GC/MS和LC/MS法检测水溶液中壬基酚的氯化产物

 含40 mg/L壬基酚的水样加入次氯酸钠有效氯含量10 mg/L)，反应4天后用氯仿提取壬基酚氯化反应产物，分别用GC/MS和LC/MS进行检测。GC/MS 和LC/MS的检测结果均显示，壬基酚和次氯酸钠反应主要生成一氯壬基酚和二氯壬基酚等两类取代产物。GC/MS方法可分离壬基酚及其氯取代产物的多种同分异构体，其总离子流图上除了原料壬基酚(m/z 220)以外，还显示反应生成的产物峰，根据每个产物峰所对应的质谱图尤其是同位素峰的丰度比，再结合谱库的检索信息，可以推断出反应产物为壬基酚的一氯(m/z254)或二氯取代物(m/z 288)。LC/MS中每类化合物分别对应一个色谱峰，每个色谱峰对应的质谱图信息简单明确，由于采用(-)ESI模式，显示该化合物的［M-H］相对分子质量，因此可作为判断该类化合物的依据。同时，(-)ESI MS直接进样的方式可以实现样品的快速检测。

Characterization of Chlorination Products of Nonylphenol by GC/MS and LC/MS in Aqueous Solution

NaClO was added to the aqueous solution containing nonylphenol. The CHCl3 extract of the chlorination product was analyzed by using GC/MS and LC/MS. Two kinds of products including monochloro nonylphenol and dichloro nonylphenol were found by both methods.The isomers of nonylphenol and its chlorination products could be detected by GC/MS method.By comparing the relative intensity of the isotope　from mass spectrum of the products and the search information from the NIST Library, mono (m/z 254) and dichloro nonylphenols (m/z 288) were deduced beside the nonylphenol (m/z 220). In terms of the data from LC/MS, similar results were found. When applying (-) ESI mode, ［M-H］molecular weight for each kind of chlorination compound was obtained.(-)ESI MS direct injection mode could be used as a rapid screening method for analysis of these kinds of compound.