ENHANCED SENSITIVITY FOR THE DIFFERENTIAL-PULSE POLAROGRAPHIC-DETERMINATION OF MO(VI) BASED ON ADSORPTION CATALYTIC CURRENT

A differential pulse polarographic (DPP) method based on the adsorptio n catalytic current in a medium containing chlorate and 8-hydroxyquino line (oxine) is suggested for the determination of molybdenum(VI). Exp erimental conditions such as pH and the composition of supporting elec trolyte have been optimized to get a linear calibration graph at trace levels of Mo(VI). The sensitivity for molybdenum can be considerably enhanced by this method. The influence of possible interferences on th e catalytic current has been investigated. The sensitivity of the meth od is compared with those obtained for other DPP methods for molybdenu m. A detection limit of 1.0 x 10(-8) mol/L has been found.