Room temperature phosphorescence optosensing for gadolinium.

An optosensing method for gadolinium based on the room-temperature phosphorescence behavior in aqueous solution induced by the transient adsorption of the complex formed by 1,4- bis (1′-phenyl-3′-methyl-5′-pyrazolone-4′-)butanedione (1,4) with Gd (III) on the chelating resin Chelex 100 (packed in a flow cell) is proposed. The proposed optosensing is satisfactory for the determination of the gadolinium ion in the range 8 × 10^–7−5 × 10⁻⁵ M with a correlation coefficient of 0.995. The relative standard deviation was 2.0% for determination of 5× 10⁻⁶ M gadolinium ion ( n = 10). The response mechanism of the optosensing and the interferences of other lanthanide ions were also investigated. The method has been used to determine gadolinium ion in synthetic sample. [ABSTRACT FROM AUTHOR]