AP1-4 - Society of Wood Science and Technology

Proceedings of the 55th International Convention of Society of Wood Science and TechnologyAugust 27-31, 2012 - Beijing, CHINAThen, analysis on the sample, elution the DNPH sampling tube with acetonitrile, thevolume of acetonitrile was 5ml, sample was detected and analyzed by HPLC. UsingTenax tube collected VOC, and using thermal desorption did the high temperaturethermal desorption ten minutes at 250℃, then detection by GC/M S.According to the peak retention time of three kinds of particleboard on the GC/MS andHPLC, comparing with the standard sample map, identified VOC components andcalculated concentration of each component.Some standards about using chamber test VOC regulated that the backgroundconcentration of individual target VOC and TVOC should not exceed 2μg/m 3 and20μg/m 3 respectively [4-6] . Before the test, washing the internal chamber with deionizedwater and bilwing dry with fan. We could start test when each parameter of chamber wasstable. During the sampling period, the gas orderly through activated carbon device,distill water, to remove the volatile compounds. The effect of background concentrationhad been removed in this experiment.Result and discussionAccordingly to JIS A 1901:2009 [6] , the range ofTVOC is between n-hexane and n-hexadecane with gas chromatography, including thetwo chemical substances. The calculated TVOC is converted to the sum of peak areasusing the toluene response factor, the concentration of TVOC was the sum of identifiedtarget VOC and unidentified VOC.Table 6 the result of VOC emission from wood-based panelsspecimen formaldehydeμg/m 3aldehydes and ketones(except formaldehyde) μg/m 3TVOCμg/m 3Time (day) 1 28 1 28 1 28Particleboard 140.8 98.3 111.1 22.4 100.8 20.8Plywood 311 117.5 58.6 30.7 19.8 11.8HDF 1541.3 1099.0 73.7 49.5 351.7 65.1Blockboard 41.83 20.33 5.45 2.55 2.69 1.54Table6 was the result of VOC emission from wood-based panels. From table2 we couldsee that the initial and steady-state concentration of all substance that emission from HDFwhich made of various kinds mixed polished wood fiber and urea-formaldehyde wereboth the highest in the four test boards, except the aldehydes and ketones initialconcentration. The TVOC release amount was 351.7μg/m 3 1 day later and that equaled to3.5 times of particleboard at the same time. One month later, the TVOC concentrationwas 65.1μg/m 3 , and the formaldehyde concentration decreased to 1099μg/m 3 from1541.3μg/m 3 (0.89ppm).In the other three kinds of boards, the initial and steady-state concentration of TVOC thatemission from particleboard production of softwood chips and urea-formaldehyde weremuch higher, correspondingly the formaldehyde concentration emission from plywoodPaper AP1-4 5 of 8