北京市朝阳区地下水化学特征及其变化规律  

Hydrochemical characteristics and change of groundwater in Chaoyang District of Beijing City

作　　者：李炳华[1] 崔学慧[2] 朱亚雷[3] 郑凡东[1] 

机构地区：[1]北京市水利科学研究所,北京100048 [2]中国石油大学理学院,北京102249 [3]北京市朝阳区水务局,北京100026

出　　处：《水资源保护》2012年第5期7-12,24,共7页Water Resources Protection

基　　金：北京市科委重大科研项目(D090409004009004);水利部公益科研专项(201001067)

摘　　要：为了揭示北京市朝阳区水化学特征的形成机制,采集2007—2009年不同季节中共计144个地下水样品进行监测,应用相关分析法、水化学方法和离子比例法分析地下水水化学特征、影响因素和变化规律。结果表明:丰水期和枯水期地下水水化学组分差别较小。地下水阴离子中HCO3-占绝对主导地位且含量相对稳定,质量浓度均值在290～302 mg/L,而Cl-受环境影响质量浓度变化较大,变异系数在95.7%～132%,阳离子则以Na+、Ca2+为主,质量浓度均值分别为53～72 mg/L和49～62 mg/L,且Na+质量浓度变化稍大。总体上朝阳区地下水TDS中等,均值为449.4 mg/L,与Cl-、SO24-、HCO3-、Ca2+和Mg2+的质量浓度呈显著正相关关系。地下水化学类型以HCO3-NaCa为主,少数地段出现HCO3Cl-CaMg和HCO3SO4-NaCa。In order to investigate the mechanism of formation of hydrochemical characteristics of the groundwater in the Chaoyang District of Beijing City, 144 groundwater samples were collected and analyzed in different seasons from 2007 to 2009. Correlation analysis and hydrochemical and ion ratio methods were used to identify the hydrochemical characteristics, influencing factors, and change of groundwater in this region. The results show the following： First, there was no significant difference in the component content of groundwater in flood and dry periods. Second, HCO3^- was the dominant anion with an average content ranging from 290 to 302 mg/L, and the content of Cl^- fluctuated relatively more significantly with a variation coefficient ranging from 95.7% to 132%. Na^＋ and Ca^2＋ were the dominant cations with average contents ranging from 53 to 72 mg/L and 49 to 62 mg/L, respectively, and the content of Na^＋ changed significantly. On the whole, the content of TDS in the groundwater of this region was moderate with an average value of 449.4 mg/L, and was in significantly positive correlation with the contents of Cl^- , SO4^2- , HCO3^-, Ca^2＋ , and Mg^2＋. The hydrochemical type of groundwater was mainly HCO3- NaCa, and occasionally HCO3Cl-CaMg or HCO3SO4-NaCa in some locations.

关 键 词：地下水 水化学 离子比例法 北京市朝阳区 

分 类 号：X523[环境科学与工程—环境工程]