Diallyldithiocarbamidohydrazine (Dalzin) as an analytical reagent determination of palladium and its separation from nickel, zinc and copper

✍ Scribed by N.K. Dutt; K.P. Sen Sarma

• Publisher: Elsevier Science
• Year: 1960
• Tongue: English
• Weight: 131 KB
• Volume: 23
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/s0003-2670(60)80121-3

✦ Synopsis

Dalzin has been used for the determination and separation of a number of metals 1. Further investigation has shown that palladium can be quantitatively precipitated from hot solutions by Dalzin at pH 3.1--4.5, while most of the common ions and other platinum metals remain in solution. Copper, mercury and silver interfere, but the interference of copper can be eliminated by complexing with EDTA and precipitating palladium at a pH below 4.5. Nickel and zinc can be determined in the filtrate alter raising the pH as usual.

EXPERIMENTAL

Chemicals used were all of A.R. quality. A palladium solution was prepared from palladium chloride (Johnson and Matthey) and standardized gravimetrically as palladium dimethylglyoxime, pH measurements were made with Philips pH meter.

Composition o/ palladium complex

Palladium was precipitated at pH ca. 4 by the method given below and the precip-