四川省某镇井水污染状况调查
Investigation of Well Water Pollution in a Town of Sichuan
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摘要:
目的 了解四川省某镇井水污染状况, 包括污染物种类、含量及其与污染源间距离的关系。 方法 采用整群抽样方法, 抽取 95份井水水样, 测定挥发酚、氯化物等 6项指标。分别在造纸厂排污沟不同距离处采集沟水, 同时采集离排污沟不同距离处3口井的井水作为样本,检测水中挥发酚、氯化物等指标水平及分析其与污染源距离间的相关性。 结果 95口井中有 8口井的井水挥发酚浓度(0.007~0.010 mg/L)超过我国生活饮用水标准 0.002 mg/L, 占 8.42%; 其中 1口井的井水中汞含量为 0.04 mg/L, 超过国家饮井水标准, 其余指标均合格。挥发酚与污染源间距离存在相关性, 随距离的增加, 挥发酚浓度下降, 离排污沟 100m以外的井水挥发酚浓度 < 0.002mg/L, 其他指标与排污沟距离无相关性。 结论 该镇部分井水受到挥发酚污染, 建议饮水井必须打在离排污沟 100m以外, 距排污沟 100m以内的井水不可作为饮用水使用。 Abstract:Objective To investigate the pollution status of well water and the correlation between pollution level and the distance from pollutant source, to provide a reference for the drinking water sanitation for villagers. Methods Cluster sampling method was applied to select 95 water samples from different wells and 6 indices analyzed such as volatile phenol, chloride, etc. Elsewhere, pollutant water samples at different place in a paper mill drains and 3 well water samples at different distance from the paper mill drains were collected and analyzed. At the same time, the correlation between the distance from pollutant source and those 6 indices of the well water samples was analyzed. Results Volatile phenol in 8.42% well water samples exceeded the National Standard(0.007~0.010 mg/L). Hg content in one well water sample was impermissibly high, the concentration was 0.04 mg/L. The other indices were all meeting the Standard. Volatile phenol content had strong association with the distance from pollutant source, its concentration in well water samples decreased as the distance from pollutant source increased. Its concentration in well water samples of 100 meters away form the paper mill drains was less than 0.002 mg/L, fitting the Standard. Conclusion Part of well water was polluted by volatile phenol in a town of Sichuan. Wells should be drilled at least 100 m away from paper mill drains. The well water located less than 100 m from the pollutant source was not suitable for drinking.
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