食品科学 ›› 2010, Vol. 31 ›› Issue (22): 417-420.doi: 10.7506/spkx1002-6630-201022093

• 分析检测 • 上一篇    下一篇

催化氧化荧光法测定防腐剂苯甲酸

周福林,宋少飞,弓巧娟,张稳婵,周 蓓   

  1. 运城学院应用化学系
  • 收稿日期:2010-02-08 出版日期:2010-11-25 发布日期:2010-12-29
  • 通讯作者: 周福林 E-mail:ssfzfl@163.com
  • 基金资助:

    运城学院2009 年度院级基础研究项目(JC-2009005);运城学院基金项目(20060228);
    山西省教育厅高等教育研究基金项目(200713033)

Determination of Preservative Benzoic Acid by Catalytic Oxidation Fluorometry

ZHOU Fu-lin,SONG Shao-fei,GONG Qiao-juan,ZHANG Wen-chan,ZHOU Bei   

  1. Department of Applied Chemistry, Yuncheng University, Yuncheng 044000, China
  • Received:2010-02-08 Online:2010-11-25 Published:2010-12-29
  • Contact: ZHOU Fu-lin E-mail:ssfzfl@163.com

摘要:

在pH8 的NaH2PO4-Na2HPO4 缓冲溶液中,Co2+ 催化KBrO3 氧化苯甲酸产生强荧光,建立催化氧化荧光法间接测定苯甲酸的新方法。在最优化条件下,苯甲酸质量浓度在5 × 10-7~3 × 10-5g/mL 范围内与荧光强度呈良好的线性关系,方法的检出限为2 × 10-8g/mL。对质量浓度为1 × 10-6g/mL 的苯甲酸标准溶液进行11 次平行测定,得相对标准偏差(RSD)为1.9%。该法应用于食醋及酱油中苯甲酸的测定,回收率为95.7%~101.6%,结果令人满意。

关键词: 催化氧化, 荧光法, 苯甲酸, 防腐剂

Abstract:

Based on the catalytic effect of cobalt (II) on the oxidation of benzoic acid by potassium bromate in NaH2PO4-Na2HPO4 buffer solution at the condition of pH 8, a new catalytic oxidation fluorometry method was proposed for the indirect determination of benzoic acid. Under optimal determination conditions, an excellent linear relationship between benzoic acid concentration within a range of 5×10-7-3×10-5 g/mL and fluorescence intensity was observed. The detection limit of this established method was 2×10-8 g/mL. The reproducibility experiments revealed the relative standard deviation (RSD) of 1.9% for benzoic acid solution at the concentration of 1×10-6 g/mL. This established method has been applied for the detection of benzoic acid in vinegar and sauce. The recovery rates were in the range of 95.7%-101.6% with satisfactory results.

Key words: catalysis oxidation, fluorimetry, benzoic acid, preservative

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