In continuation of a publication on the behaviour of fluorotensides in aqueous solution there were tested four selected fluorotensides, among them a noniononic ethoxylated substance and three anion‐active substances, in two different equipment with respect to their biochemical degradability. The BOD5, the potassium permanganate consumption, the dry matter contents and the loss on ignition as well as the dehydrogenase test were used as parameters for judging the degradation behaviour. In all the four cases a high biochemical stability was found, so that they must be classified into the group C “biochemically not degradable or difficult to degrade” in agreement with the results found, according to the water pollutants catalogue.
Summary: Salmo gairdneri, Cyprincs carpio, Poecilia reticdata, Leuciscus idus melanotus, Asellus aquaticus, Ankistrodesmus falcatus and Monoraphidium grifjithii were exposed t o four growth regulating herbicides, four photosynthesis toxicants, lindane, an anionactive tenside, KCN and Na,[Cu(CN),] in standardized toxicity tests. The biochemical degradability of the substances was tested with activated sludge. In order t o test the possible effects in waters there should be used Salmo for the oligosaprobic zone. Poecilia as well as Ankistrodesmus and Monoraphidiurn provide reliable estimations for @-mesosaprobic waters. With respect to the longer-term permission of plant protection products, besides Salmo there can be recommended also Leuciscus.
SumnLary:The toxic effects of alkali cyanide, complex cyanide-containing heavy metal saltsas of iron, cadmium, copper, nickel and mercury-were invest,igat,ed according to standard methods with the aid of the test organisms Poecilia reticulnta (guppy) as well as t'he green alga Ankistrodesrnus faleatus (B-bis a-mesosaprobic). Since various complex compounds can be photolytically decomposed, also discontinuous light-dark phases were used. As discussed equilibrium calciilation~ have shown. inter alia also the pH-value is iriiportant' in t,he fish organisms used with different react,ions to ions and molecularly dissolred conipoimds. The resnlts are summarized in tables and gmphir representations, the substances investigakd being classified into groups witah "strong" and "high" toxic act'ions.
Summary: Four fluorotensides which are used mainly industrially are investigated with respect to their removability from waters. Since, in general, fluorotensides are difficult to remove or not at all removable biochemically, the effects of chemical or physicochemical treatment processes are tested. As the results represented in pictures and tables show, different modes of behaviour can be recognized with respect t o the respective purification effect for the investigated fluorotensides, partly among them. Flocculation with Al-and Fe-salts as well as chlorination and ozonization show only partial effects. But all the investigatedfluorotensides can be adsorptively eliminated by means of powder or granular active charcoal and adsorbent resin Wofatit Ebo.
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