Extraction of chlorinated aliphatic hydrocarbons from groundwater at micromolar concentrations for isotopic analysis of chlorine

被引：13

作者：

Holt, BD ^{[1
]}

Heraty, LJ ^{[1
]}

Sturchio, NC ^{[1
]}

机构：

[1] Argonne Natl Lab, Div Environm Res, Argonne, IL 60439 USA

来源：

ENVIRONMENTAL POLLUTION | 2001年 / 113卷 / 03期

关键词：

extraction; chlorinated aliphatic hydrocarbons; water; chlorine isotope analysis;

D O I：

10.1016/S0269-7491(00)00191-3

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 [工学]; 0830 [环境科学与工程];

摘要：

A method is described for near-quantitative extraction of micromolar concentrations of chlorinated aliphatic hydrocarbons (CAHs) from water for determination of chlorine (Cl) isotope ratios. A low pressure, carrier-gas procedure of extraction was proven to be applicable to CH2Cl2, CCl4, C2H2Cl2, and C2HCl3. The pH of the water was adjusted with NaOH to prevent extraction of CO2 from air and/or dissolved inorganic carbonate species. Recoveries of CAH samples (similar to 15 mu mol), added to and extracted from similar to 340 ml of water, averaged similar to 96%. Average changes in the delta Cl-37 values of the CAHs, attributable to the extraction process, were -0.01 +/-0.06 parts per thousand. Significant isotopic fractionation of Cl was measured during partial extraction of C2CHCl3 from water, indicating that near-quantitative extraction is required for reliable stable Cl isotope analysis of CAHs. This method is also suitable for the extraction of dissolved CAH for gas chromatography-combustion-isotope ratio mass spectrometric measurements of hydrogen and carbon. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：263 / 269

页数：7

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