Spectrometric determination of platinum with methoxypromazine maleate

Journal Article · Wed Feb 29 23:00:00 EST 1984 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00267a012· OSTI ID:6314380

Thimmegowda, A; Sankegowda, H; Gowda, N M.M.

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), Journal Name: Anal. Chem.; (United States) Vol. 56:3; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104* -- Spectral Procedures-- (-1987)
CHEMICAL ANALYSIS
COMPLEXES
DATA
DISPERSIONS
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
METALS
MIXTURES
NUMERICAL DATA
PH VALUE
PLATINUM
PLATINUM COMPLEXES
PLATINUM METALS
QUANTITATIVE CHEMICAL ANALYSIS
QUANTITY RATIO
SOLUTIONS
SPECTROPHOTOMETRY
TEMPERATURE EFFECTS
TIME DEPENDENCE
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENTS