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Flow-injection chemiluminescence determination of cobalt(II) and manganese(II)

✍ Scribed by Qingxiong Lin; Alfonso Guiraúm; Rosario Escobar; Francisco F. de la Rosa

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
526 KB
Volume
283
Category
Article
ISSN
0003-2670

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✦ Synopsis

Flow-injection analysis @IA) was applied to the determination of C&II) and Mn(II). The method is based on the measurement of metal-catalysed light emission from luminol oxidation by potassium per&late. The apparatus consists of a flow-injection analysis system with a flow cell formed by a spiral of transparent tubing suitable for chemlltinescence measurement. Potassium periodate, unlike hydrogen peroxide, which is the oxidant normally used in luminol chemiluminescence systems, ls very stable, gives a low baseline and does not generate bubbles in the tubes of the FIA system. The typical signal is a narrow peak, in which the height is proportional to the light emitted and hence to the concentration of metal ions. The detection limit of Co(B) is 0.01 ng ml-' and the linear range extends up to 12 ng ml-t; for Mn(II) these limits are 0.02 and 9 ng ml-', respectively. The optimum concentrations for the reagents are 10e3 M lumhtol in Na,CQ,-KOH buffer (pH 12.91 and 10e4 M KIO, in water. The optimum flow-rates are water 11.1 ml min-', lmninol2.5 ml mitt-' and KlO, solution 2.1 ml min-t. Interferences by several metal ions were examined.

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