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
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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 chemistryجلد ۱۲، شماره ۴، صفحات ۲۹۷-۳۰۶
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