沂源地区不同类型岩土淋溶水与浸泡水的化学特征分析  

Analysis of Hydro-geochemistry Characteristics of Different Rock and Soil in Yiyuan Area by Experiment of Leaching and Soaking

作　　者：张洪英[1] 高宗军[1] 时孟杰 牟林凯 李伟[2] 

机构地区：[1]山东科技大学地球科学与工程学院,山东青岛266590 [2]中国地质调查局水文地质环境地质调查中心,河北保定071051

出　　处：《水文》2016年第6期49-54,80,共7页Journal of China Hydrology

基　　金：沂蒙山革命老区1:5万水文地质调查项目(121201012000150003)

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。In order to study the influence of aeration zone on the hydro-geochemistry changes in the process of precipitation recharge to groundwater, surface rock and soil samples of unsaturated zone in Yiyuan were collected and experimented by leaching and immersion. From the leaching test, these soluble anions, such as Cl^-, SO4^2-, CO3^2-, NO2^-, NO3^-, etc, dissolved into the leaching solution firstly and metal ions K^＋, Ca^2＋, Mg^2＋, Fe and so on in the solution began to increase subsequently. The initial p H value of leaching solution was alkaline, and then to neutral transition. The results of the soaking ex periment show that after 5 minutes immerse, the chemical composition of different soak solution of rock and soil samples changed obviously. With the increase of soaking time, the content of ions like K^＋, Na^＋, Ca^2＋, Mg^2＋, Cl^-, HCO3^-and the salt content in soaking solution increased in different degrees, but the ions of Cl^-, SO4^2-changed differently in different rock and soil. Presumably know, a large number of materials have been leaching out and chemical properties of precipitation happened to greatly change while the process of groundwater recharged through the aeration zone.

关 键 词：岩土 淋溶 浸泡 地下水 水文地球化学 

分 类 号：P641.3[天文地球—地质矿产勘探]