期刊论文

Supernormal Enrichment Behavior of Cadmium and its Environmental Impact Assessment in Soil Profile of Karet Area in Western Hunan

中文

南华大学学报(自然科学版)

1673-0062

2022

36

01

58-65+96

10.19431/j.cnki.1673-0062.2022.01.009

湖南省自然科学基金资助项目（2020JJ4524）；

本校为第一机构

选择湘西永顺县王村镇一条白云岩发育的土壤剖面（WC）,通过对剖面中Cd的地球化学特征研究，结合质量平衡计算、基岩动态淋溶实验以及土壤层活性态Cd的提取，获得了以下主要认识。1)贫Cd碳酸盐岩（0.095 mg/kg）的酸不溶相中，Cd显著富集（2.12 mg/kg）,质量分数是其在基岩中的22倍；另一方面，基岩中80%以上的Cd赋存在碳酸盐相。因此，碳酸盐岩风化成土过程中，Cd呈现出低背景、强亏损、高富集的特征。2)Cd在WC剖面紧挨岩-土界面土层的超常富集（13.24 mg/kg）,可能主要源于岩-土界面作用中残余的富Cd酸不溶物基础上，叠加了从土壤层长期演化中进一步淋滤下渗的Cd。3)土壤层中Cd的质量分数不仅...

A soil profile developed on dolostone,in Wangcun town,Yongshun county,Western Hunan,namely Wangcun profile(WC)was taken as the research target.Through the study on geochemical characteristics of cadmium(Cd)in the profile,combining with mass balance calculation,bedrock dynamic leaching experiment and the extraction of mobile Cd in the soil layer,the main understandings were obtained as follows.(1)Cd is significantly enriched in acid-insoluble phase(2.12 mg/kg)in carbonate bedrock poor in Cd(0.095 mg/kg),and its concentration in the former is 22 times higher than that in the latter.On the other ...