【作者】 李青； 陈国皓； 牛秀艳； 祖艳群；

【Author】 Li qing;Chen guohao;Niu Xiuyan;Zu yanqun;College of Resources and Environment,Yunnan Agricultural University;

【机构】 云南农业大学资源与环境学院；

【摘要】 为了研究不同淋洗剂对铅污染土壤的淋洗效果,以云南省兰坪铅锌矿区周边农田土壤为研究对象,选用振荡淋洗技术分别用草酸、酒石酸、氯化铁、柠檬酸、柠檬酸+EDTA、盐酸、乙酸对铅污染土壤中铅的淋洗效果进行对比分析,结果表明:①不同淋洗剂对土壤Pb的淋洗效果均存在差异。②随着淋洗剂浓度的增加,淋洗效果初期增长很快,后期逐渐趋于平缓。浓度0～1.2mol/L的范围内,淋洗效果依次为:氯化铁>草酸>盐酸>酒石酸>柠檬酸>乙酸,其中氯化铁最大淋洗效率可达到90%以上。③在0～8h内,淋洗时间越长淋洗效率越高,且盐酸>酒石酸>柠檬酸。④EDTA与柠檬酸在复配比为3:7、pH=3时对重金属污染土壤Pb的去除率分别为63.23%和50.93%。总之,氯化铁、草酸、盐酸对Pb的淋洗效果均较好;合理的淋洗温度可以提高土壤淋洗效率;复合淋洗剂比单一淋洗剂淋洗效果更好。更多还原

【Abstract】 In order to study the leaching effects of different leaching agents on Pb-contaminated soils,The leaching effects of oxalic acid,tartaric acid,ferric chloride,citric acid,citric acid+EDTA,hydrochloric acid and acetic acid on Pb-contaminated soil were compared and analyzed by oscillating leaching technology in the field soils around Lanping lead-zinc mining area,Yunnan Province.The results showed that:①The leaching effects of different leaching agents on soil Pb is different. ②With the increase of the concentration of leaching agents,the leaching effect increased rapidly in the initial stage and gradually became flat in the later stage.Within the concentration range of 0～1.2 mol/L,the leaching effect is as follows:ferric chloride> oxalic acid> hydrochloric acid> tartaric acid> citric acid> acetic acid,in which the maximum leaching rate of ferric chloride can reach more than 90%.③Within 0～8 hours,the longer the leaching time,the higher the leaching rate,and hydrochloric acid> tartaric acid> citric acid.④The ratio of EDTA to citric acid is 3:7,the removal rate of Pb in heavy metal contaminated soil is 63.23% and 50.93%.In general,ferric chloride,oxalic acid and hydrochloric acid have better leaching effect on Pb.Reasonable leaching temperature can improve soil leaching rate;Compound eluent is better than single leaching agent.更多还原