plough [26].

Sodium percentage (Na%)

Wilcox [27] estimated the sodium percentage for classification of irrigation water as per Eq. (2).

$$\% {\text{Na}} = \frac{{\left( {{\text{Na}}^{ + } + {\text{K}}^{ + } } \right) *100}}{{\left( {{\text{Ca}}^{2 + } + {\text{Mg}}^{2 + } + {\text{Na}}^{ + } + {\text{K}}^{ + } } \right)}}$$
(2)

All the cations are expressed in meq/L. Higher percentage of sodium ion in irrigation water results in displacing the Ca2+ and Mg2+ from soil in exchange of Na+ in water. When sodium reacts with the soil, permeability of soil gets affected and soil becomes very hard to plough which means that sodium concentration is important to evaluate to know the irrigation water quality.

Kelly’s ratio (KR)

Kelly [28] had given an equation which is expressed as:

$${\text{KR}} = \frac{{{\text{Na}}^{ + } }}{{{\text{Ca}}^{2 + } + {\text{Mg}}^{2 + } }}$$
(3)

where cation concentration is given as meq/L. Kelly’s ratio should be less than 1. If the value exceeds 1, groundwater is considered unfit for irrigation. High amount of sodium in irrigation water, then sodium ions are absorbed by clay particles replacing the calcium and magnesium ions which causes the dispersion of clay particles and diminishes the permeability of soil and can eventually affect the internal drainage.

Magnesium ratio (MR)

Szabolcs and Darabin [29] proposed an equation called as magnesium ratio which is expressed as:

$${\text{MR}} = \frac{{{\text{Mg}}^{2 + } }}{{{\text{Ca}}^{2 + } + {\text{Mg}}^{2 + } }}*100$$
(4)

All cations should be in meq/L. Magnesium ratio in water should be more than 50% for irrigation purpose because high concentration of magnesium increases the soil alkalinity and affects the soil quality [30, 31].

Corrosivity ratio (CR)

Corrosivity ratio is expressed as:

$${\text{CR}} = \frac{{\frac{{{\text{Cl}}^{ - } }}{35.5} + 2\left( {\frac{{{\text{SO}}_{4}^{2 - } }}{96}} \right)}}{{2\left( {\frac{{{\text{HCO}}_{3}^{ - } + {\text{CO}}_{3}^{2 - } }}{100}} \right)}}$$
(5)

All the anions should be in meq/L. Corrosivity ratio expresses whether the transportation of water through pipe is possible or not. CR value should be less than 1 for the transportation of groundwater through pipes. If the value exceeds 1 that specifies the corrosive nature of groundwater and in such case, noncorrosive pipes are required for uplifting and transportation of groundwater [32].

Residual sodium carbonate (RSC)

If higher percentage of HCO3 and CO32− is present in groundwater, then these may tend to form precipitates with Ca2+and Mg2+ ions and excess amount of NaHCO3 and CaCO3 may be hazardous for the structure of soil. Eaton [33] had given an equation to calculate the RSC:

$${\text{RSC}} = \left( {{\text{HCO}}^{3 - } + {\text{CO}}_{3}^{2 - } } \right){-}\left( {{\text{Ca}}^{2 + } + {\text{Mg}}^{2 + } } \right)$$
(6)

All the anions and cations are expressed in meq/L. As per Lloyd and Heathcote [34] classification, water with RSC value below 1.25 is suitable and up to 2.5 is marginally suitable for irrigation. But RSC value above 2.5 is considered as unsafe for the irrigation purpose.

Permeability index

Doneen [35] developed permeability index to estimate the fitness of water for irrigation uses.

$${\text{PI}} = \frac{{{\text{Na}}^{ + } + \sqrt {{\text{HCO}}_{3}^{ - } } }}{{{\text{Ca}}^{2 + } + {\text{Mg}}^{2 + } + {\text{Na}}^{ + } }}*100$$
(7)

Groundwater water can be categorized into three classes on the basis of PI. The class I water shows 100% maximum permeability is suitable for irrigation. The class II water shows 75% maximum permeability and is marginally fit for irrigation, whereas the class III water having 25% maximum permeability is unsuitable for irrigation.

Result and discussion

Results of all the water quality parameters for the groundwater samples of the area under study are shown in Table 2.

