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首页> 外文会议>Annual conference of the International Society of Exposure Science >Arsenic in private drinking water supplies: human health risk based on underlying geology
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Arsenic in private drinking water supplies: human health risk based on underlying geology

机译：私人饮用水中的砷：基于潜在地质条件的人类健康风险

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Background Revised regulations governing the quality of private drinking water supplies (PWS) were introduced in 2008 as EU Directives, and transposed into UK Regulations in 2009, but there is a lack of coordinated information on the geographical distribution of known hazards such as those related to arsenic (As) and underlying geology. Aim To explore a methodology for risk assessment of exposure to As in drinking water based on the underlying geology and exceedances of the permissible limit. Methods Households in Cornwall with a PWS were identified from a register and a subset was selected to represent areas of different underlying geology. Approximately 500 residents were invited to provide tap and borehole water samples and information on water use. Water samples were analysed for As and other chemical parameters by ICP-MS and ion chromatography. The geological classification of the bedrock was complex in the study area with a need to simplify the categorisation in order characterise exposure in relation to geology. The British Geological Survey simplified this to 8 categories for practical analysis. Results In the first phase of the study covering east Cornwall in 2011, 258 PWS were sampled. Out of the 8 simplified geologies, Mineralisation areas and Gramscatho were more likely to have higher levels of As than others. A possible risk variation by geology category was found, but statistical significance was only borderline. Households found to have water supplies with exceedances for As or other hazards were advised about re-testing and interventions such as water treatment. Conclusions Potential exposure of a proportion of the Cornwall population to As was identified. In relation to risk related to underlying geology, there is an indication that some geologies are more likely to have higher levels of arsenic than others. Results of further analyses in a wider sampling area will estimate the potential influence of geology on the exposure of the population.
机译：背景技术修订后的规范私人饮用水质量（PWS）的法规于2008年作为欧盟指令引入，并于2009年被转换为英国法规，但缺乏有关已知危害（如与之相关的危害）的地理分布的协调信息砷（As）和基础地质。目的根据潜在的地质情况和超出允许的限值，探索一种饮用水中砷暴露风险评估的方法。方法从登记册中识别出具有PWS的康沃尔郡家庭，并选择一个子集来代表不同基础地质区域。邀请了大约500名居民提供自来水和井水样本以及用水信息。通过ICP-MS和离子色谱法分析水样中的As和其他化学参数。在研究区域中，基岩的地质分类很复杂，需要简化分类以表征与地质有关的裸露。英国地质调查局将其简化为8类，以便进行实际分析。结果在研究的第一阶段（2011年覆盖康沃尔郡东部），抽取了258份PWS。在8个简化的地质中，矿化区和Gramscatho的砷含量较高。发现了按地质类别可能的风险变化，但统计意义仅是临界点。建议对发现水供应中砷或其他危害超标的家庭进行重新测试和干预措施，例如水处理。结论确定了一定比例的康沃尔人口对砷的潜在暴露。关于与基础地质有关的风险，有迹象表明某些地质比其他地质更可能具有更高的砷含量。在更广泛的采样区域中进行进一步分析的结果将估计地质对人口暴露的潜在影响。

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