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
نویسندگان
چکیده
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.
منابع مشابه
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
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 optimumcondi...
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a new kinetic spectrophotometic method for the determination of trace amount manganese(ii) in tea real samples has been described based on it s the catalytic effect on the oxidations of 1 - (2 – pyridyl azo) - 2 - naphthol, (pan), by potassium bromated in sulfuric acid. the reaction is followed spectrophotometrically by measuring the decrease in the absorbance at 547.5 nm. under the optimum con...
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عنوان ژورنال:
journal of physical and theoretical chemistryجلد ۱۲، شماره ۴، صفحات ۲۹۷-۳۰۶
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