Table 2 Summary of physico-chemical parameters of samples

Groundwater quality assessment for drinking purpose

Values of different parameters observed in present study are compared with the Indian standards (BIS 2012) [36] and WHO (2006) standards [37] as mentioned in Table 2.

It was observed that the pH values for all samples were within the permissible limits. The observed concentrations of EC were ranging from 583 to 1596 μS/cm. Total dissolved solids (TDS) concentration in the groundwater samples varied from 337 to 937 mg/L with an avg. value of 555.7 mg/L. It is evident from Fig. 2a that TDS concentration of sixteen samples was within desirable limits while for the rest of the 14 samples (S1, S2, S4, S8, S9, S13, S15, S20, S22, S23, S26, S27, S28 and S30) concentration was between desirable and permissible limits. None of the sample was having value greater than the permissible limits. TDS concentration more than 500 mg/L has been reported to affect the digestive system and hence, not considered to be safe for drinking purpose [36].

Fig. 2
figure2

Spatial distribution maps of different water quality constituents, i.e. a TDS, b alkalinity, c hardness, d calcium and e magnesium

The bicarbonate alkalinity in the groundwater samples of the area under study was also analyzed. Bicarbonate is formed when two different sources of carbon dioxide, one is atmospheric and other is carbon dioxide, present in the soil gets dissolved in the groundwater. Alkalinity of water samples taken from the region was found to be varied from 305 to 980 mg/L. Figure 2b specifies that that groundwater alkalinity was more than desirable limit of 200 mg/L for all the samples [36]. Out of total 30 samples, 23 samples were falling between desirable and permissible limits and rest of the 7 samples (S1, S2, S13, S15, S26, S27, and S28) were falling above permissible limit of 600 mg/L. The minimum concentration of sodium was 3.4 mg/L, and maximum concentration was 64 mg/L in the collected samples.

The concentration of total hardness found in the region varies from 172 to 555 mg/L. The values of total hardness for only 3 samples (S8, S13, and S20) were below desirable limit while values for 27 samples were between desirable and permissible range. However, 96% of the groundwater samples fall in the category of very hard water (Fig. 2c).

As per the obtained results for the concentration of various cations and anions under consideration, the order of the mean concentration for cation is Ca2+ > Mg2+ > Na+ > K+ while the order of the mean concentration for anions is Cl > NO3 > SO42− > F. The concentrations of Ca2+ and Mg2+ ions varied from 39 to 96 mg/L and 11.42 to 90.57 mg/L, respectively. Twenty-six groundwater samples were having calcium ion concentration below maximum desirable limit and only four groundwater samples (S1, S2, S27, and S30) were found to have calcium ion concentration more than the maximum desirable limit (Fig. 2d). On the other hand, magnesium ion concentration for 10 samples was below the desirable limit; however, rest of the 20 groundwater samples (S1, S2, S3, S4, S8, S9, S10, S13, S15, S16, S17, S20, S22, S23, S24, S26, S27, S28, S29 and S30) were having magnesium ion concentration above the maximum desirable limit (Fig. 2e).

It was observed that the potassium concentrations were within the permissible limits, i.e. 10 mg/L as given by European Economic Community for all the water samples. The potassium concentration varied from 1.6 to 4.6 mg/L. Sodium and potassium are not considered as a drinking water parameter in BIS 2012 standards [36], while it was found that the concentrations of sulphate, nitrate, chloride and fluoride for all the collected water samples have reported below the desirable limit.

