关键词: 杉木, 木材干燥, 有机挥发物

Abstract: During Chinese Fir(Cunninghamia lanceolata)drying at a pilot-scale kiln,aldehyde was trapped in 2,4-DNPH solution and polar compounds were trapped in deion water and then analyzed by HPLC.Terpene was trapped on active carbon tube and analyzed by GC-FID.The results showed that the total volatile organic compounds(VOC)volume were 91.7 g·m^-3 and 29.9 g·m^-3 at 120 ℃ and 90 ℃,respectively.During kiln drying the major components in VOC were methanol,acetic acid,formic acid,acetaldehyde,formaldehyde,acrolein/acetone.The major terpine were α-pinene,D-limonene,camphene,β-pinene and β-phellandrene.The volume of aldehydes,methanol,acetic acid and formic acid emitted from drying at 120 ℃ was much higher than that emitted from drying at 90 ℃.But the total amount of terpine was almost the same at 120 ℃ and 90 ℃.The final moisture content of wood had significant influence on emission amount of aldehydes and polar volatile compounds.However,the final moisture content on the emission amount of terpine was not significant.The rate of formaldehyde emission increased gradually with the decreasing of moisture content(MC)for high temperature drying at 120 ℃,and the rate of other components decreased with the decreasing of MC.

Key words: Cunninghamia lanceolata, wood drying, volatile organic compounds(VOC)