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Screening studies of PO P levels in bottom sediments from selected lakes in the P az watercourse Table of content 1 INTRODUCTION 5 2 AIM OF THE STUDY 5 3 QUALITY ASSURANCE PROJECT PLAN 5 4 SAMPLING PROGRAM 6 4.1 Sampling p ro cedu re 7 5 RESULTS AND DISCUSSION 8 5.1. Analyses 8 5.2. T race elements 9 5.3. Polycyclic a rom a tic hyd roca rbon s (PAHs) 10 5.4. P e rs is ten t O rg an ic Po llu tan ts (POPs) 14 5.4.1. Chlorinated pesticides 14 5.4.2. Polychlorinated biphenyls 16 5.4.3. Toxaphenes 20 5.4.4. Polybrominated diphenyl ethers (PBDEs) 20 5.4.5. Polychlorinated dibenzo-para-dioxins and polychlorinated 22 dibenzofurans (PCDDs/PCDFs) 22 6. TOXICITY OF CONTAMINANT MIXTURE 25 7. CONCLUSIONS/RECOMMENDATIONS 27 8. ACKNOWLEDGEMENT 28 9. REFERENCES 28 APPENDIX 1 31 Rapport APN- 514.3665.01 3