摘要
以北方碱性褐土有效镉提取方法筛选为研究内容,在褐土分布区南北纵向300 km范围内,采集32套小麦和根系土样品,分析总镉含量。同时,对根系土采用0.43 mol/L硝酸溶液、1 mol/L盐酸溶液、0.1 mol/L盐酸溶液、0.001 mol/L盐酸溶液、DTPA(1∶2)浸提剂、DTPA(1∶5)浸提剂、DTPA+NaNO_(3)浸提剂、0.01 mol/L氯化钙、0.1 mol/L氯化钙等9种提取方法进行单提取实验。通过回归模型预测的小麦镉含量与实测含量之间的相对偏差合格率、小麦镉超标判断准确率、小麦镉含量与提取量相关系数、提取系数大小及稳定性等综合因素判断,DTPA(1∶2)浸提剂法是北方碱性褐土条件下最适宜的有效镉提取方法。本文研究结果在农用地土壤镉污染程度评价、镉污染风险评估、镉污染修复方案制定等方面均具有重要意义。
This study aims to screen the best method of the available cadmium extracted from alkaline cinnamon soil in northern China,with 32 sets of coupled samples of wheat grain and root soil been collected in the cinnamon soil distribution area along a 300 kilometers range from the north to south and been analyzed for the total cadmium content. At the same time,single extraction experiment was carried out on the root soil through 9 different extraction methods with 0. 43 mol/L nitric acid solution,1 mol/L hydrochloric acid solution,0. 1 mol/L hydrochloric acid solution,0. 001 mol/L hydrochloric acid solution,DTPA( 1 ∶2) extractant,DTPA( 1 ∶5) extractant,DTPA+ NaNO_(3) extractant,0. 01 mol/L calcium chloride,and 0. 1 mol/L calcium chloride. Based on comprehensive factors such as the relative deviation between the model predicted wheat grain cadmium content and the measured content,the accuracy of predicated wheat grain cadmium content that excess the food standard,the correlation coefficient between wheat grain cadmium content and the soil extraction amount,the sizes and stability of the extraction coefficients,DTPA( 1 ∶2) extraction method is the most suitable available cadmium extraction method under the condition of alkaline cinnamon soil in northern China. The research results of this study are of great significance in the evaluation of cadmium pollution degree in agricultural soils,the risk assessment of cadmium pollution,and the formulation of cadmium pollution remediation programs.
作者
张秀芝
王立平
刘伟彬
陈庆芝
谢伟明
金倩
ZHANG Xiuzhi;WANG Liping;LIU Weibin;CHEN Qingzhi;XIE Weiming;JIN Qian(Hebei Institute of Geological Survey,Shijiazhuang 050051,China;Hebei Research Center for Geoanalysis,Hebei Baoding 071000,China;Key laboratory of Mineral Resources and Ecological Environment Monitoring of Hebei Provinee,Hebei Baoding 071000,China)
出处
《地球与环境》
CAS
CSCD
北大核心
2021年第2期207-215,共9页
Earth and Environment
