Effects of 1-Alkyl-3-Methylimidazolium Nitrate on Soil Physical and Chemical Properties and Microbial Biomass
Ionic liquids (ILs), also called room temperature ILs, are widely applied in many fields on the basis of their unique physical and chemical properties. However, numerous ILs may be released into and gradually accumulate in the environment due to their extensive use and absolute solubility. The effects of 1-alkyl-3-methylimidazolium nitrate ([Cnmim]NO3, n = 4, 6, 8) on soil pH, conductivity, cation exchange capacity, microbial biomass carbon, and microbial biomass nitrogen were examined at the doses of 1, 10, and 100 mg/kg on days 10, 20, 30, and 40. The results demonstrated that the soil pH decreased and the conductivity increased with increasing IL doses. No significant differences were observed in the soil cation-exchange capacity. All three of the tested ILs decreased the soil microbial biomass carbon and nitrogen. Additionally, there were few differences among the ILs with different alkyl chain lengths on the tested indicators except for the microbial biomass nitrogen. The present study addressed a gap in the literature regarding the effects of the aforementioned ILs with different alkyl side chains on the physicochemical properties of soil, and the results could provide the basic data for future studies on their toxicity to soil organisms, such as earthworms and soil microbes.
Compliance with Ethical Standards
Conflict of interest
The authors declare that they have no conflict of interest.
The datasets generated during and analysed during the current study available from the corresponding author on reasonable request.
- Bado-Nilles A, Diallo AO, Marlair G, Pandard P, Chabot L, Geffard A, Len C, Porcher JM, Sanchez W (2015) Coupling of OECD standardized test and immunomarkers to select the most environmentally benign ionic liquids option: towards an innovative “safety by design” approach. J Hazard Mater 283:202–210CrossRefGoogle Scholar
- Bao SD (2000) Soil and agricultural chemistry analysis, 3rd edn. China Agriculture Press, BeijingGoogle Scholar
- Han Y, Ma FY, Xie GL, Qin GH, Ma SG (2014) Spatial heterogeneity of soil electrical conductivity in a mixed plantation of the Yellow River Delta saline land. Sci Soil Water Conserv 12:84–89Google Scholar
- Huang CY, Xu JM (2010) Soil Science, 3rd edn. China Agriculture Press, BeijingGoogle Scholar
- International Standardization Organization (1994) ISO 11265: soil quality: determination of the specific electrical conductivity. ISO, GenevaGoogle Scholar
- International Standardization Organization (2005) ISO 10390: soil quality: determination of pH. ISO, GenevaGoogle Scholar
- Lin XG (2010) Principles and methods of soil microbiology research. Higher Education Press, BeijingGoogle Scholar
- Tong YJ, Wang QJ, Ma YL, Lv YZ, Liu YY, Zhang R, Wu YX, Zhu SD (2011) Influence of ionic liquid 1-butyl-3-methylimidazolium chloride on soil physic-chemical property and soil microbiological community. J Wuhan Inst Technol 33:25–29Google Scholar
- Wu JS, Lin QM, Huang QY, Xiao HA (2006) Soil Microbial biomass-Methods and Application. China Meteorological Press, BeijingGoogle Scholar
- Yin LP, Zhang B, Li A, Kang YH, Liu JY, Zhang H, Cheng Y, Li WC (2014) Influence of soil pH value on geochemical behavior of heavy metals in soil. Liaoning Chem Ind 43:865–867Google Scholar