A method is described for determining the course of inhibition curves substantiating the influence of some inorganic (Cr (VI)) and organic substances (phenol, synthetic tanning agents) on respiratory activity of heterogeneous biomass (activated sludge). Presented results prove that calculated inhibition curves have the course of a normal distribution function.Zusammenfassung: Es wird eine Methode zur Bestimmung des Verlaufs von Hemmkurven beschrieben und der EinHulJ einiger anorganischer (Chromat -Cr(V1)) und organischcr (Phenol, synthetische Gerbstoffe) Stoffe auf die Atmungsaktivitat einer heterogenen Biomasse (Belebtschlamm) dargestelll. Die aufgefiihrten Ergebnisse zeigen, da0 die berechneten Hemrnkurven statistisch normalverteilt sind. Acta hydrochim. hydrobiol. 25 (1997) 3 m-VCH Verlagsgesellschaft mbH, D-69451 Weinheim, 1997 0323-4320/97/0305-0141 $ 17.50+.50/0 m m Acta hydrochim. hydrobiol. 25 (1997) 3 m-
This study deals with the identification of individual n-alkylpolyoxyethylene glycols among the products of oxyethylenation of n-nonyl- and n-decylalcohol and with the identification of these compounds in the reaction mixture after their biodegradation. The individual glycols were identified by their retention indices for the column temperature programmed linearly, by the correlation of the retention indices with the number of oxyethylene groups in the molecule and by increments of retention indices for the incoming oxyethylene group or methylene group. The biodegradation process of oxyethylenation products of reaction of one mole of n-nonylalcohol and n-decylalcohol, respectively, with three moles of ethylene oxide was studied. n-Alkylpolyoxyethylene glycols in oxyethylenation products or their residues isolated from the aqueous solution after their biodegradation processes were derivatized into acetates, trifluoroacetates and trimethylsilyl derivatives before carrying out their identification and determination.
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