Porowska D
Faculty of Geology, University of Warsaw, Institute of Hydrogeology and Engineering Geology, Żwirki i Wigury 93, Warsaw 02-089, Poland E-mail:
Water Sci Technol. 2017 Jan;75(2):328-339. doi: 10.2166/wst.2016.517.
Chemical and isotopic analyses of groundwater from piezometers localized around a reclaimed landfill were performed in order to identify the boundaries of groundwater contamination zone. Spatial distribution of dissolved inorganic carbon (DIC) concentration and stable carbon isotopes in the groundwater was used to distinguish the piezometers localized within the contaminated aquifer. Background groundwater was characterized by low DIC concentration (from 1.8 to 5.0 mmol/L) and negative values of δC (from -20.6‰ to -12.4‰). Higher DIC concentrations (from 6.0 to 12.5 mmol/L) and higher values of δC (from -10.9 to +3.6‰) were determined in groundwater contaminated by landfill leachate. The study confirmed that δC value in the groundwater was a useful tracer in determining the extent of the contamination zone around the landfill. In general, upgradient from the landfill, carbon isotopic composition of groundwater depended on natural sources of carbon and δC values were negative. Downgradient from the landfill, where groundwater was contaminated by the landfill leachate, δC values were higher, sometimes even positive.
为了确定地下水污染带的边界，对位于一个已填埋垃圾场周围的测压管中的地下水进行了化学和同位素分析。利用地下水中溶解无机碳（DIC）浓度和稳定碳同位素的空间分布来区分位于受污染含水层内的测压管。背景地下水的特征是DIC浓度较低（1.8至5.0 mmol/L），δC值为负值（-20.6‰至-12.4‰）。在受垃圾渗滤液污染的地下水中，测定出较高的DIC浓度（6.0至12.5 mmol/L）和较高的δC值（-10.9至+3.6‰）。该研究证实，地下水中的δC值是确定垃圾场周围污染带范围的有用示踪剂。一般来说，在垃圾场的上游，地下水的碳同位素组成取决于碳的天然来源，δC值为负。在垃圾场的下游，地下水受到垃圾渗滤液的污染，δC值较高，有时甚至为正。
