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食品中锰的分析法主要有比色法、原子吸收法,比色法准确度较差,原子吸收法所用的仪器价格昂贵,不能普遍推广。催化动力学分析法弥补了二者的缺点,具有经济、简便、灵敏度高、便于在基层推广应用以及检出限低(大多可达到ng级或ug—ng间)等特点,近几年来受到较普遍的重视。本文在前人工作的基础上,采用高碘酸钾氧化次甲基兰为指示反应,用固定时间法,以次甲基兰褪色来指示反应速度。
Manganese in food analysis methods are colorimetric, atomic absorption, colorimetric accuracy is poor, the instruments used in atomic absorption method is expensive, can not be generalized. Catalytic kinetic analysis to make up for the shortcomings of both, with economic, simple, high sensitivity, easy to promote the use of the grass-roots level and the detection limit is low (mostly up to ng level or ug-ng room) and other characteristics in recent years by more Universal attention. Based on the previous work, this paper uses potassium periodate oxidation methylaniline as the indicated reaction, with a fixed time method, to methyl blue fading to indicate the reaction rate.