Water quality classification for irrigation

There are different irrigation parameters mentioned in Table 3 on the basis of which classification of the water samples of the study area is done. TDS concentration for all the groundwater samples was found to be less than 1000 mg/L; thus, these samples can be classified as fresh water or non-saline. Also, it is mentioned that high EC in water can make the soil saline. Thus, EC value plays critical role in determining the fitness of water for irrigation purposes. As per EC value of the groundwater samples of the area under study, about 36.33% of the samples were classified as good category and rest of the all samples fall under permissible category. The values of SAR in the samples varied from 0.08 to 1.99. All the groundwater samples have shown SAR < 10 and considered as excellent for irrigation (Table 3). Further, by plotting obtained values of SAR (sodium hazard) and EC (salinity hazard) on the US Salinity Laboratory (USSL) diagram, the class/type of irrigational water can also be determined. From the plot (Fig. 3), it is evident that groundwater of only 36.77% falls under water type C2-S1 (medium salinity—low SAR), such water can be used to irrigate soil with moderate leaching and only for those plants which are moderately salt tolerant and can grow without adopting any special practices for salinity control. At rest of the 64.33% sites, groundwater belongs to category C3-S1 (high salinity—low SAR). Hence, the water of these sites cannot be used as irrigation water for the soils with limited drainage. However, in order to use the water of these site even for the soils with adequate drainage, special management practices for salinity control need to be implemented and only plants with high salt tolerance could be selected.

Table 3 Categorization of Groundwater samples for Irrigation Purpose
Fig. 3
figure3

US Salinity Laboratory (USSL) diagram

Sodium percent values varied from 3.08 to 45.86%, indicating that all groundwater samples were below permissible value. Further according to the Kelly’s ratio, the collected groundwater samples were fit for irrigation purpose as they fall below 1 (Table 3). Magnesium ratio was calculated for the collected samples and observed that only 53.33% groundwater samples were fit for the irrigation use (Table 3). Samples S1, S2, S5, S6, S7, S11, S14, S18, S19, S21, S26, S27, S28, and S30 has magnesium ratio less than 50%. So, these samples are considered as unsuitable for the irrigation purpose according to the magnesium ratio.

Lloyd and Heathcote [34] had introduced an equation to calculate the residual sodium carbonate (RSC). Only 20% samples fall under suitable category with RSC < 1.25, 36.66% samples can thus be considered in marginally suitable category with RSC value from 1.25 to 2.5, however, 43.33% fall in the unsuitable category with RSC > 2.5 (S1, S2, S5, S6, S8, S13, S15, S18, S20, S21, S26, S27, S28 are unsuitable for irrigation according to the RSC). The corrosivity ratio (CR) for all samples was less than 1 which indicated that groundwater can be transported through the pipes.

In the present study, permeability index ranges from 43.42 to 80.07. As per Doneen [35] classification of water on the basis of PI values, 90% of samples from the study area come under class I category signifying that water is good for irrigation uses at majority of sites. Even also in the rest of the sites, groundwater lies in class II and is marginally fit for irrigation.

Mechanism controlling groundwater chemistry

The Pearson correlation matrix (Table 4) is used to recognize the relationship between different variables. Value of correlation coefficient less than 0.5 is considered weak correlation, 0.5–0.75 as moderate correlation and more than 0.75 as strong correlation. Significant positive correlation was noticed between EC-TDS (r = 0.99), EC-TA (r = 0.98), EC-TH (r = 0.84), EC-Ca2+ (r = 0.76), EC-Mg2+ (r = 0.71), EC-SO4 (r = 0.92), TDS-TA (r = 0.97), TDS-TH (r = 0.82), TDS-Ca2+ (r = 0.79), TDS-Mg2+ (r = 0.68), TDS-SO4 (r = 0.89), TA-SO4 (r = 0.94), TA-TH (r = 0.79), TA-Ca2+ (r = 0.76), TA-Mg2+ (r = 0.64), TH-Ca2+ (r = 0.72), TH-Mg2+ (r = 0.94), TH-SO4 (r = 0.77), TH-NO3 (r = 0.67), which revealed that the presence of TH, TA, Ca2+, Mg2+ and SO4 was strongly correlated with EC and TDS.

Table 4 Correlation matrix of various chemical parameters of groundwater samples of Dera Bassi

Significant positive correlation between EC and Mg2+ (r = 0.71), K+ (r = 0.43), NO32− (r = 0.54) and SO42− (r = 0.92) shows that these ions are contributing significantly to EC [26] and suggest that significant anthropogenic activities are responsible for the addition of these ions into the groundwater of the region [6]. Further, moderate correlation of NO32− and Cl (r = 0.51) elucidates the presence of anthropogenic sources such as punctured sewer pipelines [6], whereas moderate positive correlations among Ca+ and NO32− also reveal the impact of fertilizers in the groundwater [26]. The total hardness (TH) has strong correlations with Mg2+ (0.94), SO42− (r = 0.77), and a moderate correlation with Ca2+ (0.72), NO32− (r = 0.67) indicates that hardness is mostly related to Mg2+ than Ca2+ [26] and is permanent hardness. Not only anthropogenic sources but natural sources of are also affecting the groundwater quality which is indicated from strong correlation of SO42− with Ca2+ (r = 0.83) that point to the dissolution of gypsum mineral from the rock matrix as a reason of the addition of SO42− in groundwater of this region.

