Determination of 3 Acrylic Esters in Waste Gas from Stationary Pollution Source by Gas Chromatography-Mass Spectrometry with Activated Carbon Adsorption and Dichloromethane Desorption

To achieve low-cost and accurate determination of acrylic esters in waste gas samples from stationary pollution source, the method mentioned by the title was proposed by optimizing testing conditions including adsorbent, desorption solvent, desorption time, and chromatographic column. Samples were collected for 40 min at flow rate of 0.5 L·min^-1 using activated carbon gas sampling tube. Then, 1.00 mL of dichloromethane and 0.020 mL of 100 mg·L^-1 methyl methacrylate-d₈ internal standard solution were added, followed by desorption at room temperature for 30 min. The desorption solution was passed through a 0.22 μm filter membrane, and the filtrate was introduced into gas chromatograph-mass spectrometer. Three acrylic esters, including methyl acrylate, methyl methacrylate, and n-butyl acrylate, were separated on DB-624 column using temperature program condition, ionized by electron impact ion source, detected in selected ion monitoring mode, and quantified using the internal standard method. It was shown that the linear range of the standard curves for the 3 acrylic esters was 0.200-50.0 mg·L^-1, with the same detection limit (3.143s) of 0.003 mg · m^-3. Spike recovery tests at 3 concentration levels using nitrogen as the base gas were conducted, giving recoveries in the range of 85.2%-115%, and RSDs (n=6) of the determined values ranged from 10% to 20%.