Chapter 10 Membrane-enclosed sorptive coating for the monitoring of organic compounds in water

Abstract

Publisher Summary This chapter presents an overview of theoretical aspects and design of the different membrane-enclosed sorptive coating (MESCO) sampler formats for water monitoring such as: polydimethylsiloxane (PDMS)-coated fiber enclosed in an low-density polyethylene (LDPE) membrane, PDMS-coated stir bar enclosed in a dialysis membrane bag (MESCO I), and Silicone material enclosed in an LDPE membrane (MESCO II). It summarizes the efforts to calibrate the samplers for several priority pollutants in laboratory studies and to test them under field conditions. The performance of the PDMS-coated fiber in LDPE membrane bag was tested by time-dependent exposure in a flow-through system at 19°C. The sampling rates obtained have been tabulated. MESCO I samplers were also tested in this flow-through apparatus. Due to its much larger sampling capacity, the standard semipermeable membrane device (SPMD) has up to five orders of magnitude higher sampling rates than the MESCO formats tested. Further flow-through calibration experiments showed that the sampling rates in MESCO I were not significantly affected by the flow velocity, within the tested range of exposure conditions.