Abstract: Objective To establish a direct reading detection method for formaldehyde in the air of workplace. Methods The formaldehyde standard gas series with a certain concentration were prepared in the laboratory. The pumped formaldehyde analyzer is used for detection. The established method was applied to the determination of formaldehyde in the air of workplace. At the same time,the national standard method was used for field sampling and analysis. Results The detection limit of direct reading detection method of pump suction formaldehyde analyzer was 0.01 mg/m³. The lower limit of quantification was 0.17mg/m³. It has good accuracy and precision when formaldehyde concentration was 0.17-4.29 mg/m³. Under the influence of temperature,humidity and interfering substances,the accuracy was 95.51%-100.20%. After field verification,the relative deviation from the current effective spectrophotometric detection results was 2.50%-7.72%. Conclusion The pump suction formaldehyde analyzer can be used to determine the concentration of formaldehyde in the air of workplace,especially the quantitative analysis of formaldehyde in the air at the scene of sudden accidents.

Key words: Workplace, Air, Formaldehyde, Portable direct reading instrument