Under the optimum experimental conditions ( i. e. ,pH = 1.6, CKI = 10. 6 mmol/L, CH2O2 = 5.4 mmol/L, CC6H8O6 = 1.30mmol/L) derived from simplex operations, trace molybdenum(VI) was determined through the agency of its catalytic effect on the reaction of H2O2 with I- in acid medium. The detection limit and linear calibration range of molybdenum were obtained as 0.5 × 10-6mol/L and 0.5 × 10- 6～ 120 × 10-6 mol/L respectively. This method was appli.ed 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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