Abstract：During the detection of volatile organic compounds (VOCs), the VOCs residues in the reagent blank should be reduced as low as possible, otherwise the intercept of calibration curves would be influenced, resulting in poor accuracy of low concentration samples. The purge and trap-gas chromatography/mass spectrometry was used for the detection of 58 VOCs in water samples. The pollution sources of VOCs in reagent blank were compared and discussed. The effects of densification of low concentration standard points and forced through origin of the calibration curves on the results of the calibraition curves, low concentration spiked sample of reagent blank (the mass concentration of addition were in range of 0.20-1.00 μg/L) and tap water were discussed. The results showed that: (1) There were pollution of chloroform, benzene, toluene, ethylbenzene, m/p-xylene, o-xylene, 1,2,4-trimethylene and naphthalene in laboratory air and one commercial distilled water for drinking. Relatively speaking, the pollution of benzene, toluene and xylene from air was serious, while the pollution of chloroform, ethylbenzene, m/p-xylene, o-xylene and cumene from the commercial distilled water was serious. (2) When the calibration curves were densified with low concentration points and forced through origin, and coupled with high purity helium blow off pretreatment for the commercial drinking distilled water, the concentration of VOCs residue in pure water could be reduced, thus the determination values of VOCs in reagent blank sample were obviously lower than the limits of detection of the method (0.2-0.5 μg/L). When the optimized method was employed, the measured mass concentration of chloroform was 21.69 μg/L, and the mass concentrations of other VOCs were in range of 0.00-1.25 μg/L. The spiked recoveries (with standard addition of 2.00 μg/L) and relative standard deviations (RSD, n=4) ranged from 76.5% to 126.0% and from 1.1% to 16.6%, respectively. The optimized method was simple and suitable for application.
吴悦, 赖永忠, 陆国永, 薛俊发. 对水体中挥发性有机物分析的空白污染来源及解决措施的探讨[J]. 冶金分析, 2023, 43(2): 14-22.
WU Yue, LAI Yongzhong, LU Guoyong, XUE Junfa. Discussion on the sources and countermeasures of blank pollution in determination of volatile organic compounds in water samples. , 2023, 43(2): 14-22.
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