CAJ | 학술논문

为准确识别浅层地下水污染来源及污染过程，选择我国北方某集约化蔬菜种植基地浅层地下水作为研究对象，借助水化学组成、氢氧同位素以及溶解性无机碳(DIC)碳同位素组成，探讨浅层地下水来源以及 DIC 来源和迁移转化特征.结果表明：浅层地下水阳离子以 Ca2+和Mg2+为主，阴离子以HCO3-和SO42-为主，沿地下水流向，水化学类型由HCO3--Ca2+-Mg2+型转变为HCO3--SO42--Mg2+-Ca2+型；浅层地下水δD 组成范围为-69.6‰~-52.7‰，均值为-63.5‰，δ18O 组成范围为-9.29‰~-6.80‰，均值为-8.45‰.大气降水是浅层地下水重要补给来源，靠近河水的浅层地下水还接受地表水的补给；浅层地下水δ13CDIC组成范围为-11.76‰~-5.85‰，均值为-10.43‰.浅层地下水 DIC 来源包括土壤CO2、碳酸盐矿物以及有机质分解.河水DIC侧渗对局部浅层地下水DIC碳同位素造成影响，化学肥料引起的酸性物质参与碳酸盐矿物风化作用以及浅层地下水CO2去气作用对地下水δ13CDIC组成产生影响，在利用DIC碳同位素识别地下水污染来源时需要引起重视.
위준학식별천층지하수오염래원급오염과정，선택아국북방모집약화소채충식기지천층지하수작위연구대상，차조수화학조성、경양동위소이급용해성무궤탄(DIC)탄동위소조성，탐토천층지하수래원이급 DIC 래원화천이전화특정.결과표명：천층지하수양리자이 Ca2+화Mg2+위주，음리자이HCO3-화SO42-위주，연지하수류향，수화학류형유HCO3--Ca2+-Mg2+형전변위HCO3--SO42--Mg2+-Ca2+형；천층지하수δD 조성범위위-69.6‰~-52.7‰，균치위-63.5‰，δ18O 조성범위위-9.29‰~-6.80‰，균치위-8.45‰.대기강수시천층지하수중요보급래원，고근하수적천층지하수환접수지표수적보급；천층지하수δ13CDIC조성범위위-11.76‰~-5.85‰，균치위-10.43‰.천층지하수 DIC 래원포괄토양CO2、탄산염광물이급유궤질분해.하수DIC측삼대국부천층지하수DIC탄동위소조성영향，화학비료인기적산성물질삼여탄산염광물풍화작용이급천층지하수CO2거기작용대지하수δ13CDIC조성산생영향，재이용DIC탄동위소식별지하수오염래원시수요인기중시.
To accurately elucidate the pollution sources and pollutant transformations in subsurface environment, shallow groundwater affected by intensive cultivation of vegetables on open land in North China was selected as objective. Hydrochemical compositions, hydrogen and oxygen isotopes, and dissolved inorganic carbon isotopes of shallow groundwater samples were utilized to delineate the sources of groundwater and to illuminate the sources and transformations of dissolved inorganic carbon. The results demonstrated that Ca2+ and Mg2+ were dominated cations, and HCO3- and SO42- were dominated anions in local groundwater. Along groundwater flow path, hydrochemistry types varied from HCO3--Ca2+-Mg2+ to HCO3--SO42--Mg2+-Ca2+; Hydrogen and oxygen isotope values of shallow groundwater varied from-69.6‰ to-52.7‰ with the average value of-63.5‰ and from-9.29‰ to-6.80‰ with the average value of-8.45‰, respectively. It could be found that atmospheric precipitation was the main recharge source of local groundwater, meanwhile shallow groundwater located near the river water were also recharged from surface water. Dissolved inorganic carbon isotope values of shallow groundwater varied from-11.76‰ to-5.85‰ with average value of-10.43‰. Dissolved inorganic carbon in local groundwater was mainly derived from soil carbon dioxide, carbonate minerals and organic matters. It also indicated that some groundwater samples had been influenced by infiltration of river water. Fertilizer-induced acid participating carbonate minerals weathering and CO2 outgassing in shallow groundwater were two important factors controlling inorganic carbon isotopic compositions in groundwater, which should be paid more attentions during identification of groundwater pollution sources by dissolved inorganic carbon isotopes.