Reference

Organochlorines in benthic invertebrates and sediments from the Dutch Wadden Sea; identification of individual PCB components

Organochlorines in benthic invertebrates and sediments from the Dutch Wadden Sea; identification of individual PCB components. Duinker, J. C.; Hillebrand, M. T. J.; Boon, J. P. (Neth.Chemicals with cas numbers 92-52-4 and 11096-99-4 also play role. Inst. Sea Res., Den Burg 1790 AB, Neth.). Neth. J. Sea Res., 17(1), 19-38 (English) 1983. CODEN: NJSRBA. ISSN: 0077-7579. DOCUMENT TYPE: Journal CA Section: 4 (Toxicology) Section cross-reference(s): 61 Concns. of organochlorines were detd. in Macoma balthica, Arenicola marina, Crangon crangon, and sediments from the Dutch Wadden Sea. Max. concns. of (total) PCB, g-HCH [58-89-9], and dieldrin (I) [60-57-1] were found in the western part; and a max. of HCB [118-74-1] in the eastern part. Concns. of PCB, DDD [72-54-8], and DDE [72-55-9] in sediment were correlated with the percentage of particles <50 mm. The relative contribution of each individual component to total PCB was very similar in Macoma and Arenicola and independent of the total PCB. The relative concns. of some components with structures facilitating metab. were lower in Crangon. The patterns of pentachloro- and higher chlorinated biphenyls were equal in Macoma, Arenicola, and sediments. Since these components are not found in soln., they must be taken up from sediment and food. The results agree with partitioning between body lipids and water as the dominant mechanism detg. concns. of persistent lipophilic contaminants in the animals. Partitioning with the ambient water may also det. the concns. in the sediment. .

Acetone-sensitized and non-sensitized photolyses of tetra-, penta- and hexachlorobenzenes in acetonitrile-water mixtures: photoisomerization and formation of several products including polychlorobiphenyls

Acetone-sensitized and non-sensitized photolyses of tetra-, penta- and hexachlorobenzenes in acetonitrile-water mixtures: photoisomerization and formation of several products including polychlorobiphenyls. Choudhry, Ghulam Ghaus; Hutzinger, Otto (Lab. Environ. Toxicol. Chem., Univ.Chemicals with cas numbers 75-05-8 and 28655-71-2 also play role. Amsterdam, Amsterdam 1018 WV, Neth.). Environ. Sci. Technol., 18(4), 235-41 (English) 1984. CODEN: ESTHAG. ISSN: 0013-936X. DOCUMENT TYPE: Journal CA Section: 61 (Water) Section cross-reference(s): 25, 67, 74 Photochem. reactions of tetra-, penta- [608-93-5], and hexachlorobenzenes [118-74-1] in the presence and absence of Me2CO [67-64-1] as sensitizer at wavelengths 3 285 nm were studied. The reductive dechlorination is the main photochem. pathway in both sensitized and nonsensitized photolyses. 1,2,4-Trichlorobenzene [120-82-1] appears as main photoproduct of the nonsensitized photolyses of 1,2,3,5-tetrachlorobenzene [634-90-2]; whereas the major photoproduct of the sensitized irradn. of this substrate is 1,3,5-trichlorobenzene [108-70-3]. The nonsensitized photoreactions of tetrachlorobenzenes yield photoisomerized chlorobenzenes and also give products chlorobenzenes contg. more Cl atoms than the starting material. Yields of up to several percent of polychlorobiphenyls (PCB's) are obtained in the case of sensitized irradn. of tetra- and pentachlorobenzenes, but this reaction is less significant in the case of direct photolysis. .