Anti dp

All solvents used in this study were of HPLC grade or higher, obtained from Fisher Scientic (Loughborough, UK). Individual stock standard solutions of natives, internal standards, and recovery determination standards (PBDEs -28, 47, 99, 100, 153, 154, 183, 209, 77, 128, 13 (link) C-BDE-100, 13 (link) C-BDE-209, a-HBCDD, b-HBCDD, g-HBCDD, 13 (link) C-a-HBCDD, 13 (link) C-b-HBCDD, 13 (link) C-g-HBCDD, d 18 -g-HBCDD, DBDPE, anti-DP, syn-DP, HBBz, PBBz, PBEB, and PBT) were purchased from Wellington Laboratories (Guelph, ON, Canada). PCBs -11, 14, 28, 29, 34, 52, 62, 101, 118, 119, 129, 138, 147, 153, 173, and 180 were bought from Greyhound Chromatography (Birkenhead, Merseyside, UK). Pesticide grade orisil (60-100 mesh) and concentrated sulfuric acid, were purchased from Acros Organics (Geel, Belgium) and Sigma-Aldrich (St. Louis, MA, US) respectively.

Reference solutions of native syn-Dechlorane Plus (DP), anti-DP, Dec-601, -602, -603 and Chlordene Plus (CP) were purchased from Wellington Laboratories (Guelph, Ontario, Canada).
Reference solutions of 13 C 10 -labelled syn-DP, anti-DP, Dec-602 (internal standards, IS) and 13 C 12 -PCB-194 (recovery standard) were provided by Cambridge Isotope Laboratories (Andover, MA, USA) and used according to the isotopic dilution analysis. Working solutions were prepared at 1 ng.µL -1 in toluene and stored at -20 °C. Silica gel (70/230 mesh) was obtained from Fluka (Buchs, Switzerland), sodium sulphate from Merck (Darmstadt, Germany). Sulphuric acid (98%) was purchased from Panreac (Barcelona, Spain) and 1 N sodium hydroxide from Reagecon (Clare, Ireland). Toluene, acetone, ethyl acetate, cyclohexane and n-hexane were provided by LGC Promochem (Picograde®, Wesel, Germany) and dichloromethane by Biosolve (Valkenswaard, The Netherlands).