Continuous Flow Analysis of Total Organic Carbon in Polar Ice Cores

被引：25

作者：

Federer, Urs ^{[1
,2
]}

Kaufmann, Patrik R. ^{[1
,2
]}

Hutterli, Manuel A. ^{[3
]}

Schuepbach, Simon ^{[1
,2
]}

Stocker, Thomas F. ^{[1
,2
]}

机构：

[1] Univ Bern, Inst Phys, Bern, Switzerland

[2] Univ Bern, Oeschger Ctr Climate Change Res, Bern, Switzerland

[3] British Antarctic Survey, Cambridge CB3 0ET, England

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2008年 / 42卷 / 21期

基金：

英国自然环境研究理事会; 瑞士国家科学基金会;

关键词：

D O I：

10.1021/es801244e

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Ice cores are a widely used archive to reconstruct past changes of the climate system. This is done by measuring the concentration of substances in the ice and in the air of bubbles enclosed in ice. Some species pertaining to the carbon cycle (e.g., CO2, CH4) are routinely measured. However, information about the organic fraction of the impurities in polar ice is still very limited. Therefore, we developed a new method to determine the content of total organic carbon (TOC) in ice cores using a continuous flow analysis (CFA) system. The method is based on photochemical oxidation of TOC and the electrolytic quantification of the CO2 produced during oxidation. The TOC instrument features a limit of detection of 2 ppbC and a response time of 60 s at a sample flow rate of 0.7 mL/ min and a linear measurement range of 2-4000 ppbC. First measurements on the ice core from Talos Dome, Antarctica, reveal TOC concentrations varying between 80 and 360 ppbC in the 20 m section presented.

引用

页码：8039 / 8043

页数：5

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