ZHANG Jing-kai,ZHU Li-ju,JING Er-dan,et al.Determination of Trichloroacetaldehyde in Water by Headspace Solid-Phase Microextraction and Gas Chromatography/Mass Spectrometry[J].China Water & Wastewater,2020,36(24 24):164.
Determination of Trichloroacetaldehyde in Water by Headspace Solid-Phase Microextraction and Gas Chromatography/Mass Spectrometry
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
24 24
Page:
164
Column:
Date of publication:
2020-12-17
- Keywords:
- trichloroacetaldehyde; headspace solid-phase microextraction; gas chromatography/mass spectrometry
- Abstract:
- A new method of headspace solid-phase microextraction combined with gas chromatography/mass spectrometry was developed to determine the level of trichloroacetaldehyde in surface water and drinking water by measuring the concentration of trichloromethane, which is a hydrolyzed product of trichloroacetaldehyde under alkaline conditions. The effects of different extraction heads, dosages of alkali addition, extraction temperature and extraction time on the extraction efficiency were studied. The results indicated that the proposed method achieved the measurement of trichloroacetaldehyde over the range of 0.1-10 μg/L with a correlation coefficient of 0.999 4, and detection limit was 0.01 μg/L. The average recovery of 5.0 μg/L and 0.2 μg/L trichloromethane in pure water were 99.5% and 96.7%, respectively, and the RSDs were 2.2% and 7.4%, respectively. The average recovery of drinking water and surface water was 92.5%-99.4%, and the RSDs was 2.1%-9.4%. This method showed the characteristics of short pretreatment time, high sensitivity, precision and accuracy, which could meet the requirements of actual water quality detection. Compared with the gas chromatography method from GB 5750.10-2006, the pretreatment time is reduced from 2.5 h to 0.5 h, and the analysis efficiency is significantly improved. Meanwhile, the sensitivity is also 100 times higher than that of the national standard method.
Last Update:
2020-12-17