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地理学报  2014 

西藏地区天然水的水化学性质和元素特征

DOI: 10.11821/dlxb201407009, PP. 969-982

Keywords: 西藏,水化学性质,区域水质对比,水中元素特征

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Abstract:

为了调查西藏的水质和水资源特色,2013年在西藏拉萨、那曲地区、阿里地区、日喀则地区36个县乡镇采集了60个水样(地下水35个,地表水22个,温泉水3个),对其水化学性质与元素含量进行分析测定,并与周边的青海西南部、新疆南部、四川西部与西藏东部等地水的水化学类型进行了对比,讨论了不同地区内水化学类型的差异。总体上看西藏大部地区水质较好,能够满足国家生活饮用水卫生标准。水样pH处于6.75~8.21范围内;总溶解性固体(TDS)均值为225.54mg/L;阿里地区水中砷元素含量超标(超过10μg/L),双湖地区水中氟含量超标(超过1mg/L);水化学类型主要为Ca-HCO3型;由南向北水中阳离子由以Ca2+为主逐渐过渡到以Na+为主,阴离子HCO3-逐渐减少,Cl-与SO42-逐渐增多;河流水与冰川融水的成因类型主要为岩石风化型,地下水成因受多种因素控制;构造分区控制水中主要元素进而影响水化学类型。

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