呼和浩特盆地西部大面积富砷地下水水质检测分析

经对呼和浩特盆地西部深层水１０００ｋｍ￣２、浅层水６００ｋｍ￣２范围内进行水质检测分析，发现其深、浅两层地下水均富砷，浅水有１８．８％、深水有４０．９％的水样砷含量超过国家饮用水卫生标准。测得水体总砷中以三价砷为主。溶解氧含量低，铁、锰离子为痕量，硫酸盐、亚硝酸盐氮含量也均低，同时有低硒、高氟现象，提示该地区为富含有机质的强还原环境，有利于砷的迁移富集，对饮水型砷中毒起着促进作用。

Water quality analysis of arsenic enriched groundwater inIarge area of Western Huhehaote Basin.

The water quality of deep water in 1000square kilometers area and shallow water in 600 square kilo-meter area of western Huhehaote Basin was analyzed. The re-sults show that both deep water and shallow water are rich inarsenic. Arsenic content in1.8%of shallow water and 40.9%of deep water is higer than the National Sanitary Standard fordrinking water of China. Arsenic in the water exists mainly inthe form of arsenious state. The contents of dissolved oxygen,sulphate,nitrite and selenium are all lower. Some water sam-ples are high in fluoride.Iron ion and manganese ion are traceelements in the water. These phenomenons indicate that thereis the powerful reducing environment of rich organic substancein the area,in which arsenic is easily moved and accumulated.These are helpful in the occurrence of drinking water arsenicpoisoning case.