银川平原水化学特征分析

发布时间：2018-03-04 17:48

本文选题：银川平原　切入点：水化学特征　出处：《水文地质工程地质》2017年02期 　论文类型：期刊论文

【摘要】：基于银川平原的水文地质条件,对研究区的地下水环境综合指标与地下水化学类型进行了分析:EC值与DO值呈负相关关系,随着含盐量的增高,EC值增高,DO值减小;TDS与EC之间存在较好的正相关性,水中溶解的盐类越多,水的TDS值越高,水的导电性越好,其电导率EC值越大。阳离子平均浓度由大到小为Na~+Ca~(2+)Mg~(2+)K~+NH_4~+,阴离子平均浓度由大到小为HCO_3~-SO_4~(2-)Cl~-。研究区地下水类型以HCO_3·SO_4—Ca·Mg、HCO_3·SO_4—Ca·Na、HCO_3·SO_4—Na·Mg,以及SO_4·HCO_3—Na·Mg等类型为主。活度系数与离子强度呈反比,即离子强度升高导致水溶液中的离子浓度和电荷量升高,离子重新组合成溶质,导致离子活度系数下降。研究区内方解石最接近于平衡状态,可能存在于含水层环境中。对地下水环境综合指标和各组分浓度以及研究区水化学的形成环境进行分析可知:位于研究区中南部的65号点属于SO_4·Cl—Na型水,受污染的可能性大;而在其南部的4、83、290号点,由于位于黄河灌溉区,受地表水的影响增强,地下水污染程度较65号点低。
[Abstract]:The hydrogeological conditions of Yinchuan Plain Based on groundwater environment comprehensive index and groundwater chemical types are analyzed: the value of EC was negatively correlated with DO value, with the increase of salt content, EC value increased, DO value decreased; there is a positive correlation between TDS and EC is better, more salt dissolved in water the water TDS value is high, the better the conductivity of water, the conductivity of the EC value is bigger. The average concentration of cations from large to small Na~+Ca~ (2+) Mg~ (2+) K~+NH_4~+, the average concentration of anions from large to small HCO_3~-SO_4~ (2-) Cl~-. underground water types in the study area with HCO_3 - SO_4 - Ca Mg, HCO_3 - SO_4 - Ca - Na, HCO_3 - SO_4 - Na - Mg, and SO_4 - HCO_3 - Na - Mg type. The activity coefficient is inversely related to the ionic strength, which leads to the increase of ionic strength and charge ion concentration in aqueous solution increased, ion re combined into solute, lead ion activity The coefficient of decline. In the research area of calcite are most close to the equilibrium state, may exist in the aquifer environment. The analysis on the formation of environmental comprehensive index of groundwater environment and the concentration of each component as well as the research area of water chemistry: located in the south central area of No. 65 SO_4 - Cl - Na point belongs to the type of water, the possibility of contamination large; and in the south of 4,83290, located in the the Yellow River Irrigation District, enhance the influence of the surface water, groundwater pollution degree is 65 points lower.

【作者单位】：河北地质大学;中国地质科学院水文地质环境研究所;
【基金】：国土资源大调查项目(1212011220982)
【分类号】：P641.3

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