气相色谱-高分辨飞行时间质谱法测定大气中六氯苯的氯同位素丰度比值

为了探索用同位素丰度比值指纹表征大气中有机氯污染物降解现象的可行性,采用气相色谱-高分辨飞行时间质谱法（GC-HR-TOF MS）测定天津市工业区（塘沽,汉沽）与远郊区（于桥）大气污染物六氯苯的氯同位素丰度比值（37Cl/35Cl）。实验数据表明,氯同位素丰度比值的测量精度RSD为2‰5‰;工业区汉沽、塘沽六氯苯的氯同位素丰度比值分别为0.320 7±0.000 8、0.319 3±0.001 6,远郊区于桥的比值为0.323 9±0.000 8;随着污染物浓度的下降（距离污染源渐远）,六氯苯的氯同位素丰度比值有上升的趋势,符合理论预期,这可以归因于六氯苯伴随大气传输过程发生了化学降解现象。本...

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Bibliographic Details
Published in质谱学报 Vol. 37; no. 1; pp. 10 - 16
Main Author 刘咸德 李莉 池逸 张志杰
Format Journal Article
LanguageChinese
Published 中国环境科学研究院,环境基准与风险评价国家重点实验室,北京100012%美资力可仪器(上海)有限公司,上海,200021 2016
Subjects
六氯苯
同位素丰度比值
有机氯污染物
气相色谱-质谱法（GC/MS）
高分辨飞行时间质谱
有机氯污染物
六氯苯
气相色谱-质谱法(GC/MS)
hexachlorobenzene (HCB)
isotope abundance ratio
高分辨飞行时间质谱
gas chromatography-mass spectrometry (GC/MS)
high resolution time-of-flight mass spectrometry
同位素丰度比值
chlorine
Online AccessGet full text
ISSN1004-2997
DOI10.7538/zpxb.youxian.2015.0048

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Summary:为了探索用同位素丰度比值指纹表征大气中有机氯污染物降解现象的可行性,采用气相色谱-高分辨飞行时间质谱法（GC-HR-TOF MS）测定天津市工业区（塘沽,汉沽）与远郊区（于桥）大气污染物六氯苯的氯同位素丰度比值（37Cl/35Cl）。实验数据表明,氯同位素丰度比值的测量精度RSD为2‰5‰;工业区汉沽、塘沽六氯苯的氯同位素丰度比值分别为0.320 7±0.000 8、0.319 3±0.001 6,远郊区于桥的比值为0.323 9±0.000 8;随着污染物浓度的下降（距离污染源渐远）,六氯苯的氯同位素丰度比值有上升的趋势,符合理论预期,这可以归因于六氯苯伴随大气传输过程发生了化学降解现象。本方法可用于大气中有机氯污染物（如六氯苯）的氯同位素丰度比值的测定,并有望用于研究有机氯污染物的降解等环境过程。
Bibliography:chlorine;isotope abundance ratio;hexachlorobenzene（HCB）;high resolution time-of-flight mass spectrometry;gas chromatography-mass spectrometry（GC/MS）
To explore the feasibility of using chlorine isotope abundance ratio to investigate the degradation of organochlorine pollutants in air,gas chromatography-high resolution time-of-flight mass spectrometry（GC-HR-TOF MS）method was carried out for calculation of chlorine isotope abundance ratio（37 Cl/35 Cl）based on measurements of atmospheric hexachlorobenzene（HCB）in both industrial（Tanggu and Hangu）and rural（Yuqiao）sites in Tianjin.Air samples were collected using passive air sampler with XAD-2resin as absorbent.Interference free HCB peaks were obtained as indicated by accurate masses and good spectral match.The chlorine isotope abundance ratio（37Cl/35Cl）of HCB was derived from its isotopic peak profile.Since fragmentation maycomplicate the situation,molecular ions were preferred.Most of the mass peaks ought to be taken into calculation,however,inclusion of small fra
ISSN:1004-2997
DOI:10.7538/zpxb.youxian.2015.0048