呼和浩特盆地西部饮用水砷含量分析及其富砷因素探讨

本文从环境卫生、永文地质及地貌特征阐明呼和浩特盆地西部饮用水砷含量分布规律,并就地下水富砷因素作了探讨。结果表明,冲湖积平原浅层井水砷含量<0.01～1.86mg/L。超标率22.99％(我国卫生标准为0.05mg/L),最高水砷含量超标36倍,分布不均匀呈局灶状。深层水砷含量<0.01～0.36mg/L,超标率64.29％,分布呈连续性、范围广约1000km~2,此外,具有脱硫酸和甲烷形成作用。冲洪积平原地下水、哈素海及地表渠系水砷含量均不超标。结果提示,呼和浩特盆地西部富含高砷地下水具有地球化学特性。改水降砷集中供水可选用黄河渠系水。

Arsenic Content Analysed and Rich Arsenic Factors Studied in Drinking Water of the West Area in Huhhot Easin

The Paper explains the distributing regular pattern about arsenic Content in the water of Zhijiliang township and other 14 townships on the west area in Huhhot Basin,according to the features of environmental hygiene,hydrogeology and relief and studies the rich arsenic factors in the grou-ndwaier.The results show that the arsenic content is<0.01~1.86mg/L in the shallow groundwater of the alluvial and lake plain;the rate of exceeding the standard(0.05mg/L)is 22.99%;the highest arsenic content in the water exceeds the standard 36 times.The distributions of the arsenic content present noncontinous and limited.The results also show that the arsenic content is<0.01~ 0.36mg/L in the deep groundwater;the rate of exceeding standard is 64.29%;the arsenic Contents of the water present continuous and wide(about 1000km2).The deep groundwater haves an action of desulphuric acid and forming CH4.The arsenic content dose not exceed the standard in the groundwater and surface water on the alluvial and pluvial plain.The results suggest that the rich arsenic water in the west area of Huhhot Basin haves a characteristic of geochemistry and we can select the water in Yellow River as the drinking water in the area.