【摘要】 化学热动力学和稳定碳同位素[δ(13C)]的研究表明浅层地下水中的碳源是地下含水层中有机物淋溶和降解作用的结果。根据天然有机物的降解规律以及CO2在水中的溶解平衡,采用CO2分压[p(CO2)]来表征有机物的影响,通过计算p(CO2)与地下水中部分化学指标的相关关系,讨论了有机物对地下水化学性质的影响。结果表明地下含水层中有机物的增加会导致地下水酸度的增大以及HCO3-、Na+和F-等质量浓度的增大;且由于地层中有机物含量较高,导致地下水中含氮物质总量升高,同时,由于大量有机物的存在而导致地下水处于还原性环境,促使地下水的氮组分更多地以NO2--N的形式存在。更多还原

【Abstract】 The effect of organic material on groundwater quality is investigated in the paper. The carbon resources of the shallow groundwater are determined as the eluviations and degradation results of organic material in the aquifers from the point of view of chemical thermodynamics and carbon isotope δ（ 13 C） technology.According to the rule of NOM degradation and CO₂ dissolution equilibrium in water,the effects of organic material on groundwater quality, which is expressed by partial pressure of CO₂,are discussed by calculating the correlations between partial pressure of CO₂ and several hydro-chemical indexes in the groundwater.The results show that the concentration of HCO-₃,Na+,F-and total nitrogen material increase with the increasing of NOM in aquifer, nevertheless,the condition is converse as to pH of the groundwater. Moreover, NO-₂-N is the main material of nitrogen matters because of the abundance of NOM in the aquifer.更多还原