摘要
在稀硫酸介质中,阳离子表面活性剂苄基三乙基氯化铵增敏剂存在下,痕量碘离子对亚硝酸根催化溴酸钾氧化亚甲基蓝的褪色反应有显著阻抑作用。据此建立了表面活性剂增敏阻抑动力学光度法分析测定痕量碘的新方法。方法的线性范围为0～480g/L,检出限为3.7×10-7g/L。该法快速、灵敏、操作简单,用于粗盐中痕量碘的测定,结果满意。
An inhibitory kinetic spectrophotometric method was proposed for the determination of trace iodine. The method is based on the inhibition effect of iodine on the nitrite-catalyzed oxidation of menthylene blue by potassium bromate in dilute sulphuric acid medium. The linear range of the determination is 0 to 480 g/L, and the detection limit is 3.7 ×10^-7g/L. This method is simple, rapid and highly sensitive. It has been used for determination of trace iodine in salt with satisfactory results.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2008年第12期549-551,共3页
Food Science
关键词
碘
动力学光度法
阻抑反应
亚甲蓝
溴酸钾苄基三乙基氯化铵
iodine
kinetic spectrophotometry
inhibition reaction
methylene blue
potassium bromate benzyl triethyl ammonium chloride
