分析测试学报2013，Vol.32Issue(8)：929-934,6.DOI:10.3969/j.issn.1004-4957.2013.08.004
串联质谱法鉴定丙基膦酸烷基酯异构体
Identification on Isomers of Dialkyl iso-and n-Propylphosphonates Using Tandem Mass Spectrometry
摘要
Abstract
Structure analysis of dialkyl propylphosphonates requires the specific identity of isomeric propyl groups bonded to phosphorus.To this end,homologous series of isomeric dialkyl iso-and npropylphosphonates were analysed by gas chromatography-quadrupole tandem mass spectrometry.For identification of the isomer,characteristic ion m/z 125 in electron impact mass spectrometry(EIMS) and quasi-molecular ions in chemical ionization mass spectrometry(CI-MS) were studied by tandem mass spectrometry(MS/MS) in product scan mode.The parameters including collision energy and collision gas pressure were optimized.The experiments showed that precursor ions m/z 125 of dialkyl n-propylphosphonate screened mainly product ion m/z 107 under condition of 20 V of collision energy and 1.0 mTorr of collision gas pressure by EI-MS/MS,while precursor ions m/z 125 of dialkyl isopropylphosphonate screened mainly product ions m/z 65 and m/z 83.In the same condition,quasi-molecular ions of dialkyl n-propylphosphonate,which were precursor ions,screened mainly product ions m/z 125 and 107 and quasi-molecular ions of dialkyl isopropylphosphonate screened mainly product ions m/z 125,107 and 83.For most chemicals,the product ion m/z 125 is base peak.Based on EI and CI tandem mass spectrometry,the isomeric dialkyl propylphosphonates could be rapidly identificated.关键词
正丙基膦酸烷基酯/异丙基膦酸烷基酯/异构体/串联质谱(MS/MS)Key words
dialkyl n-propylphosphonate/ dialkyl isopropylphosphonate / isomer/ MS/MS分类
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张兰波,刘景全,裴承新,周世坤..串联质谱法鉴定丙基膦酸烷基酯异构体[J].分析测试学报,2013,32(8):929-934,6.
