山西山阴、应县一带砷中毒区砷的环境地球化学研究

通过对山西省大同盆地砷中毒区的环境地球化学调查，对病区环境中砷的来源、价态及砷的迁移、富集、转化规律进行了研究。结果表明，盆地周边岩石、煤系地层为富砷岩系，构成砷的原生物源。自然和人为作用将环境中的砷释放出来，在第四系含水层湖冲积物中富集成次生富砷储集层，为水砷的直接来源。由于含砷水在黄水河构造凹地的深层滞留，加之干旱蒸发使水中砷进一步浓集成高砷水，富炭质含水层的还原环境促使Ａｓ５＋向Ａｓ３＋转化，提高了水的毒性，加剧了砷中毒的发生。

ENVIRONMENTAL GEOCHEMICAL STUDY ON ARSENIC IN ARSENIASIS AREAS IN SHANYIN AND YINGXIAN, SHANXI PROVINCE

n environmental geochemical investigation has been made in the arseniasis areas of the Datong basin, Shanxi Province, on the source of anomalous arsenic, the state of its chemical valency, the characteristic of its migration, enrichment and transformation. The study indicates that the arsenic rich rocks around the basin and coal series strata are the original arsenic sources. Released by activities of nature and mankind, the arsenic concentrated in water bearing horizon of Quaternary constitutes the direct arsenic sources in water. Owing to dry climate, the arsenic bearing water detained in structural depression was evaporated and concentrated into high arsenic water. The reduction environment of rich coal aquifer benefits the transformation of As 5 to As 3 so that the water is more poisonous and, as a result, the arseniasis occurred more violently.