摘要
基于在硫酸介质中甲醛对高碘酸钾氧化甲基红有较强的催化作用,建立了测定水发产品中痕量甲醛的新方法。研究了影响催化褪色反应速度的条件,在最优化条件下,甲醛浓度在2.25×10-4～1.35×10-2μg·mL-1范围内与吸光度呈良好的线性关系,方法的检出限为4×10-5μg·mL-1,对浓度为0.0041μg·mL-1的甲醛标准溶液进行11次平行测定,得出相对标准偏差(RSD)为0.1%。该法具有灵敏度高、选择性好等特点,用于水发产品中甲醛的测定,回收率为94%～103%。
Based on the catalytic effect of trace formaldehyde on the reaction between high potassium iodate and methyl red in sulfuric acid,a new catalytic spectmphotometric method for the determination of formaldehyde was established in this paper. The formaldehyde concentration within a range of 2.25×10^-4～1.35×10^-2 μg·mL^-1 has a good linear relation in the optimal con- ditions. The detection limit was 4×10^-5μg ·mL^-1 with a relative standard deviation （RSD） of 0.1% for 0.004 1 μg·mL^-1 formaldehyde solution （n=11） and a recoveries of 94%-103%. The results indicated that this method was sensitive and selective for detecting formaldehyde in hydro-products.
出处
《湖北农业科学》
北大核心
2009年第3期710-712,共3页
Hubei Agricultural Sciences
基金
运城学院基金项目(20060229)资助
关键词
催化光度法
甲醛
水发产品
catalytic spectrnphotometry
formaldehyde
hydro-products