Hydrogeochemical type of groundwater

Chadha [39] had introduced a diagram to investigate various hydro-geochemical processes. The diagram has been plotted by changing values into percentage equivalents (meq%). The X axis is representing the difference between percentages of Ca2+ + Mg2+ (alkaline earth metals) and Na+ + K+ (alkali metals) for cations and the Y axis representing difference among CO32− + HCO3 (weaker acidic anions) and Cl + SO42− (stronger acidic anions) has shown in Fig. 4. Results obtained from the Chadha’s plot have shown that most of the groundwater samples (27 samples) of study area belong to sub-field (6) which suggest that alkaline earth metals exceed alkali metals, whereas, strong acidic anions exceed weak acidic anions. These groundwater samples of study area belong to Ca2+−Mg2+−Cl type, or Ca2+−Mg2+ dominant Cl type, or Cl dominant Ca2+−Mg2+dominant type. However, groundwater samples of 3 sites belong to sub-field (8) which indicate that in groundwater sample of those areas, alkali metals exceed alkaline earth metals and weak acidic anions exceed strong acidic anions and the samples belong to Na+–HCO3 type, or Na+dominant HCO3 type, or HCO3 dominant Na+ type [39]. Such groundwater generates residual sodium carbonate during irrigation use and also cause foaming problems.

Fig. 4
figure4

Chadha’s plot representing hydrochemical processes and percentage of various cations and anions present in groundwater samples

Gibbs diagram and water–rock interaction

In order to ascertain the suitability of ground water for both domestic and irrigation purposes, groundwater chemistry is a main conclusive factor [30] and the groundwater chemistry itself is usually governed by three natural mechanisms, i.e. evaporation rate, atmospheric precipitation and the water–rock interaction [3, 40]. To explain the role of these three important natural mechanisms in controlling the major ion chemistry of the groundwater, Gibbs [41] introduced Gibbs scatter diagram. Gibbs ratio 1(for anion) and Gibbs ratio 2 (for cation) were calculated in order to draw the scatter diagram using the equations given below:

$${\text{Gibbs}}\;{\text{Ratio}}\;1 = \frac{{{\text{Cl}}^{ - } }}{{\left( {{\text{Cl}}^{ - } + {\text{HCO}}_{3}^{ - } } \right)}}$$
(8)
$${\text{Gibbs}}\;{\text{Ratio}}\;2 = \frac{{{\text{Na}}^{ + } + {\text{K}}^{ + } }}{{{\text{Na}}^{ + } + {\text{K}}^{ + } + {\text{Ca}}^{2 + } }}$$
(9)

It is clear from Gibbs diagrams (Fig. 5a–b) that all the water samples fall in rock dominance category which indicate that chemical weathering of rock minerals is affecting the quality of groundwater [1, 4].

Fig. 5
figure5

Gibbs diagram for a Gibbs ratio (cations); b Gibbs ratio (anions)

Plot between Ca + Mg (meq/L) and HCO3 + SO4 (meq/L) expresses information regarding the weathering and dissolution of minerals. This plot can also provide information about the main minerals contributive to groundwater mineralization [42]. It is clearly evident from the scatter diagram of Ca + Mg (meq/L) and HCO3 + SO4 (meq/L) (Fig. 6) that the silicate weathering was the primary process involved in the evolution of groundwater as majority of samples (approx. 73%) fall below the equiline [43].

