Abstract
Complex ions of molybdenum(VI) with 8-hydroxyquinoline (oxine) are shown to adsorb onto the hanging mercury drop electrode. This property forms the basis of a sensitive electrochemical technique by which dissolved molybdenum in seawater can be determined directly. The reduction current of adsorbed complex ions is measured by differential pulse adsorption voltametry, preceded by a period of 1 or 2 min of unstirred collection at an adsorption potential of -0.2 V. In the presence of 2 x 10/sup -3/ M oxine and at pH 2.5 the potential of the main reduction peak is located at -0.59 V. The peak current-molybdenum concentration relationship is linear up to 3 x 10/sup -7/ M; the detection limit is 4 nM. Greater sensitivity is obtained after stirred collection at pH 3.0 and with 10/sup -4/ M oxine, but the calibration curve is nonlinear. In these conditions the limit of detection lies at 10/sup -10/ M after 10 min stirred collection. 19 references, 8 figures.
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