Flow Injection Analysis Spectrophotometric Determination of Platinum

Author： Patel Khageshwar Jaiswal Nitin Sharma Paresh Hoffmann Peter

ISSN： 0003-2719

Source： Analytical Letters, Vol.39, Iss.1, 2006-01, pp. : 197-205

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Abstract

A new, simple, rapid, and selective procedure for the flow injection analysis (FIA) spectrophotometric determination of platement (Pt) is described. The method is based on the color reaction of Pt(IV) with SnCl 2 in the HCl medium. The mixed surfactants, i.e., cetylpyridinium chloride (CPC)+triton X-100 (TX-100) are used to enhance sensitivity of the method. The value of apparent molar absorptivity in the term of Pt is (3.00)×10 3 L mol -1 cm -1 at absorption maximum, 405 nm. The detection limit (causing absorbance greater than 3×std. dev.) of the method is 150 ng/mL -1 . The optimum concentration range for the determination of Pt is 0.5–18 µg/mL -1 with slope, intercept and correlation coefficient 0.0086, -0.001, and +0.99, respectively. The sample throughput of the method is 120 samples/h -1 at the flow rate of 3.7 mL/min -1 . The composition of the complex, and the reaction mechanism involved are discussed. The effect of FIA and analytical variables on the determination of the metal is optimized. The method has been tested for the analysis of Pt to the catalytic materials.