DISSOLVED ORGANIC-CARBON AND METHANE IN A REGIONAL CONFINED AQUIFER, SOUTHERN ONTARIO, CANADA - CARBON-ISOTOPE EVIDENCE FOR ASSOCIATED SUBSURFACE SOURCES

被引：86

作者：

ARAVENA, R

WASSENAAR, LI

机构：

[1] Waterloo Centre for Groundwater Research, University of Waterloo, Waterloo

[2] National Hydrology Research Institute, Environment Canada, 11 Innovation Blvd., Saskatoon

来源：

APPLIED GEOCHEMISTRY | 1993年 / 8卷 / 05期

关键词：

D O I：

10.1016/0883-2927(93)90077-T

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Information regarding the origin, composition and transport of natural dissolved organic carbon (DOC) in groundwater is necessary to understand the transport of metals and organic pollutants, as well as for the use of C-14 in DOC as an isotopic groundwater dating method. Previous research in several groundwater systems has suggested soil organic C is the predominant source of high molecular weight DOC to the subsurface. Through the use of stable isotopes, C-14 and geochemical analyses, this study shows that significant concentrations of DOC and CH4 in a regional confined aquifer can be generated in situ from subsurface sedimentary organic sources. The DOC and CH4 produced is a combined result of degradation of buried peats and bacterial action, resulting in high DOC concentrations and strongly methanogenic conditions in the aquifer. The DOC and CH4 comprise, on average, nearly 50% of the total dissolved C pool in the central part of the aquifer. Methanogenic conditions complicate isotopic groundwater dating by the conventional dissolved inorganic carbon (DIC) method. Estimates of isotopic groundwater residence times using DOC C-14 data are proposed by the application of C-14 isotope and mass balance corrections.

引用

页码：483 / 493

页数：11

共 36 条

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