Simple and Selective Method for Determination of Platinum with Tin(II) Chloride and Amides

Abstract

A new, simple, and selective method for rapid spectrophotometric determination of Pt is described. It is based on extraction of Pt(II)–SnCl₃ ⁻ complex with chloroform (CF) solution of amide, i.e., N‐alkylacetamide (alkyl = butyl to octyl). The value of apparent molar absorptivity of the complex (with four N‐alkylacetamides) lie in the range of (3.40–3.50) × 10⁴ L mol⁻¹ cm⁻¹ at λ_max 400–405 nm. The most sensitive compound, i.e., N‐butylacetamide (BAA) has been selected for the detailed studies. The detection limit (absorbance 0.007 more than thrice of standard deviation of the method) of the method is 40 ppb Pt. The types of the halide and amide in the extraction as well as spectral characteristics of the complex are discussed. The reaction mechanism involved in the extraction of the metal is described. The optimization of analytical variables for the determination of Pt is carried out. The method has been applied for the determination of Pt in the catalytic materials.

^#E‐mail: [email protected].

Keywords:

• Platinum analysis
• Extraction
• Spectrophotometry
• Tin(II) chloride
• Amides
• Catalytic material

Acknowledgment

We are thankful to the Council of Scientific & Industrial Research, New Delhi, the Volkswagen Foundation, Hannover and the Alexander von Humboldt Foundation, Bonn for granting financial support for this work. We are also thankful to the Parekh Platinum Ltd., Mumbai, India for donating the catalytic samples.

Notes

^#E‐mail: [email protected].