This article is focused on bioassay evaluation of exposed SPMDs. Toxicity testing of SPMD extract is a suitable complementary parameter to chemical analysis. Vtox as an integrative parameter describing toxic properties of extract from membrane and thus a level of contamination of assessed ambient is presented here. Two examples of practical use of Vtox is demonstrated: a course of toxicity throw wastewater treatment plant with industrial inlets and increase of toxicity in surface water body caused by leakages of POPs from industrial plant.
 J.N. Huckins, J.D. Petty, H.F. Prest, R.C. Clark, D.A. Alvarez, C.E. Orazio, J.A. Lebo, W.L. Cranor, B.T. Johnson: A guide for the use of Semipermeable membrane devices (SPMDs) as samplers of waterborne hydrophobic organic contaminants, Columbia Environmental Research Center, New Haven Road, Columbia, 2000.
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