Sorption of dodecyltrimethylammonium chloride (DTAC) to agricultural soils.
Quaternary ammonium compounds (QACs) used as cationic surfactants are intensively released into environment to be pollutants receiving more and more concerns. Sorption of dodecyltrimethylammonium chloride (DTAC), one of commonly used alkyl QACs, to five types of agricultural soils at low concentrations (1-50mg/L) was investigated using batch experiments. DTAC sorption followed pseudo-second-order kinetics and reached reaction equilibrium within 120min. Both Freundlich model and Langmuir model fitted well with DTAC isotherm data with the latter better. DTAC sorption was spontaneous and favorable, presenting a physical sorption dominated by ion exchanges. Sorption distribution coefficient and sorption affinity demonstrated that soil clay contents acted as a predominant phase of DTAC sorption. DTAC could display a higher mobility and potential accumulation in crops in the soils with lower clay contents and lower pH values. Sorption of DTAC was heavily affected by ions in solution with anion promotion and cation inhibition.
Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, School of Environment, Jinan University, Guangzhou 510632, China.
Lei
L
Xiang
Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, School of Environment, Jinan University, Guangzhou 510632, China.
Teng-Fei
TF
Sun
Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, School of Environment, Jinan University, Guangzhou 510632, China.
Mei-Jie
MJ
Zheng
Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, School of Environment, Jinan University, Guangzhou 510632, China.
Yan-Wen
YW
Li
Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, School of Environment, Jinan University, Guangzhou 510632, China.
Hui
H
Li
Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, School of Environment, Jinan University, Guangzhou 510632, China; Consortium on Health, Environment, Education and Research (CHEER), Department of Science and Environmental Studies, Institute of Education, Tai Po, Hong Kong, China.
Ming-Hung
MH
Wong
Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, School of Environment, Jinan University, Guangzhou 510632, China. Electronic address: cai_quanying@yahoo.com.
Quan-Ying
QY
Cai
Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, School of Environment, Jinan University, Guangzhou 510632, China. Electronic address: tchmo@jnu.edu.cn.
Ce-Hui
CH
Mo
D000327:Adsorption; D000383:Agriculture; D008956:Models, Chemical; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*
D000644:Quaternary Ammonium Compounds; D012987:Soil; D012989:Soil Pollutants; D013501:Surface-Active Agents; C022806:dodecyltrimethylammonium
Agricultural soil; Clay contents; Ion exchanges; Quaternary ammonium compounds; Sorption