可见分光光度法测定乳状液过氧化值的研究

本实验采用分光光度法对国内现有的乳状液中氢过氧化物含量的测定方法进行改进。论文对方法中的测定条件、精确度及影响因素进行评价和分析。结果显示,Fe3+浓度在0～4mg/L范围内,Fe3+-硫氰酸盐络合物在510nm处的吸光值与浓度关系符合朗伯-比耳定律,该方法的相对标准偏差RSD=0.60%,加标回收率为98.2%～101.2%,最低检出量为1.701meq/kg。结果表明,采用本方法测定乳状液中油脂的过氧化物值具有试剂用量少、灵敏度和精确度高的优点,适用于乳状体系中氢过氧化物含量的测定。

Determination of POV in Oil-in-water Emulsions by Visual-spectrophotometry

A visual-spectrophotometry method for peroxide value (POV) of oil-in-water emulsions was studied in this paper. The determination conditions, precision, accuracy and influencing factors of the method were discussed in detail. The results showed that, when the concentration of Fe3+ is in the range of 0～4mg/L, the relationship between absorbance at 510nm and concentration of Fe3+ -thiocyanate complex compound accords with the Lambert & Bill’s law. The relative standard deviation is 0.60%. The rates of recovery are 98.2%～101.2%. The limited detection POV is 1.701meq/kg. The results indicated that this method can provide high precision and accuracy and low cost of reagents. This method is suitable for hydroperoxides analysis ofo il-in-watere mulsions.