o:5697 Validation of the GCMS method for the determination of polychlorinated biphenyls congeners in soil and sediment samples en This paper presents the method for monitoring 7 PCB congeners (PCB 28, 52, 101, 118, 138, 153, and 180) from the US EPA priority, which can also be applied for quantification of PCB sums (28+31). The separation of the PCB 28 and PCB 31 was also examined. The GC-MS technique with the HP-5MS column and the accelerated solvent extraction (ASE) were applied. The accuracy and precision of the method were assessed as the recovery (R, %) of the spiked matrices and the relative standard deviation (RSD, %). The obtained recoveries for 17 spiked soil matrices (at the concentration level of 0.05 mg/kg) ranged from 73.8 % to 100.6 % and for spiked sediments from 80.2 % to 106.5 %. The RSD values ranged between 9.7 % and 15 % for soil and from 23 % to 33 % for sediment. The calculation of R and RSD were performed both for individual peaks as well as the sum of PCB (28+31). The recoveries of the certified reference materials (CRM) for soil and sediment were also calculated. The river sediment CRM recovery was in the range from 23.3 % (PCB 28+31) to 60 % (PCB 118) while recovery for soil CRM varied between 51.6 % for PCB (28+31) to 100.6 % for PCB 101. The z-score of the soil and sediment CRMs were in the satisfactory range ±2 for most PCB congeners. It was not possible to separate PCB 28 and PCB 31 for CRM soil. PCB 28, PCB 31, soil, sediment, ASE 1552099 10.1016/j.microc.2024.111761 1552101 0026-265X 2024-10-15T12:27:40.858Z 44 no 46 Tanja Nenin Jaroslav Černi Water Institute, Belgrade, Serbia 0000-0002-0053-4585 Anđelka Petković Jaroslav Černi Water Institute, Belgrade, Serbia person 0009-0006-0162-6920 Tatjana Mitrović Jaroslav Černi Water Institute, Belgrade, Serbia person 0000-0002-5991-1445 46 Jasna Čolić Jaroslav Černi Water Institute, Belgrade, Serbia 0000-0002-4407-1885 application/pdf 4730448 https://unilib.phaidrabg.rs/o:5697 no yes 1 1556225 2026-10-01 70 92000001 71A04 Microchemical Journal 207 111761 1 9 Elsevier Ltd., Amsterdam, Netherlands 2024 Received 28 March 2024; Received in revised form 20 September 2024; Accepted 23 September 2024; Available online 29 September 2024