Spectrometric determination of platinum with methoxypromazine maleate
A simple, rapid, and sensitive spectrophotometric method has been developed for the determination of platinum in solution. The chromogenic reagent, methoxypromazine maleate, reacts with platinum(IV) almost instantaneously in phosphoric acid medium containing copper(II) catalyst to form a bluish pink 1:1 complex with an absorption maximum at 562 nm. The complexation is complete within 1 min. A 30-fold molar excess of the reagent over metal ion is necessary for completion of the reaction. Beer's law is obeyed over the concentration range of 0.4-9.8 ppm of platinum(IV) with an optimal range of 1.5-8.6 ppm. The molar absorptivity is 1.71 x 10/sub 4/ L mol/sup -1/ cm/sup -1/ and the Sandell sensitivity is 11.4 ng cm/sup -2/. The apparent stability constant of the complex is log K = 5.58 +/- 0.1 at 27/sup 0/C. The effects of acid concentration, time, temperature, concentration of the reagent and copper, order of addition of reagents, and the interferences from various ions are investigated. The method has been used for the determination of platinum in synthetic solutions that approximate the composition of some alloys and minerals. 25 references, 1 figure, 2 tables.
- Research Organization:
- Univ. of Mysore, India
- OSTI ID:
- 6314380
- Journal Information:
- Anal. Chem.; (United States), Vol. 56:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
PLATINUM
QUANTITATIVE CHEMICAL ANALYSIS
PLATINUM COMPLEXES
SPECTROPHOTOMETRY
EXPERIMENTAL DATA
METALS
PH VALUE
QUANTITY RATIO
SOLUTIONS
TEMPERATURE EFFECTS
TIME DEPENDENCE
CHEMICAL ANALYSIS
COMPLEXES
DATA
DISPERSIONS
ELEMENTS
INFORMATION
MIXTURES
NUMERICAL DATA
PLATINUM METALS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENTS
400104* - Spectral Procedures- (-1987)