Volume No. 7 Issue No.: 4A Page No.: 1606-1609 April-June 2013

 

SPECTROPHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF Mo(VI) USING 2-HYDROXY-4-CHLORO- 5-METHYL ACETOPHENONE OXIME (HCMAOX) : AN ANALYTICAL REAGENT

 

Bharadwaj Punita S.

Department of Chemistry, Shree J. P. Arts and Science College, Bharuch, Gujarat (INDIA)

 

Received on : December 05, 2012

 

ABSTRACT

 

Molybdenum finds extensive applications in different fields. It is also an essential trace elements in animal physiology. In view of crucial role of molybdenum in different fields, it is necessary to develop sensitive analytical procedure for its determination in trace amounts. Out of variety of analytical methods, spectrophotometric method for micro determination of Mo(VI) by complexing with HCMAOX is simple, rapid, selective and accurate. The optimum condition for the determination of Mo(VI) were established using HCMAOX. Yellow colored water soluble dioxomolybdenyl complex with HCMAOX gives maximum absorption at 410nm and at pH 3.0. The effects of pH, time, addition of reagent and diverse ions have also been studied. The composition of complex was found to be 1:1 (metal:ligand) complex by Jobís method of continuous variation, mole ratio and slope ratio method. The Beerís law was applicable upto 61.44 ppm. The molar absorption coefficient, Sandellís sensitivity and stability constant of the complex was found to be 1.9765◊102 lit/mole/cm, 0.039628 µg/ml/cm2 and 1.7593◊103 respectively. The IR spectral study shows the development of MoO2 +2 in bonding which clearly indicates that chelation takes place through the oxygen of -OH group and nitrogen of =NOH group in dioxomolybdenyl complex. The magnetic study of this complex claims the octahedral diamagnetic character. The method was successfully applied for the determination of synthetic mixtures and alloys containing Mo(VI).

 

Keywords : HCMAOX, Molar absorptivity, Sandellís sensitivity, Stability constant, Molybdenum

 

 

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