Chlorine stable isotope measurements of chlorinated aliphatic hydrocarbons by thermal ionization mass spectrometry
Chlorine stable isotope measurements of chlorinated aliphatic hydrocarbons by thermal ionization mass spectrometry
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DOI：
10.1016/s0003-2670(01)01566-5
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发表时间：
2002-03-18
影响因子：
6.2
通讯作者：
Terashima, Y
中科院分区：
文献类型：
--
作者：
Numata, M;Nakamura, N;Terashima, Y
研究了一种改进的Cs2Cl+热电离质谱(TIMS)氯同位素分析方法。给出了6家供应商提供的10种商用氯化脂肪族碳氢化合物(CAHs)的增量氯37值(与标准海水氯37/氯35比值的偏差百分比)。用联苯钠试剂处理CAHs。将释放出来的氯离子转化为氯化铯，用TIMS测定其同位素组成。CAH重复分析的外部精密度为千分之0.1-0.4Parts(1sigma(S.D.))。由于每种化合物和每个供应商都有一个独特的增量氯-37值(增量氯-37值：-5.0-+2.9 ppm/1000)，氯同位素数据可以用来追踪地下环境中特定的污染物来源。提出的溶剂萃取法可用于实际污染水样的分析。用KMnO4氧化法从不饱和氯化脂肪族化合物(TCE和PCE)中回收氯原子作为无机氯化物。然而，饱和化合物对KMnO4氧化有一定的抵抗力。然后用TIMS测定回收氯离子的同位素组成。有人建议，这种特定化合物的同位素分析可以提供关于每种污染物过去记录的信息。(C)2002 Elsevier Science B.V.保留所有权利。
An improved method for chlorine isotopic analysis using thermal ionization mass spectrometry (TIMS) of Cs2Cl+ has been investigated. The delta Cl-37 values (parts per mil deviations from the standard seawater Cl-37/Cl-35 ratio) for 10 commercial chlorinated aliphatic hydrocarbons (CAHs), provided by six suppliers are presented. The CAHs were treated with a sodiumbiphenyl reagent. The liberated chloride ions were converted to CsCl and their isotopic compositions were determined by TIMS. Replicate analysis of the CAHs gave an external precision of 0.1-0.4parts per thousand (1sigma(S.D.)). As each compound and each supplier has a distinctive delta Cl-37 value (delta Cl-37 values: -5.0 to +2.9parts per thousand), Cl isotope data can be used to trace a specific source of pollutants in the subsurface environment.Trichloroethene (TCE) and tetrachloroethene (PCE) were extracted from aqueous solutions with toluene and their chlorine isotope compositions were analyzed. The solvent extraction method presented here may be applicable to the analysis of actual contaminated water samples. Chlorine atoms were recovered as inorganic chloride from unsaturated chlorinated aliphatic compounds (TCE and PCE) by KMnO4 oxidation. However, the saturated compounds were resistant to KMnO4 oxidation. The isotopic compositions of the recovered chloride ion were then determined by TIMS. It is suggested that such compound-specific isotopic analyses may give information about the past record of each contaminant. (C) 2002 Elsevier Science B.V. All rights reserved.