| 观测井水质垂向差异及对取样质量的影响 |
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| 作者姓名： | 龚士良 |
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| 作者单位： | 上海市环境地质站 |
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| 摘 要： | 观测井水质垂向差异由三因素引起:抽、灌水过程中含水层水质改变、近井口表层水体氧化、含水层本身存在水质垂向分带。由此易造成不同浓度间水质弥散,从而对使用定深取样器取样带来影响。减缓取样器下放速度,适当加密取样频率有助于克服其影响。在观测井滤水管中部取样具有代表性,可用于定量研究。
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| 关 键 词： | 观测井 水质 取样器 质量 地下水 |
VERTICAL DIFFERENCE OF WATER QUALITY IN OBSERVATION WELL AND ITS INFLUENE ON SAMPLING |
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| Authors: | Gong Shiliang |
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| Institution: | Shanghai Station of Evironmental Geology |
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| Abstract: | The vertical difference of water quality in the observation well is caused by three factors: change of water quality in aquifer during the pumping and injection, the oxidation of the water dody near the surface and the aquifer itself having the vertical hydrogeochemical zones, thus, a dispersion of different concentrations exists. It influences the sample collected by the directing-depth sampler. It is helpful to overcome it by reducing the dropping speed of the sampler, and properly increasing the frequency of sampling. The sample taken from the middle part of the filter tube in the observation well is typical and can be used in quantitative study. |
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| Keywords: | observation well water quality directing-depth sampler |
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