Liquid chromatography/isotope ratio mass spectrometry analysis of halogenated benzoates for characterization of the underlying degradation reaction in Thauera chlorobenzoica CB-1T.
Liquid chromatography/isotope ratio mass spectrometry analysis of halogenated benzoates for characterization of the underlying degradation reaction in Thauera chlorobenzoica CB-1T.
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卤代苯甲酸酯的液相色谱/同位素比质谱分析,用于表征 Thauera 氯苯甲酸 CB-1T 中潜在的降解反应
DOI:
10.1002/rcm.8113
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Nijenhuis I
中科院分区:
文献类型:
--
作者:
Franke S;Kummel S;Nijenhuis I
RationaleHalogenated benzoic acids occur in the environment due to their widespread agricultural and pharmaceutical use. Compound‐specific stable isotope analysis (CSIA) has developed over the last decades for investigation ofin situtransformation and reaction mechanisms of environmental pollutants amenable by gas chromatography (GC). As polar compounds are unsuitable for GC analysis we developed a method to perform liquid chromatography (LC)/CSIA for halogenated benzoates.MethodsLC/isotope ratio mass spectrometry (IRMS) utilizing a LC‐Surveyor pump coupled to a MAT 253 isotope ratio mass spectrometer via a LC‐Isolink interface was applied. For chromatographic separation a YMC‐Triart C18 column and a potassium hydrogen phosphate buffer (150 mM, pH 7.0, 40°C, 200 μL mL−1) were used, followed by wet oxidation deploying 1.5 mol L−1ortho‐phosphoric acid and 200 g L−1sodium peroxodisulfate at 75 μL mL−1.ResultsSeparation of benzoate and halogenated benzoates could be achieved in less than 40 min over a concentration range of 2 orders of magnitude. Under these conditions the dehalogenation reaction ofThauera chlorobenzoica3CB‐1Tusing 3‐chloro‐, 3‐bromo‐ and 4‐chlorobenzoic acid was investigated resulting in inverse carbon isotope fractionation formeta‐substituted benzoic acids and minor normal fractionation forpara‐substituted benzoic acids. Together with the respective growth rates this led to the assumption that dehalogenation ofpara‐halobenzoic acids follows a different mechanism from that ofmeta‐halobenzoic acids.ConclusionsA new LC/IRMS method for the quantitative determination of halogenated benzoates was developed and used to investigate thein vivotransformation pathways of these compounds, providing some insights into degradation and removal of these widespread compounds byT. chlorobenzoica3CB‐1T.
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发表时间:
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