Determination of palladium in different samples by neutron activation after selective preconcentration with α-benzildioxime

✍ Scribed by H. Bem; D.E. Ryan

• Book ID: 104100480
• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 488 KB
• Volume: 169
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/s0003-2670(00)86209-1

✦ Synopsis

A procedure is described for the determination of submicrogram quantities of palladium in sea water, biological and geological materials. Palladium is preconcentrated by coprecipitation with a-benzildioxime at pH 2 in the presence of citric acid followed by neutron activation. The method is highly selective and only traces of other metals are adsorbed on the surface of the precipitate. The instrumental variant of counting of longlived lo9Pd (t,,, = 13.6 h) after 16-h irradiation gives a detection limit of 10 ng. A further decrease of the detection limit to 1 ng can be attained by removal of radioactive impurities (mainly "'Na, S6Mn and *'Br) after washing the dichloromethane extract of dissolved precipitate with an aqueous solution of citric acid containing inactive carriers of bromide, manganese and sodium ions. Palladium ( lo9Pd) is finally measured by a NaI(Tl) well type scintillation detector. The method can be applied to most environmental samples.