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  • Author or Editor: R. Radulescu x
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The thermal behaviour of organic heterocyclic pigments was investigated by thermogravimetry and differential thermal analysis. The thermal stabilities were determined in air and in the absence of air, at different heating rates. The obtained values were verified in the colouring processes of some polymers.

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A comparative study is presented on decontamination of the solutions containing226Ra(II), by applying coprecipitation of Ba(Ra)SO4 followed by flotation and selective adsorption on active carbon. The comparative study revealed the performances of separation by coprecipitation-flotation and the possibility of applying the selective adsorption on active carbon. Both methods ensure the decreasing of226Ra(II) concentration under the allowed limits, recommended by International Standards.

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