外源腐殖酸对黏质农田土壤Cd活性的影响  

Influence of Exogenous Humic Acid on Heavy Metal Cd Activity in Clayey Farmland Soil

作　　者：张笛梦 胡艳平[1] 王振华[1] 李青云[1] 李冠亚 ZHANG Di-meng;HU Yan-ping;WANG Zhen-hua;LI Qing-yun;LI Guan-ya(Basin Water Environment Research Department,Yangtze River Scientific Research Institute,Wuhan 430010,China)

机构地区：[1]长江科学院流域水环境研究所,武汉430010

出　　处：《长江科学院院报》2020年第2期68-71,共4页Journal of Changjiang River Scientific Research Institute

基　　金：湖北省技术创新专项重大项目(2017ABA073);水利部公益性行业科研专项(201501019)。

摘　　要：为探讨外源腐殖酸对黏质农田土壤Cd活性的影响,选取2种典型腐殖酸,采用淋洗技术,通过测定农田土壤总Cd、DTPA-Cd、MgCl 2-Cd的含量,研究了2种腐殖酸及其淋洗时间对土壤Cd活性的影响。研究结果表明:2种腐殖酸处理后,土壤总Cd含量基本不变,土壤DTPA-Cd含量从0.421 mg/kg降低到0.313 mg/kg,MgCl 2-Cd含量从0.2 mg/kg降低到0.169 mg/kg;淋洗时间从1 d增加到5 d,土壤总Cd含量基本不变,土壤DTPA-Cd含量从0.325 mg/kg降低到0.265 mg/kg,MgCl 2-Cd含量从0.196 mg/kg降低到0.165 mg/kg。因此,2种腐殖酸均对黏质农田土壤镉有一定的去除效果。The effects of two different extrogenous humic acids on the activity of Cd in clayey farmland were examined by measuring the content of total Cd,DTPA-Cd and MgCl 2-Cd after leaching treatment.After two humic acid treatments,the total content of Cd content in the soil remained unchanged in general,the content of DTPA-Cd decreased from 0.421 mg/kg to 0.313 mg/kg,and the content of MgCl 2-Cd declined from 0.2 mg/kg to 0.169 mg/kg.When leaching time increased from 1 day to 5 days,the total content of Cd also remained unchanged overall,DTPA-Cd decreased from 0.325 mg/kg to 0.265 mg/kg,and MgCl 2-Cd reduced from 0.196 mg/kg to 0.165 mg/kg.In conclusion,both the exogenous humic acids could remove Cd in the soil of clayey farmland.

关 键 词：农田土壤 腐殖酸 淋洗技术 总Cd含量 DTPA-Cd MgCl2-Cd 

分 类 号：X53[环境科学与工程—环境工程]