title: The role of metals in dioxin formation from combustion of newspapers and polyvinyl chloride in an incinerator.
abstract: Newspapers impregnated with NaCl mixed with various chloride metals (CuCl2, MgCl2, MnCl2, FeCl3, NiCl2, and CoCl2) and electric wire coated with polyvinyl chloride (PVC) were combusted in a well-controlled incinerator. Exhaust gas samples collected at the outlet of the incinerator were analyzed for dioxins (PCDDs, PCDFs, and coplanar PCBs) by gas chromatography/mass spectrometry. The amount of total dioxins formed from newspaper samples ranged from 34.2 ng/g (with NaCl+CoCl2) to 67.0 ng/g (with NaCl+CuCl2). PCDFs composed 88-94% of the total dioxins formed in the exhaust gases. The highest levels of PCDF isomers obtained were Cl3-CDF from the sample with NaCl+CuCl2 (14.8 ng/g), Cl2-CDF from the sample with NaCl+MgCl2 (12.3 ng/g), and Cl(1)-CDF from samples with NaCl+MnCl2 (12.6 ng/g), with NaCl+FeCl3 (11.8 ng/g), and with NaCl+NiCl2 (13.3 ng/g), and with NaCl+CoCl2 (8.62 ng/g). The total of Cl4-8-CDDs comprised 76-88% of the total Cl1-8-CDDs. In particular, Cl7-CDDs had the highest levels except for the sample with NaCl+NiCl2. Total dioxins formed from samples of electric wire coated with PVC and PVC alone were 38.3 ng/g and 112 ng/g, respectively, suggesting that the presence of copper reduced dioxin formation.
authors.affiliation: Research Center for Material Cycles and Waste Management, National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba, Ibaraki 305-8506, Japan.
authors.forename: Akio
authors.initials: A
authors.lastname: Yasuhara
authors.forename: Yuuka
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Takeo
authors.initials: T
authors.lastname: Katami
authors.forename: Takayuki
authors.initials: T
authors.lastname: Shibamoto
mesh_terms: D004147:Dioxins / Q000032:analysis* / Q000737:chemistry*; D004560:Electricity; D017745:Incineration; D007536:Isomerism; D008670:Metals; D009524:Newspapers as Topic; D011143:Polyvinyl Chloride / Q000737:chemistry*
chemical_list: D004147:Dioxins; D008670:Metals; D011143:Polyvinyl Chloride