酒石酸、柠檬酸和苹果酸对污染土壤中镧的去除效果  

Effects of Tartaric Acid,Citric Acid and Malic Acid Removing Lanthanum From Polluted Soils

作　　者：梁俊捷 张世熔[2] 廖成阳 肖罗怡 王贵胤[2] 

机构地区：[1]四川农业大学资源学院,四川成都611130 [2]四川农业大学环境学院/四川省土壤环境保护重点实验室,四川成都611130

出　　处：《生态与农村环境学报》2016年第1期115-119,共5页Journal of Ecology and Rural Environment

基　　金：四川省科技支撑计划(2014NZ0044)

摘　　要：通过振荡淋洗法研究了酒石酸、柠檬酸和苹果酸在不同浓度、淋洗时间和p H值条件下对2种污染农田土壤中镧(La)的去除效率。结果表明,在25℃、200 r·min-1恒温振荡条件下,3种淋洗剂对人工污染土壤镧的淋洗率均随浓度的增加而增加,随淋洗时间的延长而增加至稳定状态,随着p H值的增加呈先增加后减小趋势。3者的最佳淋洗浓度、时间和p H值分别为0.01 g·m L-1、4 h和5.0,在此条件下,酒石酸、柠檬酸和苹果酸对w(La)为300 mg·kg-1人工污染土壤的最佳淋洗率分别为57.13%、62.32%和54.86%,对w(La)为2 500 mg·kg-1人工污染土壤的最佳淋洗率分别为74.39%、77.94%和72.75%,对w(La)为463.6 mg·kg-1的矿区土壤的最佳淋洗率分别为17.8%、23.7%和24.3%。综合考虑土壤中La的去除效果和成本,选择柠檬酸作为最佳淋洗剂。Effects of tartaric acid,citric acid and malic acid removing lanthanum（ La） from polluted soils,relative to concentration of the leachate,duration of leaching and soil p H were investigated through a leaching experiment. Results show that in the vibrating leaching experiment constant in condition（ 25 ℃ and 200 r·min-1）,La removal increased with rising concentration of any one of the three organic acids,increased and then leveled off with the experiment going on and rose and fell with rising soil p H. It was found that for the three organic acids,the optimal concentration,leaching time and p H was 0. 01 g·m L-1,4 h and 5. 0,respectively,in the experiment of removing La. Under such conditions,La removal rate of tartaric acid,citric acid and malic acid reached 57. 13%,62. 32% and 54. 86%,respectively,in the soil being300 mg·kg-1in La concentration,74. 39%,77. 94% and 72. 75%,respectively,in the soil being 2 500 mg·kg-1in La concentration,and 17. 8%,23. 7% and 24. 3%,respectively,in the soil being 463. 6 mg·kg-1in La concentration in a mine area. Taking into account comprehensively La removing efficiency and cost,citric acid should be cited as the optimal leaching agent.

关 键 词：污染土壤 有机酸 镧(La) 淋洗 效率 

分 类 号：X53[环境科学与工程—环境工程]