Spectrophotometric Determination of Trace amounts of Molybdenum(VI) Using 4-Hydroxybenzaldehydethiosemicarbazone

The reagent 4-hydroxybenzaldehyde thiosemicarbazone (4-HBTS) has been used for the determination of Mo(VI) by spectrophotometric method. The reagent 4-HBTS gives green colour with Mo(VI) solution of weak acidic medium and the maximum absorbance was observed at 365nm, in acidic buffer p H 6.0. The molar absorptivity and Sandell’s sensitivity of Mo(VI)4-HBTS complex are 1.25 x 10 L mol cm and 0.00109 μg/cm 2 respectively. The stability constant of 1:1 Mo(VI)-4-HBTS complex is 2.76x10 . The effect of various diverse ions is also studied. The method was successfully applied for the determination of molybdenum in alloys containing molybdenum. The influence of interferences on the proposed method was studied and presented. The method was successfully applied for the determination of molybdenum in different alloy samples. A detailed report on comparison of spectrophotometric methods for the determination of Mo (VI) using various organic reagents also summarized.