determination of ultra trace amount manganese (ii) 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 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 conditions of 0.2 moll-1 sulfuric acid, 1.0 × 10-4 moll-1, 1 - (2 - pyridylazo) - 2 - naphthol, (pan), 1ml of potassium bromate 0.11 mol l-1 at 35oc, calibration graph in the rang of 0.001-0.06 μg ml-1 manganese (ii). concentration was obtained with detection limit of 0.23 ng ml-1 by the fixed-time method of 4.5 min. the relative standard deviation for 0.05μg ml-1 manganese(ii) is %90. no serious interference was identified. the applicability of the method was demonstrated by the determination of the manganese (ii) in water, vegetables and blood samples.
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عنوان ژورنال:
journal of physical & theoretical chemistryISSN
دوره 11
شماره 3 2014
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