DTPA和CaCl_(2)浸提方法下土壤中重金属提取效率比较研究  

Comparative study on extraction efficiency of heavy metals in soil by DTPA and CaCl _(2) extraction methods

作　　者：曹磊[1,2] 张琦 Cao Lei;Zhang Qi(Geological Survey of Jiangsu Province,Nanjing 210018,China;Technical Innovation Center of Land(Cultivated Land)Ecological Monitoring and Restoration Engineering of Ministry of Natural Resources,Nanjing 210018,China)

机构地区：[1]江苏省地质调查研究院,江苏南京210018 [2]自然资源部国土(耕地)生态监测与修复工程技术创新中心,江苏南京210018

出　　处：《江苏科技信息》2022年第27期70-74,共5页Jiangsu Science and Technology Information

基　　金：国家重点研发计划项目,项目名称:国家质量基础的共性技术研究与应用重点专项,项目编号:2016YFF0201103;自然资源部国土(耕地)生态监测与修复工程技术创新中心开放课题,项目名称:土壤-水体系中典型重金属元素原位监测技术研究,项目编号:GTST2021-010。

摘　　要：文章对江苏省地区重金属含量较高的5个碱性土壤和5个酸性土壤中的8个重金属元素进行了DTPA浸提和CaCl_(2)浸提试验。无论是在酸性土壤还是碱性土壤中,As,Cr和Hg这3个元素在两种浸提方法下的浸提效率都很低,基本均在0.5%以下,其中Hg的实际浸出含量几乎可忽略不计。Cd,Cu,Ni,Pb和Zn这5个元素总体来说,无论是在酸性土壤还是碱性土壤中,DTPA浸提效率都高于CaCl_(2)浸提效率。其中,酸性土壤中的Cd元素,在两种浸提方法下的浸提率均高于其他几个重金属元素,最容易被浸提出来。土壤的酸碱性和元素本身在土壤中的赋存形式对元素在不同浸提溶液下的提取效率有很大影响。In this paper,DTPA extraction and CaCl_(2)extraction experiments were carried out on eight heavy metal elements in five alkaline soils and five acidic soils with high heavy metal content in Jiangsu province.No matter in acidic soil or alkaline soil,the extraction efficiency of As,Cr and Hg under the two extraction methods is very low,nearly all below 0.5%,and the actual leaching content of Hg is almost negligible.In general,the extraction efficiency of Cd,Cu,Ni,Pb and Zn by DTPA is higher than that by CaCl_(2)in both acidic and alkaline soils.Among them,the extraction rate of Cd element in acidic soil under the two extraction methods is higher than that of other heavy metal elements,and it is most easily extracted.The acidity and alkalinity of soil and the occurrence form of elements in soil have great influence on the extraction efficiency of elements in different extraction solutions.

关 键 词：DTPA CaCl^(2) 土壤中重金属 浸提效率 

分 类 号：U4-9[交通运输工程—道路与铁道工程]