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首页> 外文期刊>Journal of mass spectrometry: JMS >Electron impact, electron capture negative ionization and positive chemical ionization mass spectra of organophosphorus flame retardants and plasticizers
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Electron impact, electron capture negative ionization and positive chemical ionization mass spectra of organophosphorus flame retardants and plasticizers

机译：有机磷阻燃剂和增塑剂的电子冲击，电子捕获负电离和正化学电离质谱

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摘要

Phosphate esters are important commercial products that have been used both as flame retardants and as plasticizers. To analyze these compounds by gas chromatographic mass spectrometry, it is important to understand the mass spectra of these compounds using various ionization modes. This paper is a systematic overview of the electron impact (EI), electron capture negative ionization (ECNI) and positive chemical ionization (PCI) mass spectra of 13 organophosphate esters. These data are useful for developing and optimizing analytical measurements. The EI spectra of these 13 compounds are dominated by ions such as H4PO_4 ~+, (M - Cl)~+, (M - CH_2Cl)~+ or (M)~+ depending on specific chemical structures. The ECNI spectra are generally dominated by (M - R)~-. The PCI spectra are mainly dominated by the protonated molecular ion (M + H)+. The branching of the alkyl substituents, the halogenation of the substituents and, for aromatic phosphate esters, ortho alkylation of the ring are all significant factors controlling the details of the fragmentation processes. EI provides the best sensitivity for the quantitative measurement of these compounds, but PCI and ECNI both have considerable qualitative selectivity.
机译：磷酸酯是重要的商业产品，已被用作阻燃剂和增塑剂。为了通过气相色谱质谱法分析这些化合物，重要的是了解使用各种电离模式的这些化合物的质谱。本文是对13种有机磷酸酯的电子碰撞（EI），电子捕获负电离（ECNI）和正化学电离（PCI）质谱的系统概述。这些数据对于开发和优化分析测量非常有用。根据具体的化学结构，这13种化合物的EI谱图主要由离子如H4PO_4〜+，（M-Cl）〜+，（M-CH_2Cl）〜+或（M）〜+决定。 ECNI谱通常由（M-R）〜-主导。 PCI光谱主要由质子化的分子离子（M + H）+决定。烷基取代基的分支，取代基的卤化以及对于芳族磷酸酯而言，环的邻烷基化都是控制断裂过程细节的重要因素。 EI为定量测定这些化合物提供了最佳灵敏度，但是PCI和ECNI都具有相当高的定性选择性。

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