芜湖燃煤电厂周边土壤中砷汞的分布特征研究  

Distribution of Arsenic and Mercury in Soil Around Coal-fired Power Plant in Wuhu

作　　者：方凤满[1,2] 杨丁[3] 汪琳琳[1] 蒋炳言[1] 

机构地区：[1]安徽师范大学国土资源与旅游学院,安徽芜湖241003 [2]安徽自然灾害过程与防控研究省级实验室,安徽芜湖241003 [3]合肥市第四十五中学,合肥230031

出　　处：《水土保持学报》2010年第1期109-113,共5页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(40901258);安徽高校省级自然科学研究重点项目(KJ2009A137)

摘　　要：探讨了芜湖燃煤电厂周边随距电厂水平方向、垂直剖面土壤中砷汞总量及形态分布特征,并分析了土壤中砷汞与理化性质之间的相关性。结果表明:土壤中As、Hg的变幅分别为3.821～19.264mg/kg,0.025～1.696mg/kg,平均含量分别为6.671mg/kg和0.212mg/kg。As、Hg含量总体分布特征为:距电厂1km处最大,距电厂1km距离内次之,距电厂1km以外,随距离增大而减小,其中汞随距离衰减明显。土壤汞含量在东南-西北(SE-NW)主导风向上明显大于东北-西南(NE-SW)非主导风向,而As含量在不同风向上基本无差异;土壤汞含量随剖面深度的增加明显减少,而砷在剖面上的分布规律不明显。土壤中砷主要以硫化物态和残渣态存在,而汞以残渣态和腐殖酸结合态为主。表层土中As、Hg与理化性质之间存在不同程度的相关性。This paper discussed As and Hg total concentrations and form distribution characteristics of soil in horizontal level and vertical section,along the coal-fired power plant in Wuhu,then analyzed the correlation between As,Hg and physicochemical characteristics of soil. Results showed：As concentrations in soil ranged from 3.821 to 19.264 mg/kg,with an average of 6.671 mg/kg; Hg concentrations in soil ranged from 0.025 to 1.696 mg/kg,with an average of 0.212 mg/kg. The overall distribution characteristics of As and Hg showed as the followings：distance of 1 km away from the plant〉within 1km〉the scope of 1-4 km away〉distance of 4 km away〉outside the scope of 4 km away from the plant.Hg had obvious decrease by the distance. Hg content in soil in the southeast-northeast （SE-NW） dominant wind direction was significantly greater than that in the northeast-southwest（NE-SW） non-dominant wind direction,while As content in different wind direction basically had no difference. Hg content in surrounding soils significantly increased with depth reducing,while vertical distribution pattern of As was not obvious. As in soil mainly existed as sulfide state and residue-bound,and Hg mainly existed as residue-bound and humics-bound. As,Hg concentrations in soil have different correlation with pH and total phosphorus（TP）,organic matter（OM） and total nitrogen（TN）.

关 键 词：土壤 砷汞 空间分布 形态分布 

分 类 号：X53[环境科学与工程—环境工程] S153[农业科学—土壤学]