Sequential Injection-kinetic Spectrophotometric Method for Determination of Formaldehyde

A kinetic spectrophotometric method combined with sequential injection analysis was proposed for the determination of trace formaldehyde.It was based on the catalytic effect of formaldehyde on the oxidation of ethyl orange by potassium bromate in acid medium and at room temperature.The linear range of the detection was 0.01～15 mg/L and the detection limit for formaldehyde was 0.004 mg/L.The relative standard deviation was 0.38 % via nine repeated determination of 10 mg/L formaldehyde.The method was applied to determine formaldehyde of environmental water with satisfactory result.