Online isotope analysis of 37Cl/35Cl universally applied for semi-volatile organic compounds using GC-MC-ICPMS†,Journal of Analytical Atomic Spectrometry

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Online isotope analysis of 37Cl/35Cl universally applied for semi-volatile organic compounds using GC-MC-ICPMS†
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2018-01-18 00:00:00 , DOI: 10.1039/c7ja00404d
Julian Renpenning _{1,

2,

3,

4} , Axel Horst _{1,

2,

3,

4} , Matthias Schmidt _{1,

2,

3,

4} , Matthias Gehre _{1,

2,

3,

4}

Affiliation

Stable chlorine isotope analysis of organic compounds is potentially applicable in various fields in forensics and environmental analytics to investigate the fate of these substances in the environment, but a wider use of this technique is still hampered by the limited applicability of available offline and online techniques. In a previous study we presented a method for compound-specific chlorine isotope analysis of volatile organics including chlorinated methanes, ethanes and ethenes using gas chromatography interfaced with multiple-collector inductively coupled plasma mass spectrometry (GC-MC-ICPMS). In the current study we modified further the setup in order to extend the range of analytes towards semi-volatile organic substances with boiling points of up to 350 °C. The modified method was evaluated by using offline characterized in-house reference materials, such as chloroethenes, chloroacetic acid and hexachlorocyclohexenes. Additionally, analysis of various chlorinated benzenes, chlorinated phenols, chlordecone, dichlorodiphenyltrichloroethane (DDT) and related derivatives was demonstrated. The analytical precision (1σ) was usually better than ±0.2 mUr for single compound and ±0.3 mUr for compound-specific analysis of mixtures. Achieved accuracy was within ±0.2 mUr compared to available offline values. The isotopic detection limit could be significantly improved by one order of magnitude (250 pmol Cl on column, corresponding to ∼10 ng Cl) and is superior to other online state of the art approaches. The demonstrated method allows for the compound-specific stable chlorine isotope analysis of virtually all GC-compatible organics with versatility, high accuracy, and sensitivity.

中文翻译：

使用GC-MC-ICPMS对普遍用于半挥发性有机化合物的³⁷ Cl / ³⁵ Cl进行在线同位素分析†

对有机化合物进行稳定的氯同位素分析可能会应用于法医和环境分析的各个领域，以研究这些物质在环境中的命运，但由于现有离线和在线技术的适用性有限，因此该技术的广泛使用仍然受到阻碍。在先前的研究中，我们提出了使用气相色谱与多收集器电感耦合等离子体质谱（GC-MC-ICPMS）联用对挥发性有机物（包括氯化甲烷，乙烷和乙烯）进行化合物特异性氯同位素分析的方法。在当前的研究中，我们进一步修改了设置，以将分析物的范围扩展到沸点高达350°C的半挥发性有机物质。通过使用离线表征的内部参考材料（如氯乙烯，氯乙酸和六氯环己烯）对改进的方法进行了评估。此外，还对各种氯化苯，氯化苯酚，十氯酮，二氯二苯基三氯乙烷（DDT）和相关衍生物进行了分析。分析精度（1对于单一化合物，σ）通常优于±0.2 mUr，对于混合物的化合物特异性分析，σ）通常优于±0.3 mUr。与可用的离线值相比，获得的精度在±0.2 mUr以内。同位素检测限可以显着提高一个数量级（色谱柱上250 pmol Cl，对应于约10 ng Cl），并且优于其他在线技术水平。证明的方法可对几乎所有与GC兼容的有机物进行特定于化合物的稳定氯同位素分析，并且具有多功能性，高精度和高灵敏度。

更新日期：2018-01-18

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