赣杭构造带某铀矿区地下水中铀的存在形式研究北大核心CSCD

为研究铀矿区地下水化学性质对铀的存在形式的影响,本文以赣杭构造带某铀矿区地下水为研究对象,在对9个典型采样点地下水化学成分分析的基础上,采用数理统计软件SPSS 18.0和地球化学模拟软件PHREEQC及llnl.dat数据库,探究了研究区内地下水水化学特征及U的存在形式。结果表明:本研究区地下水水化学类型以HCO_(3)-Na与HCO_(3)-Na·Ca为主,U含量与Ca^(2+)和Mg^(2+)浓度体现出较强正相关性,与SO_(4)^(2-)的相关性次之;地下水中U元素主要以六价为主,几乎占100%,主要存在形式依次为UO_(2)(CO_(3))_(2)^(2-)、UO_(2)(CO_(3))_(3)^(4-)、UO_(2)CO_(3)、UO_(2)(OH)2、UO_(2)(OH)_(3)^(-)、UO_(2)OH^(+)等6种,其中UO_(2)(CO_(3))_(2)^(2-)占绝对优势,整体以碳酸铀酰形式为主,这也与研究区地下水酸碱性相对应。

Study on the uranium existing form in groundwater of a uranium mining area along the Gan-Hang tectonic belt

To study the influence of hydrochemical properties of groundwater on the existing forms of uranium in uranium mining areas based on the analysis of chemical composition of groundwater,the mathematical statistics software SPSS 18.0 and the numerical simulation software PHREEQC with LLNL database were used to simulate and explore the groundwater hydrochemical characteristics and the existing forms of Uranium in groundwater throughout a uranium mining area along the Gan-Hang Tectonic belt.The results show that the hydrochemical types are mainly HCO₃-Na and HCO₃-Na·Ca,Uranium was positively correlated with Ca²⁺ and Mg²⁺ ,and moderately correlated with SO₄^2-.Aqueous Uranium in groundwater is mainly hexavalent,accounting for almost 100%.The existing forms of Uranium are mainly UO₂(CO₃)₂^2-,UO₂(CO₃)₃^4-,UO₂CO₃,UO₂(OH)2,UO₂(OH)₃^- and UO₂OH⁺.Among them,UO₂(CO₃)₂^2-accounts for the absolute majority,followed by UO₂(CO₃)₃^4-,UO₂CO₃ and UO₂(OH)₂,and the total is mainly of a uranyl carbonate form,which corresponds to the acid-base property of groundwater in the studied area.