顶空气相色谱法测定海水中三氯乙醛

Determination of chloral in seawater by headspace and gas chromatography

三氯乙醛是海水淡化杀生剂副产物,随浓海水排放入海,对海洋生物具有致畸性,建立海水中三氯乙醛检测方法,具有重要意义。本文采用顶空方法对海水样品中的三氯乙醛进行分离富集,建立了气相色谱-电子捕获检测器（μECD）的分析方法。讨论了顶空时间、顶空温度、水样盐度等实验条件对顶空富集效率的影响。方法在0.05-20.0μg/L范围呈线性关系,相关系数0.9996,方法检出限（3S/N）为0.006μg/L,相对标准偏差（RSD）0.51%-1.9%,加标回收率在96.1%-113.9%之间。

Chloral represents one kind of common non-volatile chlorination by-product of the drained concentrated seawater from a seawater desalination plant,which has been proved to have mutagenicity. Therefore,it is necessary to establish a fast,sensitive and accurate method for detecting the concentration of chloral in concentrated seawater. Herein,a method is developed for this purpose by headspace and capillary GC with an electron capture detector（ μECD）. Determination parameters,such as headspace time,headspace temperature and seawater salinity are discussed in detail. The detection limits and correlation coefficient of method are respectively 0. 006 μg / L and 0. 9996. This method can be employed in the chloral concentration range of 0. 05 ～ 20. 0 μg / L. The relative standard deviation（ RSD） is 0. 51% ～ 1. 9%. Additionally,test for recovery is made by standard addition method,giving results in the range of 96. 1% ～ 113. 9%.