Volume 7,Issue 1
Benzene, Toluene, Xylene and Ethylbenzene in the Air of Workplace: Validation of Solvent Desorption Gas Chromatography
To ensure the applicability and reliability of the detection methods for benzene, toluene, xylene and ethylbenzene in the air of workplace under the conditions of our laboratory, the linear range, detection limit, quantification limit, desorption efficiency, precision and accuracy of the method were systematically verified according to the solvent desorption gas chromatography method in GBZ/T 300.66-2017 (5) determination of toxic substances in the air of Workplace Part 66: benzene, toluene, xylene and ethylbenzene. The results showed that the linear range of the benzene series was 0–25 µg/mL, and the correlation coefficients were ≥ 0.9993. The detection limits were 0.05–0.08 µg/mL, and the limits of quantification were 0.16–0.25 µg/mL. The average desorption efficiency of the activated carbon tube for the target compound is between 96.1% and 98.8%. The relative standard deviations (RSDs) within and between batches were less than 7.00% and 7.80%, respectively. The recovery was 96.7%–106.3%. The validation results showed that the performance indicators of the method met the technical requirements of GBZ/T 210.4-2008 guidelines for the formulation of Occupational Health Standards Part 4: methods for the determination of chemical substances in the air of workplaces, and could meet the actual needs of the laboratory for batch and efficient daily monitoring of benzene, toluene, xylene and ethylbenzene in the air of workplaces.
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