摘要
以山西省运城市垣曲县历山镇大骨节病病区为研究区,在对研究区病区与非病区水土样品进行科学采集和硒含量水平准确测定的基础上,开展了土壤中硒赋存形态的连续化学浸提试验,研究了研究区病区与非病区土壤中7种硒赋存形态的分布特征,并利用等温吸附试验和吸附动力学试验,研究了研究区病区与非病区土壤/含水介质对硒的吸附特征。结果表明:研究区病区与非病区土壤/含水介质中总硒的含量水平基本相当;但与非病区相比较,研究区病区地下水饮用水源中总硒含量水平均偏低;研究区病区土壤中易溶态硒(水溶态硒和可交换态硒)平均含量低于非病区土壤;研究区病区土壤/含水介质对硒的吸附等温线符合Freundlich方程,吸附动力学为准二级动力学模型;研究区病区土壤/含水介质中较低的易溶态硒含量及其对硒具有较强的吸附能力是导致该地区地下水饮用水源中硒含量低的主要原因之一。
This paper chooses the Kaschin-Beck disease（KBD）area of Lishan Town,Yuncheng County,Shanxi Province as the study area.First,the paper carries out the continuous chemical extraction experiment of soil selenium,based on the scientific collection of soil and water samples and the accurate determination of selenium content in both endemic and non-endemic areas.Then the paper studies the distribution characteristics of seven forms of selenium（soluble,exchangeable,organic,elemental,carbonate,sulfidebound and residual）in the soil.And the paper also carries out the adsorption experiments to study the adsorption characteristics of selenium in soil/aqueous medium.The results show that the content of total selenium in soil/aqueous medium in endemic areas is similar to that in non-endemic area.However,the total selenium content in groundwater is lower in endemic areas than that in non-endemic areas,and is partly lower than the detection limit.As for the occurrence form of soil selenium,the average content of soluble selenium in soil in endemic areas is lower than that in non-endemic areas.The adsorption isotherm of selenium in soil/aqueous medium in the study areas is in accordance with the Freundlich equation,and the adsorption kinetics is the quasi two level dynamic model.The possible reasons for the low selenium content in the drinking water source are the low water soluble selenium content in the soil/aqueous medium and the strong adsorption capacity of the soil/aqueous medium.
作者
张鑫
李敏敏
高旭波
ZHANG Xin;LI Minmin;GAO Xubo(School of Environmental Studies,China University of Geosciences（Wuhan）,Wuhan 430074,Chin)
出处
《安全与环境工程》
CAS
北大核心
2018年第4期1-7,共7页
Safety and Environmental Engineering
基金
国家自然科学基金项目(41372251
41521001)
高等学校博士学科点专项科研基金项目(20130145120014)
湖北省自然科学基金项目(2013CFB410)
关键词
大骨节病
水-土体系
硒元素
赋存形态
动力学吸附
等温吸附
Kashin Beck disease （KBD）
water sediment system
selenium
speciation
adsorption kinetics
isothermal adsorption
