Abstract
Abstract A spectrophotometric stopped-flow injection method for the determination of formaldehyde based on its catalytic property to oxidize p-phenylenediamine by hydrogen peroxide is described. The calibration graph is linear over the range 3–300 mg 1−1 of formaldehyde. A sampling-rate of 35 samples h−1 was achieved. The effect of several organic and inorganic species was studied. The method was applied to the determination of formaldehyde in air in work environments and its accuracy was confirmed by comparing the results with those obtained using the standard acetylacetone method. The presence of sulphite decreases the catalytic effect of formaldehyde and this is the base for a new stopped-flow injection method for determination of sulphite. The proposed method for SO3 2- shows a working range of 5–60 mg 1−1 with a sampling-rate of 25 samples h−1. The usefulness of the method was tested in the determination of sulphite in white wines.
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