Formation of PCDDs and PCDFs during the combustion of polyvinylidene chloride and other polymers in the presence of HCl.
PVDC and three non-chlorinated polymers (PP, PET, and PA) were incinerated at 700-850 degrees C in a laboratory-scale quartz tubular furnace in the presence of HCl (ca. 500 ppm congruent with 0.8 mg/l), and the gas-phase formation of PCDD/Fs, their putative precursors and their homologue profiles were investigated. The addition of HCl had little or no apparent effect on the level of PCDD/Fs formation during PVDC combustion, and their homologue profiles were quite different from those of the three non-chlorinated polymers. With PVDC, O8CDD and particularly O8CDF were by far most prevalent, apparently as a result of the selective formation of the precursors. With each of the three non-chlorinated polymers, combustion at 800 degrees C or higher in the presence of HCl resulted in PCDD/Fs formation at levels equaling or exceeding those observed with PVDC. In trials made with one of them (PP) under the same conditions but using a large polymer sample (100 mg vs 20 mg in all other trials), the level of PCDD/Fs formation was far higher than with the smaller polymer samples, and thus demonstrated the importance of appropriate combustion conditions for polymer incineration.
Ohta
Minoru
M
Conference on Hygiene of Vinylidene Chloride Products, 1-14-7 Nishi-shimbashi, Minato-ku, Tokyo 105-0003, Japan. vdkyo@oak.ocn.ne.jp
Oshima
Shozo
S
Osawa
Naoki
N
Iwasa
Toshio
T
Nakamura
Tadashi
T
D001572:Benzofurans / Q000032:analysis*; D000072338:Dibenzofurans, Polychlorinated; D004147:Dioxins / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D006851:Hydrochloric Acid / Q000737:chemistry*; D017745:Incineration; D011143:Polyvinyl Chloride / Q000031:analogs & derivatives* / Q000737:chemistry*
D001572:Benzofurans; D000072338:Dibenzofurans, Polychlorinated; D004147:Dioxins; C029547:polyvinylidene chloride; D011143:Polyvinyl Chloride; D006851:Hydrochloric Acid