论文部分内容阅读
原生高砷地下水在全球分布广、危害大,严重威胁着全世界数亿人口的身体健康.为科学指导高砷地区地下水资源的合理开发利用,以中国大陆第一个砷中毒病区新疆奎屯为研究区域,分析了奎屯地区高砷地下水的分布规律、类型及成因.结果表明,奎屯地区有88.7%的地下水中砷浓度超出10μg·L~(-1),多为高砷地下水.高砷地下水多分布在深层承压含水层,砷浓度从南向北逐渐升高,与采样点海拔高度呈显著负相关.奎屯地区地下水整体呈弱碱性、碱性环境,氧化还原电位(Eh)均为负值,具有较强的还原性,属于还原性-弱碱性高砷地下水(I-2型).奎屯南面的天山与北面的河流沉积平原环境相结合,为该区地下水形成高砷提供了有利的地质环境.奎屯地区沉积层深厚,地下径流更替缓慢,相对封闭的水文地质条件使地下水中的砷富集而不易流失,强烈的蒸发可以使地下水中的砷进一步浓缩.同时,地下水的还原条件有利于含水层中砷的释放,砷浓度不仅受铁锰氧化物矿物还原的影响,而且受SO2-4还原和硫化物矿物沉淀的控制,吸附态砷的解吸附也是该地区地下水的富砷过程.
The native high arsenic groundwater is widely distributed in the world and endangering the disease seriously, which seriously threatens the health of hundreds of millions of people in the world.In order to guide the rational exploitation and utilization of groundwater resources in high-arsenic area, taking the first arsenic poisoning disease in Kuitun, Xinjiang The research area, the distribution regularity, type and genesis of high-arsenic groundwater in Kuitun area were analyzed.The results showed that 88.7% of groundwater in Kuitun area had arsenic concentration exceeding 10μg · L -1, mostly high arsenic groundwater, high arsenic groundwater The distribution of arsenic in the confined aquifer was mostly in the confined aquifer, and the arsenic concentration increased gradually from south to north, which was negatively correlated with the altitude of the sampling point.The groundwater in the Kuitun area was weak alkaline and alkaline environment, and the redox potential (Eh) Negative, and highly reducible, belonging to the reductive - weak alkaline arsenic groundwater (type I-2). The combination of the Tianshan Mountains in the south of Kuitun and the river sedimentary plain in the north provides the groundwater with high arsenic Favorable geological environment.The Kuytun area has a deep sedimentary layer and a slow underground flow replacement. Relatively closed hydrogeological conditions make arsenic in groundwater rich and difficult to evaporate. Strong evaporation can lead to arsenic in groundwater Concentration.At the same time, the groundwater reduction conditions are conducive to the release of arsenic in the aquifer, the arsenic concentration is not only affected by the reduction of Fe-Mn oxide minerals, but also by SO2-4 reduction and sulfide mineral precipitation control, desorption of adsorbed arsenic It is also arsenic-rich process of groundwater in the area.