determination of ultra trace amount chromium in water samples with the 1-(2-pyridylazo)-2-naphthol, (pan) by the bromate ion in sulfuric acid with kinetic spectrophotometric method

Authors

mohamad reza froudi jahromi

chemistry department, dashtestan branch, islamic azad university, dashtestan, iran samira zandifar

chemistry department, dashtestan branch, islamic azad university, dashtestan, iran ehsan pakdaman

chemistry department, islamic azad university, kangan branch, kangan, iran fatemeh tavakoli

chemistry department, islamic azad university, kangan branch, kangan, iran saideh bagheri

abstract

a new kinetic spectrophotometic method for the determination of trace amount chromium (iii) in teareal samples has been described based on it s the catalytic effect on the oxidations of 1 - ( 2 –pyridylazo ) - 2 - naphthol, (pan), by potassium bromated in sulfuric acid. the reaction is followedspec- trophotometrically by measuring the decrease in the absorbance at 469 nm. under the optimumconditions of0.2 moll-1 sulfuric acid, 1.0 × 10-4 moll-1, 1- ( 2 -pyridylazo ) - 2 - naphthol, (pan),0.01 moll-1 potassium bromate at 35oc, calibration graph in the rang of 0.001-0.06 ngl-1 chromium(iii). concentration was obtained with detection limit of 0.2303 g ml-1 by the fixed-time method of5.5 min. the relative standard deviation for 0.05angl-1 chromium (iii) is %90. no serious interferencewas identified. the applicability of the method was demonstrated by the determination of thechromium (iii) in water, vegetables and blood samples.

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Journal title:
journal of physical and theoretical chemistry

جلد ۱۲، شماره ۴، صفحات ۲۹۷-۳۰۶

Keywords
[ ' c h r o m i u m ( i i i ) ' , ' k i n e t i c ' , 1 , ' ( 2 ' , ' p y r i d y l a z o ) ' , 2 , ' n a p h t h o l ' , ' ( p a n ) ' , ' d e t e r m i n a t i o n ' , ' s p e c t r o p h o t o m e t i c ' ]

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