Chlorine isotope evidence for the anthropogenic origin of tris-(4-chlorophenyl)methane
2010 (English)In: Applied Geochemistry, ISSN 0883-2927, E-ISSN 1872-9134, Vol. 25, no 9, 1301-1306 p.Article in journal (Refereed) Published
Compound-specific Cl-isotope analysis was performed on the persistent and bioaccumulating compound tris-(4-chlorophenyl)methane (4,4',4 ''-TCPMe, referred to as TCPMe in this study) to elucidate whether its main source is natural or anthropogenic. Blubber from the Baltic grey seal (Halichoerus grypus) was extracted by continuous acetonitrile partitioning, and the TCPMe was isolated from the extract by preparative-capillary gas chromatography. Chlorine isotope analysis was subsequently performed by sealed-tube combustion in conjunction with thermal-ionization mass spectrometry (TIMS). The delta Cl-37 of TCPMe was -3.5 +/- 0.5 parts per thousand, similar to the previously reported delta Cl-37 of technical grade p,p'-DDT (referred to as DDT in this study). The data is not consistent with a putative marine natural source of TCPMe, as enzymatic (biotic) production is reported to give values of delta Cl-37 < - 10 parts per thousand. The delta Cl-37-TCPMe data thus supports the hypothesis that TCPMe is produced as a byproduct during DDT synthesis and is released to the environment through the same pathways as DDT. It is also consistent with tris-(4-chlorophenyl)methanol as the primary biotransformation product of TCPMe.
Place, publisher, year, edition, pages
2010. Vol. 25, no 9, 1301-1306 p.
DIBENZO-P-DIOXINS; HUMAN BREAST-MILK; STABLE CHLORINE; MARINE MAMMALS; POLYCHLORINATED-BIPHENYLS; MASS-SPECTROMETRY; NATURAL FORMATION; BLUE MUSSELS; BALTIC SEA; COMPOUND
Research subject Applied Environmental Science
IdentifiersURN: urn:nbn:se:su:diva-50083DOI: 10.1016/j.apgeochem.2010.06.001ISI: 000281499200002OAI: oai:DiVA.org:su-50083DiVA: diva2:382199
authorCount :52010-12-302010-12-212010-12-30Bibliographically approved