摘要
自然界中ＣＯ＿２主要来自有机质、大气和碳酸盐岩石，因同位素分馏作用，其稳定碳同位素组成在这三种物质中的分配不尽相同。本文根据地下水实测ＨＣ，的δ￣（１３）Ｃ￣２值，利用热力学及同位素平衡计算与之相平衡的ＣＯ＿２气体的δ￣（１３）Ｃ值，确定了ＣＯ＿２气体来源，进而确定了的有机来源。
CO_2 in natural environment is mainly from organic materials,theatmosphere and carbonate rocks. The contribution of these three substances to stableisotope is different due to isotopic fractionation. According to the measuredδ￣(13)C value of,theδ￣(13) C value of CO_2 gas which is balanced with is obtained bYthermodynamic and isatopic equilibrium calcUlation,Thus the source of CO_2 gas and thesource of is determined both as organic sources.
基金
国家自然科学基金
关键词
碳同位素
同位素分馏
地下水
carbonate isotope,isotopic fractionation,groundwater
