几种有机酸对污染土中Cu解吸的影响

Effect of organic acids on Cu desorption in contaminated soils.

研究了乙酸、苯甲酸、酒石酸和柠檬酸对几种污染土中Cu的解吸及介质条件(如pH值、支持电解质)对其解吸的影响.结果表明,4种有机酸对污染土中Cu解吸的影响强弱为柠檬酸>酒石酸>乙酸≈苯甲酸;随着有机酸浓度升高,乙酸、苯甲酸、酒石酸对污染土中Cu的解吸率先降低后升高,柠檬酸对Cu的解吸率则一直升高;随着解吸液起始pH值由2升至8,柠檬酸对污染土中Cu的解吸率呈降低-升高-降低的变化,酒石酸对污染土中Cu的解吸率则一直降低;随着支持电解质浓度升高,酒石酸对污染土中Cu的解吸率趋于增大,且KCl为支持电解质时的解吸率略高于KNO3.

Effect of four organic acids on Cu desorption in contaminated soil and the medium conditions (such as pH value, supporting electrolyte) was studied. The results showed that the effect degree of desorption ability of these acids on Cu in contaminated soils was in the following order: citrate>tartrate>acetate≈benzoate. With the increase of organic acid concentration, the desorption ratio of Cu for acetate, benzoate and tartrate, decreased first, then increased whereas it increased continuously for citrate. The desorption ratio for citrate decreased first, then increased, then decreased again with the increment of initial pH value from 2 to 8; while that for tartrate decreased continuously. The desorption ratio for tartrate tends to increase with the increase of supporting electrolyte concentration; moreover, the ratio with KCl electrolyte was a little higher than that with KNO3 electrolyte under the same electrolyte concentration.