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采用高效液相色谱仪及批量平衡试验方法,研究了乙酸、苹果酸、酒石酸、草酸、丁二酸和柠檬酸6种低分子量有机酸对麻沙泥和第四纪红土红壤吸附-解吸二氯喹啉酸的影响。结果表明:低分子量有机酸可推迟二氯喹啉酸在土壤中的吸附平衡时间,其吸附动力学过程可用准二级动力学方程描述。Linear和Freundlich方程能较好地拟合二氯喹啉酸在供试两种土壤中的吸附等温线;二氯喹啉酸在麻沙泥中的吸附能力(lg Kf值)从大到小依次为苹果酸>柠檬酸>草酸=乙酸>丁二酸>酒石酸,在第四纪红土红壤中为苹果酸>丁二酸>乙酸>草酸>柠檬酸>酒石酸;低分子量有机酸浓度对二氯喹啉酸解吸的影响因有机酸种类和供试土壤的不同而差异较大,6种供试有机酸均促进了第四纪红土红壤对二氯喹啉酸的解吸,且其解吸率均明显高于麻沙泥对二氯喹啉酸的解吸率,但在麻沙泥中呈现不同的影响模式。
The effects of acetic acid, malic acid, tartaric acid, oxalic acid, succinic acid and citric acid on the adsorption and desorption of quinoa in Quedong mud and Quaternary lateritic red soils were studied by high performance liquid chromatography and mass balance test. Acid effect. The results showed that low molecular weight organic acids could delay the adsorption equilibrium time of quinclorac in soil, and the adsorption kinetics could be described by pseudo second-order kinetic equation. Linear and Freundlich equations fit well the adsorption isotherms of quinclorac in the two soils. The adsorption capacity of quinclorac in marsh sand (lg Kf value) is in the order of malate > Citric acid> oxalic acid = acetic acid> succinic acid> tartaric acid, malic acid> succinic acid> acetic acid> oxalic acid> citric acid> tartaric acid in Quaternary red soil red soil; low molecular weight organic acid concentration desorbed quinclorac The influence of different organic acids and tested soil varied greatly. Six kinds of organic acids tested promoted the dissociation of quinclorac in quaternary laterite red soils, and their desorption rates were significantly higher than those of marshmallow The rate of dissociation of quinclorac is different, but shows different modes of influence in the mud.