沂源地区不同类型岩土淋溶水与浸泡水的化学特征分析

发布时间：2018-03-13 22:13

本文选题：岩土　切入点：淋溶　出处：《水文》2016年06期 　论文类型：期刊论文

【摘要】：为研究降水补给地下水过程中包气带岩土对水化学的影响,在沂源地区采集了不同地表岩土样品开展淋溶和浸泡试验。淋溶结果显示:易溶的Cl~-、SO_4~(2-)、CO_3~(2-)、NO_2~-、NO_3~-等阴离子率先溶解进入淋溶水中,之后K~+,Ca~(2+),Mg~(2+),Fe等含量逐渐增加,且淋溶初期p H值呈碱性,之后向中性过渡。浸泡结果显示:不同类型岩土样经过浸泡5min后,其水化学组分发生了显著变化;随浸泡时间增加,K~+、Na~+、Ca~(2+)、Mg~(2+)、HCO_3~-及含盐量均出现不同程度增加,但Cl~-、SO_4~(2-)在不同类型岩土中含量变化则是不同的。由此推测,降水转入地下水过程中,透过地表浅层包气带时就已经淋溶了大量物质,水化学性质发生了重大变化。
[Abstract]:In order to study the effect of aeration zone rock and soil on hydrochemistry in the process of precipitation recharge of groundwater, Leaching and soaking tests of different surface rock and soil samples were carried out in the Yiyuan area. The leaching results showed that the soluble Cl _ (-) so _ (4) C _ (2) C _ (2) C _ (2) C _ (2) C _ (2) C _ (2) C _ (2) C _ (2) C _ (2) O _ (3) and so on anion were firstly dissolved into the leached water, and then the contents of K ~ (+) Ca _ (2) mg _ (2) O _ (2) O _ ((Fe)) increased gradually. The pH value was alkaline at the beginning of leaching and then turned to neutral. The results showed that the hydrochemical composition of different types of rock and soil samples changed significantly after immersion for 5 min. With the increase of soaking time, both K ~ (+) Na ~ (+) Na ~ ((1) C ~ ((2)) C ~ ((2)) and HCO3C _ (2) and its salt content have increased to different extent, but the content of Cl-Li so _ (4) ~ (2) is different in different types of rock and soil. Therefore, it is inferred that the precipitation changes into the process of groundwater. A large amount of substances have been leached through the shallow aeration zone of the surface, and the hydrochemical properties have changed greatly.
【作者单位】：山东科技大学地球科学与工程学院;中国地质调查局水文地质环境地质调查中心;
【基金】：沂蒙山革命老区1:5万水文地质调查项目(121201012000150003)
【分类号】：P641.3

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