电导滴定法测定食品中二氧化硫残留量

Determination of Sulfur Dioxide Residue in Food by Conductance Titration

建立了一种用电导滴定的方法测定食品中二氧化硫残留量的新方法,该方法是使用过氧化氢吸收从含硫食品中蒸馏出的二氧化硫,使其完全转化为硫酸,逐滴加入氢氧化钠溶液于吸收液中,记录吸收液电导率数据,以此检测食品中二氧化硫残留量。测试结果表明,蒸馏后电导滴定优于蒸馏后间接碘量法,且该测定方法既简单易行,快捷灵敏,同时经济实惠又环保。

A new method for determination of residues of sulfur dioxide was developed. With this method, hydrogen peroxide was used to absorb the sulfur dioxide distillated from food samples, giving sulfuric acid. And the conductivity data of the absorption solution added with sodium hydroxide solution was determined. The results showed that the conductance titration after distillation was better than indirect iodometric method after distillation, which was simple, fast, sensitive, economical and environmentally friendly.