Method of Analysis of Trace Trihalomethanes in Water by Headspace Solid-Phase Microextraction

• Main Authors: CHEN, YI-HUI, 陳奕卉
• Other Authors: Yi-Chang Lin
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/66021200361630495872

碩士 === 國立臺灣大學 === 環境衛生研究所 === 89 === Trihalomethanes are the most frequently identified chlorination by-products in water supplies. This study was to establish method for detecting trace trihalomethanes in water using headspace solid-phase microextraction. We attempted to develop a fast, simple and solvent-free technology, avoiding complicated pre-treatment procedure. We have, in advance, conducted various tests and investigated factors that may be associated with the efficiency of solid-phase microextraction, to obtain an optimal condition in trihalomethanes extraction. We added 0.75g K2CO3 and 2mL water sample in a 4mL vial, stirring at the speed of 980rpm. After the sample was balanced for 10min, we used CAR/PDMS fiber to perform headspace solid-phase microextraction for 20 min, and thermal desorption at 280℃ for 2min. For the quality control calibration, we used CHCl3 and CHBr3 at the range of 0.1-2.5 μg/L, and CHBrCl2 and CHBr2Cl at the range of 0.1-1.5 μg/L. The correlation coefficients were all above 0.996.The method detection limits were 0.072 μg/L for CHCl3, 0.049 μg/L for CHBrCl2, 0.059 μg/L for CHBr2Cl, and 0.072 μg/L for CHBr3. This study also has established another two calibration curves with higher concentrations for examining the water supplies in Taipei area. In doing so, the “optimal adsorption fiber for sample with higher trihalomethane level” and “fast technology” was established. This study has adapted the method of headspace solid-phase microextraction for the assay of trace trihalomethanes in water. The results suggest that this procedure is sensitive, practical, and convenient, with less contamination. This method is feasible for field sample examination.