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Appendix 1: Screening studies of POPs in bottom sediments from the Paz watercourse Table 1.7 QA/QC DATA REPORT fo r Polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans in sediment Compound Proce-dural Blank PBS 02, ng Method Detection Limit, ng/kg Spiked B lank Sample SMS 02 Detected, n g Added, ng % Recovery 2,3,7,8-TCDD n. d. 2.00 0.04 0.04 89 1,2,3,7,8-PeCDD n. d. 0.20 0.17 0.20 87 1,2,3,4,7,8-HxCDD n.d. 0.05 0.17 0.20 84 1,2,3,6,7,8- HxCDD n.d. 0.05 0.17 0.20 85 1,2,3,7,8,9- HxCDD n.d. 0.05 0.15 0.20 76 1,2,3,4,6,7,8-HpCDD n.d. 0.05 0.14 0.20 72 OCDD n. d. 0.05 0.34 0.40 84 2,3,7,8-TCDF n. d. 0.10 0.04 0.04 96 1,2,3,7,8-PeCDF n. d. 0.10 0.16 0.20 78 2,3,4,7,8-PeCDF n. d. 0.10 0.20 0.20 99 1,2,3,4,7,8-HxCDF n.d. 0.05 0.15 0.20 77 1,2,3,6,7,8- HxCDF n.d. 0.05 0.17 0.20 85 2,3,4,6,7,8-HxCDF n.d. 0.05 0.16 0.20 80 1,2,3,7,8,9-HxCDF n.d. 0.05 0.17 0.20 86 1,2,3,4,6,7,8-HpCDF n.d. 0.05 0.19 0.20 96 1,2,3,4,7,8,9-HpCDF n.d. 0.05 0.19 0.20 93 OCDF n.d. 0.05 0.32 0.40 79 Surrogate Internal Standards, % Recovery (13C12)2,3,7,8-TCDD 93 2.00 0.95 1.25 76 (13C j 2)2,3, 7,8-TCDF 100 0.10 1.05 1.25 84 (13C 12 ) 1 ,2,3,7,8-PeCDD 99 0.20 1.19 1.25 95 (13C 12 ) 1 ,2,3,7,8-PeCDF 90 0.10 0.94 1.25 75 (13C}2)1,2,3,6, 7,8- HxCDD 89 0.05 1.04 1.25 83 (13C j 2)1,2,3,6, 7,8- HxCDF 103 0.05 1.00 1.25 80 (13C u ) 1, 2,3,4,6,7,8-HpCDD 100 0.05 1.18 1.25 94 (13C j 2)1, 2,3,4,6,7,8-HpCDF 95 0.05 1.24 1.25 99 (13C j 2)OCDD 90 0.05 2.23 2.50 89 Rapport APN- 514.3665.01 43