食品科学 ›› 2005, Vol. 26 ›› Issue (9): 420-422.

• 分析检测 • 上一篇    下一篇

压力自控微波密闭消解——铅试剂光度法测定食品中铅

 司文会, 李克俭   

  1. 苏州农业职业技术学院
  • 出版日期:2005-09-15 发布日期:2011-09-20

Determination of Pb in Foods by Dithizone Spectrophotometric and Self-controling Pressure for Microwave Digestion

 SI  Wen-Hui, LI  Ke-Jian   

  1. Suzhou Agriculture College
  • Online:2005-09-15 Published:2011-09-20

摘要: 利用压力自控微波密闭消解技术,分析样与浓硝酸、高氯酸和氢氟酸充分混合,在固定微波输出功率650W情况下,采用0.5MPa2min、1.0MPa2min、1.5MPa1min阶梯升压方式快速分解,减少了分析液引入污染的机会,简便、快速、准确;采用正交试验,优选出最佳消解体系,方法的检出限0.20μg/cm3,RSD1.90%,CV98.70%~100.70%,用于食品中铅的测定,结果十分满意。

关键词: 压力自控, 微波消解, 铅试剂光度法, 食品,

Abstract: Analyzing sample blending adequately strong nitric acid, high chlorin acid and hydrofluoric acid by self-controlling technology for cleaning microwave digestion under the pressure of optical fiber. Rapidly decomposing by adopting increasing ladder pressure in 0.5MPa 2min, 1.0MPa 2min, 1.5MPa 1min under the fixed deferent power 650W of microware with a simple and convenient, quick, accurate result also reducing analytic liquid polluting. Correctitude across examination was adopted to choose the best digestion system. The detection limit was 0.20μg/cm3, RSD 1.90%, CV 98.70%~100.70%.The method has been used for the determination of Pb in foods with a satisfactory result.

Key words: self-controling pressure, microwave digestion, dithizone spectrophotometric, foods, Pb