贵阳地表水-地下水的硫和氯同位素组成特征及其污染物示踪意义

δ^(37)Cl and δ^(34)S Variations of Cl^- and SO_4^(2-) in Groundwater and Surface Water of Guiyang Area,China

喀斯特地表水和地下水的交换活跃,地下水系统容易受到地表污染物的污染。为了解喀斯特城市地表水—地下水系统污染特征和污染物质来源,对贵阳市地表水、地下水、雨水和城市排污污水的硫同位素和氯同位素组成变化进行了研究。贵阳市不同类型水体的δ37Cl值在-4.07‰～+2.03‰之间变化,δ34SSO4值变化为-20.4‰～+20.9‰。大气输入物质和城市排污污水的δ37Cl、δ34S及Cl-/SO42-比值与地表水和地下水的不同,稳定硫和氯同位素的结合研究为示踪地下水污染物来源提供了有效研究手段。贵阳市地下水中的Cl-和SO24-至少有4种来源,人为活动通过城市排污和大气输入向地下水系统大量输入了硫酸盐和氯离子。

Due to active exchange between surface water and ground water in a karstic hydrological system, we carried out a study of δ^37Cl and δ^34S variations of chloride and sulfate ions in the karstic surface/ground water system of Guiyang city, southwestern China, with the and the sources of the contaminants. The surface, main purpose to understand ground water environmental pollution and the sources of the contaminants. The surface, ground, rain and waste water show variable δ^37Cl and δ^34S values, with δ^37Cl values varying between -4.07%0 and ＋ 2.03%0, and δ^34S values between -20.4%0 and ＋ 20.9%00 The studied atmospheric and anthropogenic inputs have specific range of δ^37 Cl and δ^34S values, which can provide an effective isotopic method for tracing contaminants in a ground water system. We conclude that at least four sources exist to account for the variations of δ^37Cl and δ^34S values of chloride and sulfate ions in the ground water system, and that human activities have inputted a significant amount of sulfate and chloride ions, as well as oth-er contaminants into the studied ground water system through atmospheric emission and municipal sewage.