A comparative study of the toxicity and inhibitory effects of inorganic tin compounds on various biological subjects
1994
Fargasova, A. (Slovenska Technicka Univ., Bratislava (Slovakia). Katedra Zivotneho Prostredia)
The toxic and inhibitory effects of Sn2+ (SnCl2.H20) and Sn4+ (Na2SnO3) compounds were determined under standardized conditions on 4 biological subjects: Tubifex tubifex, Chironomus plumosus, Sinapis alba seeds and the alga Scenedesmus quadricauda. The mortality rates of Tubifex tubifex and Chironomus plumosus, the root growth inhibition of Sinapis alba seeds, and the inhibition of growth rates of Scenedesmus quadricauda were observed. Of the benthic organisms, Chironomus plumosus was more sensitive (LC50/96 h for Sn2+ was 3.6 mg.l** (-1) and for Sn4+ 3.0 mg.l** (-1)) to both tested compounds than Tubifex tubifex (LC50/96 h for Sn2+ was 30.0 mg.l** (-1) and for Sn4+ 27.5 mg.l** (-1)). For both of these subjects, no differences between the toxic effects of Sn2+ and Sn4+ ions were observed. Sinapis alba seeds exhibited low sensitivity to Sn ions (EC50/72 h for Sn2+ was 281.2 mg.l** (-1) and for the Sn4+ ion 416.9 mg.l** (-1)). Estimated EC50 values were high, especially for the Sn 4+ ion. Root growth was more inhibited when the Sn2+ ion was applied. For Scenedesmus quadricauda, the Sn4+ ion also had lower inhibitory effects on growth rates than the Sn2+ ion.
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