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[背景]以往铸铁饮用水水管的内部一直使用煤焦油和沥青涂层。多环芳香烃(PAHs)可从这些涂料浸出进入饮用水中,对人类健康形成潜在风险。[目的]评估铸铁水管涂层中PAHs潜在的人类致癌风险。[方法]在一项荷兰的全国性研究中,在17d的时间里、各种操作条件下(诸如无干扰操作、管道冲洗期间、管道维修之后)采集了120个地点的饮用水水样,并分析这些样本中的PAHs。然后评估终身暴露状况下的健康风险。[结果]在冲洗过程中,PAH水平经常超过饮用水水质标准;冲洗后,PAH水平迅速下降。铸铁水管修复后,在一些地点PAH水平超过饮用水标准长达40d。[结论]在所有120个测量点,通过饮用水途径的PAH暴露极限估值>10000,这表明通过饮用水途径的PAH暴露对消费者健康的影响较低。然而,水系统中的影响因素不同,如采用氯化消毒,可能会影响其他地点的PAH水平。
[Background] In the past, the interior of cast iron drinking water pipes has been used with coal tar and asphalt coating. Polycyclic aromatic hydrocarbons (PAHs) can leach from these coatings into drinking water, posing a potential risk to human health. [Objective] To evaluate the potential human carcinogen risk of PAHs in cast iron pipe coatings. [Method] In a Dutch national study, drinking water samples were collected in 120 locations over a period of 17 days under various operating conditions (such as non-intrusive operation, during pipeline flushing, after pipeline maintenance) and Analyze PAHs in these samples. Then assess the health risks of lifelong exposure. [Results] PAH levels often exceeded drinking water quality standards during flushing; PAH levels dropped rapidly after flushing. After the cast-iron pipes were repaired, PAH levels exceeded drinking-water standards for up to 40 days in some locations. [Conclusions] The PAH exposure limit estimate> 10000 through the drinking water pathway at all 120 measurement points indicates that the impact of PAH exposure through drinking water routes on consumer health is low. However, the factors that affect the water system are different. If chlorination is used, the level of PAH in other locations may be affected.