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Emission of volatile aldehydes and ketones from wood pellets under controlled conditions.

The Annals of occupational hygiene (2009-08-12)
Mehrdad Arshadi, Paul Geladi, Rolf Gref, Pär Fjällström
ABSTRACT

Different qualities of biofuel pellets were made from pine and spruce sawdust according to an industrial experimental design. The fatty/resin acid compositions were determined by gas chromatography-mass spectrometry for both newly produced pellets and those after 2 and 4 weeks of storage. The aldehydes/ketones compositions were determined by high performance liquid chromatography at 0, 2, and 4 weeks. The designs were analyzed for the response variables: total fatty/resin acids and total aldehydes/ketones. The design showed a strong correlation between the pine fraction in the pellets and the fatty/resin acid content but the influence decreased over storage time. The amount of fatty/resin acids decreased approximately 40% during 4 weeks. The influence of drying temperature on the aldehyde/ketone emission of fresh pellets was also shown. The amounts of emitted aldehydes/ketones generally decreased by 45% during storage as a consequence of fatty/resin acid oxidation. The matrices of individual concentrations were subjected to multivariate data analysis. This showed clustering of the different experimental runs and demonstrated the important mechanism of fatty/resin acid conversion.

MATERIALS
Product Number
Brand
Product Description

Supelco
2-Ethylhexanal, analytical standard
Supelco
LpDNPH S10 Cartridge, bed wt. 350 mg, volume 3 mL, pkg of 50 ea