顺序注射催化动力学光度法测定织物和室内空气中痕量甲醛

Catalytic kinetic spectrophotometric determination of trace formaldehyde by sequential injection analysis

在磷酸介质中 ,甲醛可以催化溴酸钾氧化 花青的反应使其退色 ,据此建立了顺序注射催化动力学光度法测定织物和室内空气中痕量甲醛的新方法。方法的线性范围 0 .5～ 7.0 μg mL ,检出限 0 .1 μg mL。用于树脂整理特殊织物和室内空气中痕量甲醛的测定 ,回收率在 97.0 %～ 1 0 5 .0 %之间。

In this paper, a catalytic 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 gallocyanin by potassium bromate in phosphoric acid medium. The detection limit for formaldehyde was 0.1 μg/mL. The detection recovery was from 97.0% to 105.0%. The linear range of the determination was 0.5～7.0 μg/mL. The method was used to determine trace formaldehyde released from resin finishing special fabric and air in room with satisfactory results.