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当前位置: 首页 > 文章 > 分光光度法对面粉中微量溴酸钾的测定 湖北农业科学 2014 (9) 2143-2145
Position: Home > Articles > Determination of the Potassium Bromate in Wheat Flour by UV Spectrophotometry Hubei Agricultural Sciences 2014 (9) 2143-2145

分光光度法对面粉中微量溴酸钾的测定

作  者：
杨运琼;徐丽
单  位：
淮海工学院化工学院
关键词：
面粉;溴酸钾;结晶紫;离子缔合物;分光光度法
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。
译  名：
Determination of the Potassium Bromate in Wheat Flour by UV Spectrophotometry
作  者：
YANG Yun-qiong;XU Li;School of Chemical Engineering,Huaihai Institute of Technology;
关键词：
wheat flour;;potassium bromate;;crystal violet;;ion-association complex;;spectrophotometric method
摘  要：
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.

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