Use of some hydrazine derivatives for the separation of mercury(II) from aqueo solutions by flotation technique

178-182Some hydrazine derivatives viz: pyridinium chloride acetylhydrazine (PAH), l-acetylpyridinium chloride-4-phenylthiosemicarbazide (APPT), l-acctylpyridinium chloride-o-hydroxyacetophenone hydrazone (APHH), trimethylammonium chloride acetylhydrazine (TAH), l-acetyltrimethylammonium chloride-o-hydroxyacetophenone hydrazone <span style="mso-bidi-font-family: Arial;mso-bidi-language:HI">(ATHH) and l-acetyltrimethylammonium chloride diacetylmonoxime hydrazone (ATDH) are investigated as floating agents for the separation of mercury (II) using oleic acid surfactant. Of these, APPT is the most suitable for giving maximum floating efficiency(~100%). Surfactant, metal ion and ligand concentrations, ionic strength, foreign ions. <span style="mso-bidi-font-family: Arial;mso-bidi-language:HI">p<span style="mso-bidi-font-family:Arial; mso-bidi-language:HI">H and temperature are examined as important parameters affecting the floatability of Hg(II). The procedure is successfully applied to recover Hg(ll) from some natural water samples with a relative standard deviation of 1.6%. Moreover, the mechanism of flotation is suggested based on some physical and chemical studies on the solid complexes isolated from aqueous and scum layers. </span