Catalytic Determination of Molybdenum by Means of the Sodium Perborate/Bromide/Ascorbic Acid Landolt Reaction Using Potentiometric Measurements

A new catalytic method for the determination of 0.1-10 ppm molybdenum is described. Molybdenum catalyses the perborate - bromide ascorbic acid Landolt reaction at pH 3.64. The rate is monitored by potentiometry. A calibration graph is based on the ratio of the reaction times for the blank and the sa...

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Veröffentlicht in:	Analytical letters 1992-06, Vol.25 (6), p.1111-1118
Hauptverfasser:	Shraydeh, Bassem F., Svehla, G.
Format:	Artikel
Sprache:	eng
Schlagworte:	400102 - Chemical & Spectral Procedures 540220 - Environment, Terrestrial- Chemicals Monitoring & Transport- (1990-) Analytical chemistry ASCORBIC ACID CATALYSIS Chemistry CONTAMINATION ECOLOGICAL CONCENTRATION Electrochemical methods ELEMENTS ENVIRONMENTAL SCIENCES Exact sciences and technology FOOD CHAINS INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY LAND POLLUTION Landolt reaction MEASURING METHODS METALS MOLYBDENUM NITROGEN FIXATION POLLUTION Potentiometric measurements POTENTIOMETRY Reaction times Sodium perborate SOILS TITRATION TRANSITION ELEMENTS VITAMINS
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Beschreibung
Zusammenfassung:	A new catalytic method for the determination of 0.1-10 ppm molybdenum is described. Molybdenum catalyses the perborate - bromide ascorbic acid Landolt reaction at pH 3.64. The rate is monitored by potentiometry. A calibration graph is based on the ratio of the reaction times for the blank and the sample, (t(o)/t(c), plotted against the concentration of molybdenum. Optimal conditions for the determination are discussed. Also the effect of various ions and ihterferences are described.
ISSN:	0003-2719 1532-236X
DOI:	10.1080/00032719208020063