The arsenic concentration of this well water was 0.6rag/L, which was 15 times as great as the maximal permissible concentration of drinking water, In the plant the morbidity of endemic chronic arseni cism was 44.6 percent.

• 该井水含砷浓度为0.；6mg/L；是我国生活饮用水中最高容许浓度的15倍。 该厂地方性慢性砷中毒的患病率是44