A QUANTITATIVE STUDY OF THE NI(II) AND MN(II) COMPOUNDS WITH O-HYDROXYBENZOPHENONES SUBSTITUTED BY EXTRACTIVE-POLAROGRAPHIC AND EXTRACTIVE-PHOTOMETRIC METHODS

The present study is devoted to the investigation of substituted o-hyd roxy-benzophenones as possible organic reactives with various applicat ions in analytic chemistry. From this class of compounds there have be en studied 2-hydroxy-5-metyl-benzophenone and 2-hydroxy-4-methoxy-benz ophenone, as possible extraction agents of the Ni2+ and Mn2+ ions from the aqueous solution. The authors have established the optimum parame ters and working conditions for attaining as high an extraction yield as possible (over 96%). Both reactives extract the Ni2+ ions, while Mn 2+ is extracted only by 2-hydroxy-4-methoxy-benzophenone. On consideri ng the properties of such organic ligands of forming soluble, coloured and extractible complexes with the metallic ions an extractive-photom etric method far the determination of Ni2+ with 2-hydroxy-5-methyl-ben zophenone has been proposed.