两种钝化剂对土壤Pb、Cd、As复合污染的菜地修复效果  

Effects of Two Amendments on Remedying Garden Soil Complexly Contaminated with Pb,Cd and As

作　　者：田桃[1] 雷鸣[1] 周航[1] 杨文弢 廖柏寒[1] 胡立琼[1] 曾敏[1] 

机构地区：[1]中南林业科技大学环境科学与工程学院,长沙410004

出　　处：《环境科学》2017年第6期2553-2560,共8页Environmental Science

基　　金：农业部财政部科研专项(农办财函2016);国家自然科学基金项目(41501344);湖南省重点学科建设项目(2006180)

摘　　要：通过辣椒种植田间试验,研究了硫酸铁和碳酸钙对土壤Pb、Cd和As复合污染的生物有效性以及对辣椒中Pb、Cd、As迁移与累积的影响.结果表明:(1)硫酸铁和碳酸钙都能显著降低土壤中Pb、Cd的TCLP提取态含量,使土壤中As的TCLP提取态含量显著升高.(2)硫酸铁使辣椒果实中Pb和Cd含量分别降低7.2%~22.9%和2.3%~2.9%,而对As含量没有影响;碳酸钙使辣椒果实中Pb、Cd、As的含量分别降低15.8%~16.3%、11.8%~15.0%、0.03%~53.2%.(3)硫酸铁使辣椒茎到果实中Pb、Cd、As的转运系数分别最大降低16.7%、68.0%、10.2%;碳酸钙使辣椒茎到果实中Pb、Cd、As的转运系数分别最大降低16.7%、51.5%、45.6%.硫酸铁和碳酸钙都能有效降低旱地中Pb、Cd、As向辣椒中迁移,且碳酸钙效果比硫酸铁好.This paper studied the effects of two amendments （iron sulfate[Fe2 （SO4）3] and calcium carbonate[CaCO3]） on the bioavailability of Pb, Cd and As in a garden soil and on the migration and accumulation of Pb, Cd and As in pepper through an in-situ experiment planting pepper plants. The results indicated that：①Addition of these amendments significantly decreased TCLP extractable contents of Pb and Cd in soil, and increased TCLP extractable contents of As.②Compared with the control group, addition of Fe2 （SO4）3 led to reduction in contents of Pb and Cd in pepper fruits by 7.2%-22.9% and 2.3%-2.9%, respectively, but no obvious changes were observed for As contents in pepper fruits. Meanwhile, addition of CaCO3 decreased the contents of Pb, Cd and As in pepper fruits by 15.8%-16.3%, 11.8%-15.0%, and 0.03%-53.2%, respectively. ③The maximum reductions for the translocation factors of Pb, Cd and As from stem to fruits in pepper plants were 16.7%, 68.0%, 10.2%, respectively, due to Fe2（SO4）3 application and 16.7%, 51.5%, 45.6%, respectively, due to CaCO3 application, compared with the control group. It was obvious that Fe2 （SO4）3 and CaCO3 could both effectively decrease the migration of soil Pb, Cd and As to pepper plants, but the effects of CaCO3 were better than those of Fe2 （SO4）3.

关 键 词：钝化剂 蔬菜土壤 Pb、Cd、As复合污染 辣椒 转运系数 

分 类 号：X171.1[环境科学与工程—环境科学] X53