Abstract
The complex of molybdenum (VI) with stilbene-2,2’-disulfonic acid-4,4’’bis (azo-1’’)-3’’, 4’’ dioxybenzene (stillbazo) in the presence of a cationic surfactant cetylpyridinium chloride (CPCl) was studied spectrophotometrically. It was found that in the presence of CPCl, a mixed-ligand complex with a component ratio of 1:2:4 is formed. The effect of pH, time, temperature, the concentration of reagents, and CPCl in the formation of homogeneous ligand and mixed-ligand complexes were studied. The stability constants (lgβk = 86 × 108) and the molar absorption coefficient of the mixed-ligand complex (εк = 11,835) were determined. It was found that Beer’s law is observed at a concentration of 0.05 - 17.00 μg/ml. A method has been developed for the spectrophotometric determination of molybdenum (VI) in complex industrial facilities.
Highlights
Polyfunctional azopyrocatechols are typical and valuable reagents for the spectrophotometric determination of metal ions [1] [2]
The aim of this work is to study the complexation of Mo (VI) with stillbazo in the presence of a cationic surfactant (CPCl) and use the data obtained for the development of a selective and sensitive spectrophotometric method for the determination of molybdenum (VI)
It was found that the maximum absorption of the reagent in a weakly acidic medium with pH 5.6 is observed at a wavelength of 340 nm, and its single-ligand complex with molybdenum—at 409 nm
Summary
Polyfunctional azopyrocatechols are typical and valuable reagents for the spectrophotometric determination of metal ions [1] [2]. Their analytical capabilities can be significantly expanded if complexation reactions with metal ions are carried out in the presence of a Superficially Active Substance (SAS) [3] [4]. The aim of this work is to study the complexation of Mo (VI) with stillbazo in the presence of a cationic surfactant (CPCl) and use the data obtained for the development of a selective and sensitive spectrophotometric method for the determination of molybdenum (VI)
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