Atmospheric trace element abundances associated with slash burning Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6d5700706

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  • The atmospheric trace element abundances associated with slash burning have been measured by instrumental neutron activation analysis (INAA). On site ground level samples were collected during the slash burning season using high volume samplers and a cascade impactor. In addition to the air samples, soil, wood and ashed wood samples were collected for analysis. The abundances of up to 29 elements were determined in each of the samples. The results show the air particulate to be a mixture of upswept soil and wood ash. From the particle size analysis and the calculated enrichment factors, wood ash was shown to be the major source of the elements Br, Cl, Hg, Sb, Se, Zn, K and As. Of greatest interest is the high concentration of K associated with small particles. Laboratory ashing of wood samples at 500°C and 1100°C showed the elements Zn, Na, K, Se, Hg, Br, and Cl to be depleted from 70-95% at 1100°C relative to unburned wood.
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