食品科学 ›› 2007, Vol. 28 ›› Issue (8): 395-398.

• 分析检测 • 上一篇    下一篇

毛细滴管数滴微型滴定法现场快速测定食盐中的碘酸钾

 蔡成翔, 兰翠玲   

  1. 广西百色学院化学与生命科学系; 广西百色学院化学与生命科学系 广西百色533000; 广西百色533000;
  • 出版日期:2007-08-15 发布日期:2011-10-24

Drops Counting of Capillary Burette Micro Titration for Fast Determination of Potassium Iodate in Edible Salt

 CAI  Cheng-Xiang, LAN  Cui-Ling   

  1. Department of Chemistry and Life Sciences, Baise University, Baise 533000, China
  • Online:2007-08-15 Published:2011-10-24

摘要: 毛细滴管数滴微型滴定法以价格不足0.3元/支的聚乙烯塑料滴管为量器进行滴定分析,不仅仪器结构简单、小巧、价廉、携带方便,而且试剂用量少,测定简便、快速、准确。用该法测定食盐中的碘酸钾,当毛细滴管规格为0.01~0.02ml/滴,滴定剂用量控制在60~90滴时,相对扩展不确定度Urel(C)约为1.3%,加标回收率=98.4%~101.5%,RSD=0.77%~1.6%,符合GB5009.42-2003的规定。采用数滴法进行现场快速测定,有利于碘盐生产及流通渠道中日常的质量和卫生监督工作的正常开展,值得推广应用。

关键词: 微型滴定, 毛细滴管, 食盐, 碘酸钾, 快速测定

Abstract: Drops counting of capillary burette micro titration with polyethylene burette to carry on titration analysis, the apparatus is simple, small, cheap, easy to carry, and less reagent consumed, while the determination is fast and correct. To determine potassium iodate in edible salt, the specification of home-made capillary burette is 0.01~0.02 ml/drop, and the dosage of standardization solution is controlled in 60~90 drop, with relative expand uncertainty about 1.3%, reclaim rates 98.4%~101.5%, and RSD 0.77%~1.6%, in accordance with stipulation of GB5009.42-2003. The methods used to assay edible salt production and daily sanitation surveillance work, can report rapidly the analysis results, worthy popularization.

Key words: micro titration, capillary burette, edible salt, potassium iodate, determine fleetly