Chemical Characterization of HC (Hexachloroethane) Smoke Pot Residue

摘要

The objective of this research was the chemical characterization of residues from hexachloroethane (HC) smoke pots generated using several ignition scenarios under field conditions. Two trials were conducted: the first examined the spatial distribution of organic and inorganic compounds in the smoke pot residue, and the second examined the effects of burn scenario (number of smoke pots and pot orientation) on the compositions of smoke pot and deposited residues. In the first trial, core samples were taken near the edges of the smoke pot and in the center. The samples were divided into subsections representing the bottom, middle, and top. Chemical analysis showed that the residue, representing 17-23% of the original mass, was primarily aluminum oxide, carbon, zinc chloride, and iron oxide, across sections but not depths, whereas cadmium concentrations differed by section and depth. In the second trial, single or double smoke pots were ignited upright or on their sides. Smoke pot residue compositions were little affected by either the number of smoke pots or their orientation, although these did affect the quantity and composition of deposited material. The mass deposited by an upright pot was 6-8 times the mass deposited by a pot on its side. However, the concentrations of inorganics and organics were higher in residues deposited from horizontally-fired smoke pots.