Low-Temperature Sorption–Luminescence Determination of Platinum Using Silica Chemically Modified with N-Allyl-N"-Propylthiourea and N-Phenyl-N"-Propylthiourea.

Autor: Losev, V., Bartsev, V., Kravtsov, I., Trofimchuk, A.
Zdroj: Journal of Analytical Chemistry; May2001, Vol. 56 Issue 5, p433-436, 4p
Abstrakt: Silicas chemically modified with N-allyl- N"-propylthiourea and N-phenyl- N"-propylthiourea were proposed for the low-temperature sorption–luminescence determination of platinum. The sorption of platinum(II) and platinum(IV) at the surface of sorbents yields coordination compounds luminescing at 77 K under UV irradiation. Luminescence spectra of platinum(II) complexes of thiourea derivatives covalently bonded to the silica surface exhibit a broad structureless band with a maximum at 585 nm. For the sorbent with N-allyl- N"-propylthiourea groups, the detection limit of platinum is 0.1 μg per 0.1 g of the sorbent. The calibration plot is linear up to 50 μg/0.1 g. The detection limit and the linearity range of calibration plots depend on the mass of the sorbent. The proposed procedure was used for the analysis of aluminoplatinum catalysts. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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