Under the optimum experimental conditions （（i.e.,）pH=1.6, c （KI）=10.6 mmol/L, c （H 2O 2）=5.4 mmol/L, c （C 6H 8O 6）=1.30 mmol/L） derived from simplex operations, trace molybdenum（VI） was determined through the agency of its catalytic effect on the reaction of H 2O 2 with I- in acid medium. The detection limit and linear calibration range of molybdenum were obtained as 0.5×10-6 mol/L and 0.5×10-6～120×10-6 mol/L respectively. This method was applied to the examination of the industrial waste water, and the recovery ratios were found to be in the range of 101% and 107%.
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