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关于饮用水中致癌物质可能为人的癌症致病原因的研究比较少。有的研究证明河水和城市经处理过的水中有化学致癌物质,还有的证明在氯处理时产生致癌物质。但问题是这些物质在水中的浓度一般都很低(在ppb数量级),这样的水平对于癌症发病率的影响是否可以检查出来。为此作者利用路易斯安那州的一些资料进行了回归分析。利用这些资料的原因为:(1)怀疑到新奥尔良市(在密西西比河沿岸)膀胱癌发病率高可能与饮用水有关;(2)在密西西比河水中检查出有些致癌物质;(3)密西西比河水与路易斯安那州其他水源水在质量上的差别。
There is relatively little research on the causative agent of cancers that cause cancer in drinking water. Some studies have shown that there are chemical carcinogens in water treated in rivers and cities, and some have proven carcinogens when treated with chlorine. The problem is that these substances are generally low in water (on the order of ppb), and the effect of such levels on the incidence of cancer can be checked out. For this reason the author uses some data from Louisiana to carry on the regression analysis. The reasons for using these data are: (1) the suspicion that the high incidence of bladder cancer to New Orleans (along the Mississippi River) may be related to drinking water; (2) the detection of some carcinogens in the Mississippi River; (3) the Mississippi River water Differences in quality from other sources of water in Louisiana.