Catalytic determination of molybdenum with improved sensitivity by means of the hydrogen peroxide/iodide/ascorbic acid landolt reaction

Modified catalytic procedures are described for the determination of 0–0.1 and 0–1 mg l^?1 molybdenum in solutions. Reaction times of the hydrogen peroxide/iodide/ascorbic acid Landolt reaction are evaluated from conductometric or potentiometric traces. Calibration graphs are based on the ratio of the reaction times for the blank and the sample, t(0)/t(c), plotted against the concentration of molybdenum. The shapes of the conductometric and potentiometric traces are explained.