城市土壤铜有效性提取方法的比较  

Effect of the Amendments on Extraction Methods of Effective Cu in Urban Soils

作　　者：梁晶[1] 章菁熠[1,2] 方海兰[1] 郝冠军[1] 

机构地区：[1]上海市园林科学研究所,上海200232 [2]南京农业大学资源与环境学院,江苏南京210095

出　　处：《环境科学与技术》2014年第11期72-78,85,共8页Environmental Science & Technology

基　　金：上海辰山植物园专项(G102402);上海市人才发展基金(2009044)

摘　　要：以自制的不同Cu污染程度的2种土壤A和B为研究对象,通过添加不同量供试改良材料绿化植物废弃物和草炭模拟城市土壤改良,研究了Tessier连续提取法、碳酸氢铵-二乙三胺五乙酸(AB-DTPA)浸提法和氯化钙-三乙醇胺-二乙三胺五乙酸浸提法(DTPA)对不同处理有效Cu的提取效果。结果表明,改良材料及改良材料添加量相同时,AB-DTPA和DTPA浸提法对污染程度低的土壤A中铜提取率高于铜污染程度高的土壤B;AB-DTPA和DTPA浸提法提取的Cu与Tessier法测得的土壤易被生物利用态Cu(交换态Cu+碳酸盐结合态Cu或交换态Cu+碳酸盐结合态Cu+铁锰氧化物结合态Cu)和可被生物利用态Cu(交换态Cu+碳酸盐结合态Cu+铁锰氧化物结合态Cu+有机结合态Cu)呈极显著正相关关系;AB-DTPA浸提法铜提取能力高于DTPA浸提法,AB-DTPA浸提法是一种更能评价城市土壤Cu潜在危害的方法。The effects of Tessier method, AB-DTPA and DTPA on extraction of effective Cu were studied in Cu contaminated soils, which were amended by adding different greenery wastes and peats. Results showed that the ratio of ABDTPA and DTPA extraction Cu were higher in soil sample I with lower Cu content than soil sample Ⅱ with higher Cu content, when the amendments added were the same. And there are a significant positive correlation between AB-DTPA and DTPA extraction Cu and readily bioavailable Cu（exchangeable ＋ carbonate-bound or exchangeable ＋ carbonate-bound ＋iron-manganese oxide bound） and bioavailable Cu（exchangeable ＋ carbonate-bound ＋ iron-manganese oxide bound ＋residual state） of Tessier extraction. Furthermore, AB-DTPA extraction Cu was higher than DTPA, and AB-DTPA extraction method may better evaluate the potential hazards of Cu in urban soils.

关 键 词：铜污染土壤 碳酸氢铵-二乙三胺五乙酸 氯化钙 三乙醇胺 Tessier法 

分 类 号：X131[环境科学与工程—环境科学]