A high-selectivity spectrophotometric reagent for determining platinum(IV).

Area of Science:

• Analytical Chemistry
• Inorganic Chemistry

Background:

• Accurate determination of platinum is crucial for industrial applications.
• Existing methods for platinum analysis can be complex or lack selectivity.

Purpose of the Study:

• To synthesize and characterize a novel reagent for platinum(IV) detection.
• To develop a sensitive and selective spectrophotometric method for platinum(IV) determination.

Main Methods:

• Synthesis and structural confirmation of N-(m-Methylphenyl)-N'-(sodium p-aminobenzenesulfonate)-thiourea (MMPT).
• Spectrophotometric analysis of the chromogenic reaction between MMPT and platinum(IV).
• Validation of Beer's law and interference studies.

Main Results:

• MMPT forms a green soluble complex with platinum(IV) in an HAc-NaAc buffer.
• High molar absorptivities were observed at 754.4 nm (8.58 x 10^4 L.mol^-1.cm^-1) and 332.8 nm (1.14 x 10^5 L.mol^-1.cm^-1).
• The method demonstrated linearity for Pt(IV) concentrations from 0-1.28 mg/L (r=0.9995) with minimal interference from over 50 ions.

Conclusions:

• MMPT is a highly selective and sensitive reagent for platinum(IV) determination.
• The developed method is simple, rapid, and suitable for direct analysis of platinum in complex matrices like ores and catalysts.