青藏高原西部狮泉河流域各环境介质中砷含量空间分布特征及成因机制探究  

Spatial distribution characteristics and genetic mechanism of arsenic content in various environmental medias in Shiquan river basin,western Qinghai-Tibet Plateau

作　　者：李青山 林光鑫 谢腾蛟 王丹 杨广焱 LI Qingshan;LIN Guangxin;XIE Tengjiao;WANG Dan;YANG Guangyan(Sichuan Tianshengyuan Environmental Service Co.,Ltd,Chengdu 610036;Sichuan Geological Engineering Survey Institute Group Co.,Ltd,Chengdu 610036;Chongzhou Center for Disease Control and Prevention,Chengdu 611200,China)

机构地区：[1]四川省天晟源环保股份有限公司,成都610036 [2]四川省地质工程勘察院集团有限公司,成都610036 [3]崇州市疾病预防控制中心,成都611200

出　　处：《干旱区资源与环境》2023年第9期99-108,共10页Journal of Arid Land Resources and Environment

基　　金：西南地区典型流域地表水-地下水砷异常成因调查技术研究(kyxm-2023-003)资助。

摘　　要：青藏高原西部的狮泉河是当地的主要水源,流域内各环境介质中高砷含量直接影响当地农牧业的发展和居民的生命健康。因此迫切需要查明流域砷含量分布规律及控制因素。通过系统地采集地表水、地下水、底泥、土壤及岩石样品,基于GIS空间分析、离子比例系数、Gibss图、NMDS分析、δ^(2)H与δ^(18)O同位素等研究方法的综合分析。结果表明:地表水砷含量0.5-333μg/L之间;底泥在3.8-363μg/g之间;土壤在4.7-106μg/g之间;地下水在2.3-76.7μg/L之间;热泉在1160-8920μg/L之间;岩石在0.31-93.4μg/g之间;地表水和地下水化学类型以HCO_(3)-Ca型为主,主要受岩石矿物化学风化过程控制;热泉水化学类型为HCO_(3)·Cl^(-)Na型,主要受深部地热影响;流域内的砷源主要来自于:1)含砷矿物的水-岩反应产物。2)汇入地表水的高砷热泉。The Shiquan river is the main water source in western Qinghai-Tibet Plateau.The high arsenic content in various environmental media in the basin directly affects the development of local agriculture and animal raising and the health of residents.Therefore,it is urgent to find out the distribution law and control factors of arsenic content in the basin.By systematically collecting surface water,groundwater,sediment,soil and rock samples,the CIS spatial analysis,ion ratio coefficient,Gibss diagram,NMDS analysis,δ^(2)H and δ^(18)O isotope analysis are used to probe the spatial characteristics and genetic mechanism of arsenic content in various environmental medias.The results show that the arsenic content is in range of 0.5-333μg/L in surface water,3.8-363μg/g in sediment,4.7-106μg/g in soil,2.3-76.7μg/L in groundwater,1160-8920μg/L in hot spring,0.31-93.4μg/g in rock.The chemical types of surface water and groundwater are mainly HCO_(3)-Ca,which is mainly controlled by the chemical weathering process of rock minerals.The chemical type of hot spring water is HCO_(3)·Cl^(-)Na,which is mainly affected by deep geothermal.The arsenic sources in the basin mainly come from water-rock reaction products of arsenic-containing minerals and hot spring containing high arsenic merging into surface water.

关 键 词：狮泉河流域 砷富集 水化学特征 水-岩反应 青藏高原 

分 类 号：X143[环境科学与工程—环境科学]