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首页> 外文期刊>Environmental Engineering Science >Simplified Analysis of Chlorinated Ethenes in Water Samples by Gas Chromatography with Flame Ionization Detection
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Simplified Analysis of Chlorinated Ethenes in Water Samples by Gas Chromatography with Flame Ionization Detection

机译：气相色谱-火焰电离检测法简化水样中氯代乙烷的分析

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摘要

Chlorinated ethenes are among the most common environmental contaminants and are known or suspected carcinogens. This class of compounds includes perchloroethene (PCE), trichloroethene (TCE), and their breakdown products, including dichloroethene (DCE) isomers and vinyl chloride (VC). Engineers and scientists must be able to measure concentrations of these chemicals in water samples to assess site contamination, monitor clean-up progress, and test possible remediation technologies. Gas chromatography with flame ionization detection (GC/FID) is a common method for measuring these contaminants in environmental samples. In this study, we tested the hypothesis that FID response factors are equal for all chlorinated ethene compounds. The rationale for the investigation was that if the hypothesis is correct, a single calibration curve can be used for GC/FID analysis of all chlorinated ethene compounds, saving time and money during sample analysis. Based on our measurements, a single calibration curve (FID response versus mass of analyte injected) is applicable to analysis of PCE, TCE, and all three DCE isomers (r2=0.990, n=50 measurements), allowing for simplified quantification of those chemicals. However, the apparent FID response factor for VC was lower by 40%, indicating that a separate calibration curve would need to be used to accurately estimate the VC concentration in water samples. The difference in the apparent VC response factor is caused predominantly by losses of VC to volatilization during the analysis.
机译：氯化乙烯是最常见的环境污染物之一，是已知或可疑的致癌物。这类化合物包括全氯乙烯（PCE），三氯乙烯（TCE）及其分解产物，包括二氯乙烯（DCE）异构体和氯乙烯（VC）。工程师和科学家必须能够测量水样中这些化学物质的浓度，以评估场地污染，监测清理进度并测试可能的修复技术。带有火焰离子化检测的气相色谱仪（GC / FID）是测量环境样品中这些污染物的常用方法。在这项研究中，我们检验了以下假设：所有氯乙烯化合物的FID响应因子均相等。研究的基本原理是，如果假设正确，则可以使用一条校准曲线对所有氯化乙烯化合物进行GC / FID分析，从而节省了样品分析的时间和金钱。根据我们的测量，一条校准曲线（FID响应与注入的分析物质量之比）适用于分析PCE，TCE和所有三种DCE异构体（r2 = 0.990，n = 50测量），从而简化了这些化学物质的定量分析。但是，VC的表观FID响应因子降低了40％，这表明需要使用单独的校准曲线来准确估算水样品中的VC浓度。表观VC响应因子的差异主要是由于分析过程中VC挥发所致。

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