期刊
ANALYTICA CHIMICA ACTA
卷 780, 期 -, 页码 46-54出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2013.03.069
关键词
Trimethylamine; Sorbent tube; Thermal desorption; Time of flight mass spectrometry
资金
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology (MEST) [2009-0093848]
Trimethylamine (TMA) is well-known for manifesting the odor of rotting fish and urine. The analysis of TMA in environmental samples generally suffers from low reproducibility and poor sensitivity. In this study, a technique for the quantitative analysis of gas phase TMA was developed using thermal desorption (TD)-gas chromatography (GC)-time of flight mass spectrometry (TOF-MS). This new approach yielded good linearity (R-2=0.9930), precision (RSE=1.59%), and high sensitivity with the method detection limit (MDL) of 51 pg, i.e., detection of 0.021 ppb of TMA at 1 L sample (limit of detection CLOD): 5.32 pg (0.002 ppb). This method was tested against gas samples collected from two representative sources of TMA: (I) rotten thornback fish and (2) cat urine-soaked clay. The concentration of TMA in these samples, when analyzed after treatment at varying dilution ratios, averaged 293 +/- 29.7 ppm (RSE=3.82%) and 74.1 +/- 5.78 ppb (RSE=3.19%), respectively. The feasibility of this approach, when tested with TD GC Quadruple (Q) MS, showed a good compatibility with moderately reduced sensitivity. The results of this study demonstrated that one can achieve highly reliable and reproducible analysis of TMA from environmental samples when using thermal desorption (for pretreatment) and detection (by the TOF or Q-MS system). (C) 2013 Elsevier B.V. All rights reserved.
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