00000nam 2200000za 4500 9.846158 CaOODSP 20241203113640 cr ||||||||||| 171026s1996 onca|||fo f000 0 eng d CaOODSP eng eng fre n-cn--- En13-5/96-157E-PDF Comparison of direct sediment bioassay results with sediment extract results in preserved sediments [electronic resource] / B.J. Dutka ... [et al.]. Burlington, Ont. : National Water Research Institute, 1996. 8, [2] p. : ill. NWRI contribution ; 96-157 "January 1996". Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references. "Complete and unequivocal preservation of samples, whether domestic wastewater, industrial wastes, natural waters or sediments for microbiological or bioassay testing, is a practical impossibility. Realizing the problem, the effects of freezing and thawing on sediments as they relate to bioassay results were investigated by incorporating this preservation feature into a study designed to evaluate the relative sensitivities of direct sediment bioassays and bioassays performed, on sediment extracts and the relative toxicant/genotoxicant load of inlet and outlet sediments at three Toronto area stormwater ponds. The bioassay responses to stored sediments were very bioassay specific as two bioassays supposedly measuring similar effects often produced diametrically opposite results. The superior sensitivity of the direct sediment SOS-Chromotest procedure over genotoxjcity tests performed on sediment extracts is well illustrated in this comparison study"--Abstract. Abstracts in English and French. gccst Pollution gccst Water quality Canada. Environment Canada. National Water Research Institute (Canada) NWRI contribution ; no. 96-157 (CaOODSP)9.844121 PDF 1.28 MB https://publications.gc.ca/collections/collection_2017/eccc/En13-5-96-157-eng.pdf