Uptake rates of semipermeable membrane devices (SPMDs) for PCDDs, PCDFs and PCBs in water and sediment

Uptake rates of several PCDDs, PCDFs and PCBs were measured for semipermeab le membrane devices (SPMDs) under controlled conditions in bulk water and s ediment. The study was performed at 19 degrees C and 11 degrees C, and wate r and sediment concentrations were measured during the exposure. Linear upt ake rates for specific PCDD/Fs and PCBs in 19 degrees C water varied from 3 4 to 111 l/m(2)day and in 11 degrees C water from 8.8 to 96 l/m(2)day for t he whole SPMD. Uptake rates at 19 degrees C sediment ranged from 9.0 to 80 mgOC/m(2)day and in 11 degrees C sediment, from 3.0 to 31, mgOC/m(2)day. Pa rtitioning of the compounds between membrane and lipid was also measured du ring the linear uptake phase. The membrane-lipid concentration ratios range d from 0.02 to 1.11 depending on the compound, temperature, and bulk medium . (C) 1999 Elsevier Science Ltd. All rights reserved.