期刊
ANALYTICAL METHODS
卷 8, 期 2, 页码 362-370出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ay02523k
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资金
- Jiangsu province Natural Science Foundation of China [BK20131271]
- National Hightech R&D Program of China [2013AA06A309]
Halonitromethanes (HNMs) are a class of halogenated nitrogenous disinfection by-products (N-DBPs) in drinking water which possess health concerns due to their potentially higher toxicity than regulated disinfection by-products (DBPs). A cold on-column (COC) injection in track-oven mode coupled with a gas chromatography-mass spectrometry (GC-MS) system for the analysis of HNMs has been developed. Comparative experiments showed that COC had an advantage over the conventional split/splitless injection in minimizing thermal degradation of HNMs, especially dibromochloro-and tribromonitromethanes in water. Both debromo-and denitro-products of HNMs were observed in the splitless injection mode at 117 degrees C and 170 degrees C. Liquid-liquid extraction (LLE) and solid phase extraction (SPE) procedures were compared for sample pretreatment. LLE showed good recoveries of 73-91% for all nine HNMs. In comparison, SPE provided a similar recovery range for four commonly detected HNMs in drinking water: dichloronitromethane, trichloronitromethane, bromochloronitromethane and dibromonitromethane in drinking water, while the recoveries of the other HNMs were below 50%. This indicated that the SPE-COC-GC-MS method can be a good alternative to LLE-COC-GC-MS for the identification and quantification of the four HNMs commonly present in tap water due to the simplicity of the SPE pretreatment technique.
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