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This study explores the combined toxic effect of Mn(II) and resorcinol (0.01 n and 0.2 n) on duckweed (Lemna minor). During the acute experiments, the plants released electrolytes into the aquatic environment after 30 min of exposure to the toxicants, indicating a disruption of tissue permeability as a test response. The experiments showed that the toxicity of the equinormal mixtures of resorcinol and Mn(II) (0.2 n each) increased relative to their single solutions. This was observed both in the freshly prepared solutions and in the solutions stored for 20 h prior to the experiments. The change in the UV absorption spectra indicates that there was complexation or other interaction between resorcinol and Mn(II) at equinormal concentrations (0.01 n). At the Mn(II) : resorcinol ratio of 1:20 (0.01 n Mn(II) and 0.2 n resorcinol), the toxicity of the system to duckweed decreased compared to the separate effects of these substances. The results obtained highlight the importance of considering the interactions between heavy metals and phenolic compounds when assessing the quality of aquatic environments.

Influence of additives peroxyds dicumyl and benzoyl, and chemical - active connections urotropin and a product of interaction resorcinol (1,3-benzenediol) with urotropin (RU-1) on properties of compositions is investigated on the basis of secondary polythene. The method of FTIR -spectroscopy, DSC, by measurement of the contents of gel - fraction, a parameter of fluidity of compositions , carries out researches of their structural features, thermal, physical and mechanical properties, etc. [ABSTRACT FROM AUTHOR]

For the first time an influence of small additives of a modificator RU-1 on property of secondary polythene and its composites with a rubber crumb is investigated. Their structural features with the help of methods of FTIR-spectroscopy, X-REY analysis are investigated. Physicomechanical properties, character changes an index of fluidity of compositions, changes of the contents of gel-fraction at presence RU-1 are investigated. [ABSTRACT FROM AUTHOR]