浙江典型富硒区硒与重金属的形态分析  

Chemical Species of Heavy Metals and Selenium in Representative Se-rich Area,Zhejiang Province

作　　者：宋明义[1,2] 冯雪外[3] 周涛发[1] 郑文 黄春雷 简中华 蔡子华 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009 [2]浙江省地质调查院,浙江杭州311203 [3]龙游县国土资源局,浙江龙游324400

出　　处：《现代地质》2008年第6期960-965,979,共7页Geoscience

基　　金：中国地质调查局地质大调查项目(200214200013)

摘　　要：通过对浙江西部龙游地区富硒土壤中Hg、Cd、Pb、As等重金属含量的研究表明,成土母岩中与硒伴生的重金属含量较高,由于特殊的地形地貌、母岩风化物质搬运条件以及有利的土壤理化性质等,土壤中重金属大为减少。异常地段重金属形态分析结果表明:土壤中仅有Cd的全量、离子交换态、碳酸盐结合态和弱有机态较高,分别为0.6mg/kg、22.1%、26.5%、11.4%;Se全量平均为0.89 mg/kg,离子交换态、弱有机态含量分别为1.12%、26.4%,碳酸盐结合态仅为0.62%。尽管如此,区内莲子、稻米等农产品仍表现出高硒低重金属等特点,居民健康长寿,发硒含量高,从而为龙游县开发富硒农产品提供了有利条件。A study on contents of heavy metals in the representative selenium-rich soil was carried out. The results show that contents of Se and heavy metals in parent rock are higher than those in other rock series. However, thanks to special landform, transport conditions, and advantageous physical and chemical quality of soil, the contents of heavy metals are much lower in soil than in its parent rocks. In this work, specia- tion and fractionation of heavy metals were studied using sequence extraction procedure in the abnormity plot. The results indicate that aside from Cd, the contents of heavy metals are low. The content, exchangeable, carbonate-bound and loose organic-bound species of Cd, follow the order of 0.6 mg/kg, 22. 1% , 26.5% , 11.4%, and the content, exchangeable, loose organic-bound and carbonate-bound species of Se are 0. 89 mg/kg, 1.12% , 26.4% and 0. 62% , respectively. Based on the result of the research, we find that the con- tent of selenium is much higher and contents of heavy metals are low both in human hair and farm-products in study areas, such as lotus seed, rice, etc. Moreover, the residents are health and longevity. From this study, we are looking forward to developing some new farm-products which are abundant with selenium in Longyou County, Zhejiang Province.

关 键 词：富硒区 环境地球化学 重金属 生物有效性 浙江龙游 

分 类 号：P595[天文地球—地球化学] X142[天文地球—地质学]