关键词: 工作场所, 甲醛, 便携式气相色谱-质谱(GC-MS), 含量测定, 现场快速检测

Abstract:

In order to reflect the actual exposure level of workers to formaldehyde in the air of the workplace, and to solve the problems of the existing formaldehyde determination methods, such as time-consuming, difficult to capture the instantaneous concentration, and strong interference of coexisting substances, a rapid detection method of formaldehyde in the air of the workplace based on portable GC-MS was established. The portable GC-MS sampling handle was used to collect workplace air. After enrichment with a Tri bed adsorption tube in the equipment, thermal desorption analysis was directly performed. Retention time and characteristic ions were used for qualitative analysis, and the characteristic ion peak area internal standard method was used for on-site quantification. The technical parameters of the method were evaluated, and the stability and accuracy of the method were determined through interference experiments and comparison tests, and practical application research was conducted. The result shows that the linear range of formaldehyde detection by GC-MS is 0.10-12.3 mg/m³, the correlation coefficient is 0.999, the detection limit is 0.05 mg/m³, the lower limit of quantification is 0.10 mg/m³, the recovery rate of standard addition is 88.0%-97.6%, and the relative standard deviation (RSD) within the batch is 4.2%-9.1%. This method can realize the on-site rapid determination of formaldehyde concentration in the air of the workplace, and the deviation from the theoretical value is within 5%-12%, and it can accurately reflect the actual formaldehyde exposure of the staff, and provide an effective technical means for the occupational hazard risk assessment of formaldehyde in China.

Key words: workplace, formaldehyde, portable gas chromatography-mass spectrometry (GC-MS), content determination, on-site rapid detection