Fig. 2. Laboratory processing scheme for field-deployed and quality-control polar organic chemical integrative sampler (POCIS) and semipermeable membrane device (SPMDs). GC-ECD, gas chromatograph electron capture detector; GC-MSD, gas chromatograph-mass selective detector; OC, organochlorine; PAH, polycyclic aromatic hydrocarbon; PCB, polychlorinated biphenyl; SEC, size exclusion chromatography; YES, yeast estrogen screen.