Fig. 6
figure6

Plot representing (Ca + Mg) versus (HCO3 + SO4)

Index of base exchange

The chemical characteristics of groundwater get changed because of the ion exchange during percolation [44]. To know ion exchange taking place in the groundwater and its host environment, the Chloro-alkaline indices (CAI 1 and CAI 2) are evaluated by applying the following equations [45].

$${\text{Chloro - alkaline}}\;{\text{index}}\;1 = \frac{{{\text{Cl}} - \left( {{\text{Na}} + {\text{K}}} \right)}}{{{\text{Cl}}}}$$
(10)
$${\text{Chloro - alkaline}}\;{\text{index}}\;2 = \frac{{{\text{Cl}} - \left( {{\text{Na}} + {\text{K}}} \right)}}{{{\text{SO}}_{4} + {\text{HCO}}_{3} + {\text{CO}}_{3} + {\text{NO}}_{3} }}$$
(11)

According to Schollar [45], the CAI values will be negative if Ca and Mg of groundwater get exchanged with Na and K of aquifer material which represents the direct ion exchange. However, if Na and K present in groundwater get exchanged with Ca and Mg present in the aquifer material, then CAI values will be positive that will indicate the reverse ion exchange process. If CAI value comes out to be zero, it means no ion exchange process is favoured. In the present study, CAI 1 and CAI 2 values ranged from − 1.35 to 0.90 and − 1.16 to 1.78, respectively. The values of CAI 1 and CAI 2 were negative for 50% samples under investigation which represents that both normal ion exchange and reverse ion exchange processes prevail (Fig. 7).

Fig. 7
figure7

Chloro-alkaline indices for groundwater samples of Dera Bassi

Conclusion

The groundwater analysis for the Dera Bassi town and its surrounding agricultural area was carried out to assess its suitability for drinking and irrigation purposes. From the results obtained by physico-chemical analysis of the groundwater samples, it is clear that all of the water samples were below the acceptable limit of BIS (2012) and WHO (2006) for pH, F, Cl, NO3, and SO42−. However, samples exceeded the acceptable limit in case of TDS, TH, Alkalinity, Ca2+ and Mg2+ but found to be with in the maximum permissible limit except alkalinity whose value fall above the permissible limit at few sites. However, as per TH classification, 96% of the sampling sites fall in the category of very hard water category. Concentration of the anions for all the water samples were below the acceptable limit. The pattern of ionic dominance was observed as Ca2+ > Mg2+ > Na+ > K+ for cations and Cl > NO3 > SO42− > F for anions. Hydrochemical studies revealed that majority of groundwater samples of study area belong to Ca2+−Mg2+−Cl type, or Ca2+−Mg2+ dominant Cl type, or Cl dominant Ca2+−Mg2+ dominant type. type. Further, from the Gibbs diagrams it can be clear that all the water samples fall in rock dominance category which indicate that the quality of groundwater is being affected by chemical weathering of rock minerals. It is further evident from the plot between Ca + Mg (meq/L) and HCO3 + SO4 (meq/L) that the silicate weathering is the primary process involved in the evolution of groundwater as majority of samples (approx. 73%) fall below the equiline. Index to base exchange values indicates that both direct ion and reverse ion exchange processes were taking place in the region.

Sodium adsorption ratio (SAR), sodium percent (Na%) and Kelly’s ratio (KR) indicated that most of groundwater samples were safe for the irrigation use. However, magnesium ratio indicated that the only 53.33% groundwater sampling sites were suitable for irrigation use. Further, results of residual sodium carbonate (RSC) revealed that 20% groundwater samples from the study area were fit for irrigation, 36.66% were marginally fit for the irrigation use while 43.33% of samples (S1, S2, S5, S6, S8, S13, S15, S18, S20, S21, S26, S27, S28) fall under unsuitable category with RSC > 2.5. Further, based on PI values, 90% of samples come under class I category signifying that water is good for irrigation purpose at majority of sites of the study area; however, in the rest of the sites also it is marginally fit for irrigation purpose. Also, the CR results for all the water samples recommend that groundwater can be transported through pipes.

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Sharma, N., Vaid, U. & Sharma, S.K. Assessment of groundwater quality for drinking and irrigation purpose using hydrochemical studies in Dera Bassi town and its surrounding agricultural area of Dera Bassi Tehsil of Punjab, India. SN Appl. Sci. 3, 245 (2021). https://doi.org/10.1007/s42452-021-04199-y

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Keywords

  • Groundwater
  • Dera Bassi
  • Drinking and irrigation water quality
  • Chadha’s plot
  • Permeability index
  • Index of base exchange