Optimization of sampling parameters for VOCs/VVOCs adsorption tubes for laminate flooring
[Objective]Optimization of the sampling and ageing conditions of adsorption tubes to improve the accuracy of their sampling and detection of VOCs and VVOCs.[Method]The laminate wood flooring was placed in a domestic test micro chamber for 8 h.The standard environment(temperature 23±1℃,relative humidity 40%±5%)was set,and the Tenax TA sorbent tube and the sorbent tube filled with Carbopack C,Carbopack B and Carboxen 1000 mixed sorbents were used to control different sampling flow rates and sampling volumes to sample the gases released from the laminate wood flooring in the chamber.The sampled gases from the laminate flooring were sampled and the sampled sorbent tubes were put into a gas chromatograph-mass spectrometer(GC/MS)for detection.In addition,2 L of gas was collected at a sampling flow rate of 150 mL·min-1 for the laminate flooring,and nine aging conditions were designed using an orthogonal test,and the sampled sorbent tubes were aged and detected by GC/MS.[Result]The gas components collected by two adsorption tubes accounted for the largest proportion of aromatics and the smallest proportion of esters.91.1%,8.9%and 59.5%,40.5%of the total sampled concentrations of TVOC and TVVOC were sampled in the Tenax TA adsorption tube and CB-1000 hybrid adsorption tube,respectively.The aging results showed that the residual concentration of compounds in the Tenax TA sorbent tube was 22.89 μg·m-3 at an aging time of 45 min,an aging flow rate of 100 mL·min-1,and an aging temperature of 310 ℃.The CB-1000 hybrid sorbent tube had a residual concentration of 27.16 μg·m-3 at an aging time of 45 min,an aging flow rate of 150 mL·min-1,and an aging temperature of 310 ℃.[Conclusion]The recommended sampling conditions for the two adsorbent tubes were a sampling flow rate of 150 mL·min-1 and a sampling volume of 2 L.The Tenax TA adsorbent tube is more suitable for the detection of VOCs,and their sampling concentration was mainly affected by the sampling volume.The CB-1000 adsorbent tube is more suitable for the detection of VVOCs,and its sampling concentration is mainly affected by the sampling flow rate.The recommended aging conditions for Tenax TA adsorbent tubes are aging time of 45 min,aging flow rate of 100 mL·min-1,and aging temperature of 310 ℃;and for CB-1000 hybrid adsorbent tubes,the recommended aging conditions are aging time of 45 min,aging flow rate of 150 mL·min-1,and aging temperature of 350 ℃.
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