Samarium(III)-Selective Electrode Using Neutral Bis(thiaalkylxanthato)alkanes
1996; American Chemical Society; Volume: 68; Issue: 2 Linguagem: Inglês
10.1021/ac950814b
ISSN1520-6882
AutoresDidarul A. Chowdhury, Takashi Ogata, Satsuo Kamata, Kousaburo Ohashi,
Tópico(s)Electrochemical sensors and biosensors
ResumoSamarium(III)-selective electrodes constructed on the basis of bis(alkylxanthato)alkanes and bis(thiaalkylxanthato)alkanes are described. As a class, both types of compounds showed quantitative responses toward Sm(III) ion. Among the ionophores tested in this work, the neutral carrier, 1,4-bis(3-thiapentylxanthato)butane, provided an ion-selective electrode almost ideal for determination of Sm(III) in aqueous solution. This electrode exhibits a Nernstian slope of 20 mV per concentration decade, with a detection limit of 5.0 × 10-7 M Sm(NO3)3. Acceptable selectivity was obtained for Sm(III) determination against many of the transition, alkali, alkaline-earth, and some of the lighter rare-earth metal ions. Only Cu(II) and Fe(III) interfere seriously.
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