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自然界水环境污染日趋严重,尤其是大城市附近的地面水污染更重,导致自来水中有机化学物含量明显增加,致突变、致癌性也增加,对人类健康存在潜在的危险。上海市区消化道恶性肿瘤(尤其是结肠癌和直肠癌)的发病率在最近几年上升很快,据上海市肿瘤登记处的资料,1991年消化道肿瘤胃、肝、结肠、食管、直肠癌的发病率列男性恶性肿瘤发病率的第二、三、四、五、六位;列女性恶性肿瘤发病率的第二、
Water pollution in nature is becoming more and more serious. Especially in the vicinity of big cities, groundwater pollution is heavier. As a result, the content of organic chemicals in tap water is significantly increased, mutagenicity and carcinogenicity are also increased, posing potential dangers to human health. The incidence of gastrointestinal malignancies (especially colon and rectal cancers) in Shanghai has risen rapidly in recent years. According to the Shanghai Tumor Registry, the gastrointestinal tumors of stomach, liver, colon, esophagus and rectum The incidence of cancer was listed in the second, third, fourth, fifth and sixth of the incidence of male malignant tumors; the incidence of malignant tumors in the second,