Vol.2, No 2, 2000 pp. 87 - 91
UDC 541.1+543.23

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KINETIC DETERMINATION OF PD(II)
BASED ON THE OXIDATION OF METHYLENE BLUE B BY AMMONIUM PERSULFATE IN THE PRESENCE OF Au(III)
Rangel P. Igov, Sofija M. Rančić, Todor G. Pecev
Department of Chemistry, Faculty of Science, University of Niš, 18000 Niš, Yugoslavia

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Abstract. A kinetic method is described for Pd(II) determination, based on its catalytic effect on the reaction of oxidation of methylene blue B by ammonium persulfate in the presence of Au(III). The probable relative error was determined for the concentration interval of 2.2?10-7 to 10.0?10-7 g/cm3 Pd(II). In ranges between 2.4 %, for the concentration of 7.8?10-7 g/cm3 Pd(II), and 6.0%, for the concentration of 2.2?10-7 g/cm3 Pd(II). Appropriate kinetic equation was formulated and the sensitivity of 3.3?10-8 g/cm3 Pd(II) was limited. Also, the effect of different ions upon the reaction rate was tested. The method was verified by Pd(II) determination in the alloy PtRhG, by both kinetic and ICP-AES method
Key words: kinetic method, Pd(II) determination.

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KINETIČKO ODREĐIVANJE P(II) NA OSNOVU OKSIDACIJE METILEN PLAVOG B AMONIJUM PERSULFATOM U PRISUSTVU Au(III) Opisana je nova kinetička metoda za određivanje tragova Pd(II) u rastvoru, na osnovu njegovog katalitičkog dejstva na oksidaciju metilen plavog B amonijum persulfatom u citratnom puferu u prisustvu Au(III) u reakcionoj smeši. Na osnovu izvedene kinetičke jednačine za optimalne uslove reakcije, osetljivost metode iznosi 3.3?10-8 g/cm3 Pd(II). Relativna greška metode određivana je u intervalu koncentracije od 2.2?10-7 g/cm3 do 10.0?10-7 g/cm3 Pd(II). Ona se kreće od 2.4 % za koncentraciju od 7.8?10-7g/cm3, do 6.0 % za koncentraciju od 2.2?10-7g/cm3 Pd(II). Metoda je proverena određivanjem Pd(II) u uzorcima legura PtRhG, uz paralelnu primenu ICP-AES metode kao komparativne metode, na iste uzorke.