吉林西部砷中毒区高砷地下水反向地球化学模拟  

Inverse Geochemical Modeling of Arsenic Groundwater at Arseniasis Area in the Western of Jilin Province

作　　者：卞建民[1] 查恩爽[1] 汤洁[1] 马力[1,2] 陈刚[1,3] 

机构地区：[1]吉林大学环境与资源学院,长春130026 [2]吉林省地质环境监测总站,长春130021 [3]吉林省水务投资集团有限公司,长春130033

出　　处：《吉林大学学报（地球科学版）》2010年第5期1098-1103,共6页Journal of Jilin University：Earth Science Edition

基　　金：中国地质调查局国土资源调查项目(1212010634701);吉林省环保局项目(吉环科字第2008-16号)

摘　　要：为了解吉林西部砷中毒区高砷地下水水-岩作用过程及砷的迁移转化规律,通过野外调查、样品采集和数据测试,利用地下水化学测试数据,分析了该区地下水化学特征以及高砷地下水的水平和垂向分布规律。在地下水流场及水化学特征分析的基础上,应用PHREEQC软件进行了地下水砷的反向地球化学模拟,计算了沿同一水流路径下含砷、铁、锰等矿物的溶解或析出量。模拟结果表明:沿地下水流方向,含砷元素的矿物臭葱石在路径1和路径2上不同水样点间溶解进入地下水的量分别为2.44×10-6、8.03×10-7、7.98×10-6和4.14×10-7mmol/L,含铁、锰元素的矿物针铁矿、赤铁矿、软锰矿和方铁锰矿的质量交换结果均为正值;表明沿模拟路径这几种矿物发生溶解进入地下水,而硫酸根离子和CO2的交换量为负值,从地下水中析出。以上研究证实了地下水中砷与铁、锰元素具有良好的相关性,且高砷水在碱性的还原环境富集。In order to reveal the water-rock interaction process of high arsenic groundwater formation and transportation in the western of Jilin Province,field investigation,samples collection and data analysis had been finished.We used the experimental data to analyze the groundwater chemical features and high arsenic groundwater distribution in horizontal and vertical direction.By application to the PHREEQC,inverse modeling of the high arsenic groundwater was carried out.Based on the simulation,the minerals dissolution or resolution of arsenic,iron and manganese were calculated under different flow paths.The result shows that the deliquescent quantities into groundwater of both paths between different samples of scorodite mineral rich in arsenic are 2.44×10^-6,8.03×10^-7,7.98×10^-6 and 4.14×10^-7 mmol/L.The minerals rich in iron or manganese such as goethite,hematite,pyrolusite and bixbyite had been dissolved into groundwater,while the sulfate and carbon dioxide dissolved out,which revealed that arsenic is related to them and enriched in the alkaline and reduction environment.

关 键 词：地下水 高砷分布 反向地球化学模拟 吉林西部 

分 类 号：P641.3[天文地球—地质矿产勘探]