摘要
采用批量平衡法,研究了6种低分子量有机酸(柠檬酸、酒石酸、苹果酸、乙酸、草酸和丁二酸)对3种粘土矿物(高岭土、蒙脱石、凹凸棒石)吸附二氯喹啉酸的影响。结果表明:当低分子量有机酸存在时,供试3种粘土矿物对二氯喹啉酸的吸附过程可用Linear和Freundlich吸附等温方程描述,且Freundlich方程的拟合效果更好。供试6种有机酸对二氯喹啉酸在高岭土中吸附量的影响程度从低到高依次为苹果酸<柠檬酸<草酸<乙酸<酒石酸<丁二酸,在蒙脱石中的顺序为乙酸<草酸<苹果酸<丁二酸<酒石酸<柠檬酸,在凹凸棒石中的顺序为乙酸<丁二酸<草酸<苹果酸<酒石酸<柠檬酸。不同浓度低分子量有机酸对3种供试粘土矿物吸附二氯喹啉酸均能产生显著的影响,但影响程度因粘土矿物和有机酸种类的不同而有较大差异。
The effect of low-molecular-weight organic acids （ citric acid, tartaric acid, malic acid, acetic acid, oxalic acid and succinic acid） on adsorption of quinclorac by three clay minerals （kaolinite, montmorillonite and attapulgite ） was investigated by a batch experimental technique. The results showed that the adsorption isotherm of quinclorac in clay minerals could be well described by Freundlich and Linear equation under the presence of low-molecular-weight organic acids, but the Freundlich equation was more suitable. The tested six kinds of low-molecular-weight organic acid showed different effects on adsorption quantity of quinclorac on kaolinite. The order from low to high influence were ： malic acid 〈 citric acid 〈 oxalic acid 〈 acetic acid 〈 tartaric acid 〈 succinic acid; whereas on montmorillonite from low to high order were. acetic acid 〈 oxalic acid 〈 malic acid 〈 succinic acid 〈 tartaric acid 〈 citric acid; on attapulgite： acetic acid 〈 succinic acid 〈 oxalic acid 〈 malic acid 〈 tartaric acid 〈 citric acid. In conclusion, the concentration of organic acid is a significant factor on adsorption of quinclorac by three clay minerals. This influence differentiates with types of clay mineral or organic acid.
出处
《农药学学报》
CAS
CSCD
北大核心
2013年第3期323-330,共8页
Chinese Journal of Pesticide Science
基金
湖南省研究生科研创新项目(CX2011B309)
农业部农药残留试验项目(NYBNYCL20100057)
关键词
低分子量有机酸
高岭土
蒙脱石
凹凸棒石
吸附
二氯喹啉酸
low-molecular-weight organic acid
kaolinite
montmorillonite
attapulgite
adsorption
quinclorac
