Bioaccumulation of polybrominated diphenyl ethers by Tubifex Tubifex
Kolar, Boris, 1960- ...
Maloščetinci selektivno privzemajo polibromirane difenil etre (PBDE), kar omogoča vrednotenje bioakumulacije posameznih kongerjev kot tudi njihovih komercialnih mešanic. Na maloščetincih vrste Tubfex ...tubifex smo v skladu s tehničnim navodilom OECD 315 "Bioaccumulation in Sediment-Dwelling Benthic Oligochaetes" testirali 21 BDE kongerjev iz treh komercialnih mešanic (TBDE-71, TBDE-79 in TBDE-83R) ter kot posamezne kongenerje (BDE-77, BDE- 126, BDE-198 in BDE-204). Vse kongenerje, ki smo jih vmešali v sediment, smo v organizmih zaznali na kocu privzemne faze kot tudi ob koncu poskusa. Izračunali smo bioakumulacijski faktor (BAF), kinetični bioakumulacijski faktor (BAFK) ter normalizirani bioakumulacijski faktor (BSAF) ter ugotovili visok bioakumulacijski potencial za tri do heksa BDE in nižji bioakumulacijski potencial za hepta- do deka-BDE. Penta homologa BDE-99 in BDE-100 sta izkazala najvišje vrednosti BSAF in sicer 4,84 in 5,85 ob vrednostih BAF 7,34 oziroma 9,01, medtem, ko je bila bioakumulacija nona in deka BDE kongenerjev približno desetkrat ni`ja. Ta sprememba bioakumulacijskega potenciala med skupinama tri do heksa BDE in hepta- do deka-BDE se ujema s splošno sprejeto mejo 700 g/mol, ki velja za molekulsko maso ob prehodu bioloških membran.
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