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    ABSTRACT: Tetra- and pentachlorodibenzothiophenes (TCDT and P5CDT) and the sulfur analogues of tetra- and pentachlorodibenzofurans (TCDF and P5CDF) were identified along with polychlorodibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in tissues of crabs collected from the Newark/Raritan Bay system. The use of mass-profile monitoring of selected ions in capillary gas chromatography/high-resolution mass spectrometry (GC/HRMS) resulted in a preliminary identification of an isomer of TCDT and of P5CDT. Confirmation for this identification was accomplished by high-resolution peak matching and by acquiring a full spectrum by GC/MS. The accurate masses of three molecular ions, the full electron ionization (EI) mass spectrum, and the chromatographic retention time are all consistent with those of a 2,4,6,8-TCDT standard. Levels of 2,4,6,8-TCDT in the crab tissues are more than 5-10 times those of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD); the highest level (12 ppb) occurring in the hepatopancreas tissue of crabs taken from Newark Bay. A good correlation was found between the levels of 2,3,7,8-TCDD and 2,4,6,8-TCDT (r2 = 0.98) in the samples collected from four stations in the area, suggesting common sources of 2,4,6,8-TCDT and 2,3,7,8-TCDD.
    Environmental Science and Technology 08/1994; 28(8):1535-8. DOI:10.1021/es00057a024
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    ABSTRACT: Hepatopancreas and muscle tissues of crabs collected from the Newark/Raritan Bay system, New Jersey, were analyzed for polychlorodibenzo-p-dioxins and dibenzofurans (PCDD/Fs) by using capillary gas chromatography/high-resolution mass spectrometry (GC/HRMS) in the selected ion-monitoring, mass-profile mode. All hepatopancreas tissue samples were found to be contaminated with PCDD/Fs. Samples collected proximate to a former chemical manufacturing plant located on the Passaic River have the highest levels. The concentrations of PCDD/Fs decrease in animals taken at increasingly more remote sites from the alleged point source. The levels (up to 1 ppb) of 2,3,7,8-tetrachlorodibenzo-p-dioxin (2,3,7,8-TCDD) in hepatopancreas tissues of the crabs taken from Newark Bay are elevated by a factor of 5-10 times those of samples from Raritan Bay. Even the muscle samples from animals taken from Newark Bay have detectable levels of 2,3,7,8-TCDD, whereas those from Raritan Bay have ''no detectable'' levels of 2,3,7,8-TCDD (detection limit 0.5-1.0 ppt). The levels of 2,3,7,8-substituted pentachloro- and hexachlorodibenzofurans are approximate 10 times lower. No other PCDD/Fs were detected at a detection limit range of 5-45 ppt.
    Environmental Science and Technology 08/1994; 28(8):1528-34. DOI:10.1021/es00057a023
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