Vol.2, No 4, 2002 pp. 209 - 213
UDC 541.1+543.23
KINETIC DETERMINATION OF ULTRAMICRO AMOUNTS
OF THIOCYANATE
Vladimir R. Igov, Ranko M. Simonović1,
Rangel P. Igov2
Hospital of Psychiatry, Niš, Serbia and Montenegro
1Faculty of Science, University of
Priština, Serbia and Montenegro
2Faculty of Science, University of
Niš, Serbia and Montenegro
Abstract. A kinetic method is suggested for determing traces of
thiocyanate on the basis of their activating effect on the Fe(III) catalysis
of oxidation of 4-amino-N,N-diethylaniline sulphate (ANNS) by hydrogen-peroxide.
The sensitivity of the method is 50 ng/cm3.
The probably relative error ranges beetwen 5,5-10,5% for concentration
interval 300-70 ng/cm3 NCS-.
Kinetic equation were proposed for the investigated process. The method
has relatively good selectivity.
Key words: thiocyanate, kinetic determination, 4 - amino - N,
N - diethylaniline sulphate
KINETIČKO ODREĐIVANJE ULTRAMIKRO
KOLIČINA TIOCIJANATA
Predložena je nova kinetička metoda za određivanje tragova tiocijanata
na bazi njegovog aktivatorskog dejstva na reakciju oksidacije 4-amino-N,
N-dimetilanilin sulfata vodonikperoksidom u prisustvu Fe(III) kao katalizatora.
Osetljivost metode iznosi 50 ng/cm3 NCS
-.
Verovatna relativna greška se kreće od 5,5 - 10,5% za interval koncentracija
od 300 - 70 ng/cm3 NCS-.
Predložene su kinetičke jednačine za proučavani proces. Metoda ima relativno
dobru selektivnost.
Ključne reči: tiocijanat, kinetičko određivanje, 4-amino-N,N-dimetilanilin
sulfat
