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Extractive Spectrophotometric Determination of Iron(III) with N -Hydroxy-N-p-chlornphenyl-N' -(2-methy 1)-pheny 1-p- Toluamidine Hydrochloride in the Presence of Thiocyanate

P. K. Sharma ; Department of Chemistry, Ravishankar University, Raipur, 492010 India
R. K. Mishra ; Department of Chemistry, Ravishankar University, Raipur, 492010 India

Puni tekst: engleski pdf 3.049 Kb

str. 87-91

preuzimanja: 116



A new method is proposed for the extraction and spectrophotometric
d etermination of microgram amounts of iron(III) at ppm
level using N-hydroxy-N-p-chlorophenyl-N' -2-methylphenyl-p-toluamidine
hydrochloride (hereafter indicated as HCPMPTH) and
potassium thiocyanate as a mixed complex. Iron(III) in 0.10-1.2
mol/dm3 hydrochloric acid medium forms a benzene extractable
orange-red complex with HCPMPTH in presence of thiocyanate.
The 1 : 1 : 2 (metal : reagent : thiocyanate) ternary complex shows
a sharp absorption maximum at 460 nm. The effective molar absorptivity
of the complex is 12565 dm3 mo1· 1 cm·1 with Sandell's
sensitivity for iron of 0.0044 ~tg cm· 2 • The method is simple, rapid
and highly selective and most of the common ions including Fe'+,
Moa+, W6+, Ni2+, Al3+, Zn2+, Cr3+ did not interfere.

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