Isomer Specific Analysis of Tetra- and Pentachloronaphthalene in Fly Ash and Halowax.
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概要
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All isomers of tetra- and pentachloronaphthalenes were identified on selected ion monitoring chromatogram. For tetrachloronaphthalenes (TeCNs), sixteen isomers were synthesized individually and the other isomers were obtained as several groups of definite isomers. For pentachloronaphthalenes (PeCNs), byproducts in TeCN synthesis were used for identification. Specific isomers were synthesized from commercial reagents by simple methods. The isomer compositions of TeCN and PeCN in fly ash sample from a municipal waste incinerator were determined by gas chromatography/mass spectrometry using capillary columns as follows; OV-1701, OV-225B and SB-Smectic. The isomers which have two chlorine atoms on pen- positions (1, 8- or 4, 5-) are less abundant than the other isomers except for 1, 3, 5, 7-TeCN in most cases. 1, 2, 3, 6, 7-PeCN isomer, which is related to strongly bioaccumulating 1, 2, 3, 5, 6, 7-hexachloronaphthalene, was the most abundant among pentachloronaphthalenes in this sample. The isomer composition was completely different from that in Halowax 1014, in which dominant isomers have chlorine atoms on 1- and 4- position.
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