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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. 該井水含砷濃度爲0.;6mg/L;是我國生活飲用水中最高容許濃度的15倍。 該廠地方性慢性砷中毒的患病率是44