Kinetic Determination of Nanogram Amounts of Mo(VI) in Solution

Abstract

A new inhibitory reaction is proposed and a kinteic method developed for the determination of ultra‐micro amounts of Mo(VI) on the basis of its inhibitory activity in oxidation of trimethylenediamine ‐N,N,N′,N′‐tetraacetic acid (TDTA) by KMnO4 in the presence of hydrochloric acid. Under optimal conditions the sensitivity of the method is 0.5 ng/cm3. The probable relative error is 2.9–3.5% for the concentration range 7.5–2.0 ng/cm3 of Mo(VI). The effect of certain foreign ions upon the reaction rate were determined for the assessment of the selectivity of the method. The selectivity of the method is relatively good. Kinetic equations were proposed for the investigated process. A method has been applied for determination of Mo(VI) in a certain kind of steel.

Catalytic Spectrophotometric Determination of Titanium(IV) Using Methylene Blue‐Ascorbic Acid Redox Reaction

“…The method was applied to the determination of titanium in an aluminum alloy and a synthetic sample. 8 Kinetic methods [9][10][11][12] can be implemented on very simple, inexpensive equipment and provide low level determination comparable to those typically offered by much more expensive techniques such as inductively coupled plasma, atomic emission spectrometry (ICP-AES) 13 or electrothermal atomic absorption spectrometry (ETAAS). 14,15 In this paper we described a simple, sensitive, and highly selective catalytic method for the determination of titanium(IV) based on its catalytic effect on the redox reaction of methylene blue-ascorbic acid.…”