Adsorption-desorption of cypermethrin and chlorfenapyr on Jordanian soils
- 15 Downloads
In this study, adsorption kinetic experiments were conducted on agricultural soil samples from Southern Jordan to investigate the adsorption behavior of the heavily used insecticide cypermethrin and the pesticide chlorfenapyr. Soil samples classified as sand and loamy sand with 1.77–2.02% organic matter content were collected from two locations within 0–30 cm depths in Tafilah, Jordan, and tested as adsorbents, and it was found that the adsorption of the two substances followed pseudo-second-order kinetics which implies that the adsorption process is chemisorption. The second-order rate constants were 1.01–2.03 g/mg h for cypermethrin and 11.38–13.03 g/mg h for chlorfenapyr. Adsorption isotherm experiments were also carried out at a constant temperature and variable initial adsorbate concentrations and it was found that the Langmuir model provided a slightly better fit to the adsorption data in comparison with the Freundlich model. The Langmuir maximum adsorption capacities were 8.88–9.08 mg/g for cypermethrin and 36.23–45.25 mg/g for chlorfenapyr while the Langmuir constants were 0.0123–0.0157 L/mg for cypermethrin and 0.003–0.0037 L/mg for chlorfenapyr. Higher adsorption rates were observed in the loamy sand soil due to the higher organic matter, clay, and silt contents. Nonetheless, it was concluded that the leaching potential of these substances to groundwater is low due to the physical nature of these chemicals as well as the adsorption behavior of the soil.
KeywordsAdsorption Cypermethrin Chlorfenapyr Groundwater Contamination Pesticides Insecticides
The authors wish to thank MEDRC Water Research and the Deanship of Scientific Research at the University of Jordan for funding this research.
- Abdel-Wali M, Mustafa T, Al-Lala M (2012) Residual toxicity of abamectin, milbemectin and chlorfenapyr to different populations of two spotted spider mite, Tetranychus urticae Koch, (Acari: Tetranychidae) on cucumber in Jordan. World J Agric Sci 8(2):174–178Google Scholar
- Almalike L, Al-Najar A, Kadhim Z (2015) Chemical kinetic, and thermodynamic of adsorption–desorption of cypermethrin in the soil of South Iraq. Int J Adv Res Tech 4(9):17–25Google Scholar
- El-Nahhal Y, Hamdona N (2017) Adsorption, leaching and phytotoxicity of some herbicides as single and mixtures to some crops. J Assoc Arab Univ Basic Appl Sci 22(1):17–25Google Scholar
- El-Nahhal Y, Safi J (2008) Removal of pesticide residues from water by organo-bentonites. The twelfth International Water Technology Conference: 1711–1724, Alexandria, Egypt.Google Scholar
- EPA (1999) Method 1664 Revision A: n-hexane extractable material (HEM; oil and grease) and silica gel treated N-hexane extractable material (SGT-HEM; non-polar material) by extraction and gravimetry. United States Environmental Protection Agency, Washington, DC.Google Scholar
- EPA (2012) Estimation Programs Interface Suite™ for Microsoft® Windows, v 4.11. United States Environmental Protection Agency, Washington, DC.Google Scholar
- Ghabbour E, Davies G (2007) Humic substances: structures, models and functions. Royal Society of Chemistry.Google Scholar
- Nir S, Undabeytia T, Yaron D, El-Nahhal Y, Polubesova T, Serban S, Rytwo G, Lagaly G, Rubin B (2000) Optimization of adsorption of hydrophobic herbicides on montmorillonite preadsorbed by monovalent organic cations: interaction between phenyl rings. Environ Sci Technol 34:1269–1274CrossRefGoogle Scholar
- Sun X, Yin X, Wang M (2013) Adsorption and mobility of chlorfenapyr in different soils. Agrochemicals 9:017Google Scholar
- Weister R (1992) Farm Chemicals Handbook’92. Meister Publishing Company, WilloughbyGoogle Scholar