分光光度法对面粉中微量溴酸钾的测定  被引量:5

Determination of the Potassium Bromate in Wheat Flour by UV Spectrophotometry

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作  者:杨运琼[1] 徐丽[1] 

机构地区:[1]淮海工学院化工学院,江苏连云港222005

出  处:《湖北农业科学》2014年第9期2143-2145,共3页Hubei Agricultural Sciences

基  金:淮海工学院校内资助项目(Z2011015)

摘  要:在硫酸介质中,BrO3-氧化I-形成I3-络阴离子,I3-络阴离子可进一步与结晶紫阳离子形成离子缔合物,在聚乙烯醇存在下,缔合物呈清亮的浅棕红色溶液,以试剂空白为参比,最大吸收波长为542nm,吸光度与BrO3-浓度呈线性关系,线性范围为0.5-3.5μg/10mL,表观摩尔吸光系数为1.02×105L/(mol·cm),检出限为0.016μg/mL,样品回收率为95.2%-101.4%,RSD为2.69%。将该方法用于面粉中微量溴酸钾测定,结果令人满意。A highly sensitive spectrophotometry method was used to determine trace amounts of KBrO3based on the oxidation of I-to I3-by BrO3-and the further reaction of I3-with crystal violet to form the ion-association complex in sulfuric acid medium. In the PVA, the complex was transparent brownish-red. The maximum absorption wavelength was 542 nm against reagent blank. It was found that the absolute value of the maximum absorption wavelength was proportional to the BrO3-concentration. Beer's law was obeyed in the rang of 0.5~3.5 μg / 10 mL. The apparent molar absorption coefficient was 1.02×105L·mol^-1·cm^-1, with detection limit of 0.016 μg / mL. The spiked recoveries were 95.2%~101.4%,with the RSD of 2.69%. The method was used to determine trace bromate in wheat flour with satisfactory results.

关 键 词:面粉 溴酸钾 结晶紫 离子缔合物 分光光度法 

分 类 号:O657.32[理学—分析化学]

 

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