methods to analyze iodine in salt moldova april 2004 arnold timmer unicef regional office l.
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Methods to Analyze Iodine in Salt Moldova – April 2004 - Arnold Timmer UNICEF Regional Office. Methods . Titration Rapid Test kit Iodine Checker Machine . Titration. Quantitative Accurate and reliable Inexpensive

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methods to analyze iodine in salt moldova april 2004 arnold timmer unicef regional office
Methods to Analyze Iodine in SaltMoldova – April 2004 -Arnold TimmerUNICEF Regional Office
methods
Methods
  • Titration
  • Rapid Test kit
  • Iodine Checker Machine
titration
Titration
  • Quantitative
  • Accurate and reliable
  • Inexpensive
  • Suitable for fixed labs and trained staff in salt companies, external quality control, nutrition/public health center
rapid test kit
Rapid Test Kit
  • Qualitative: yes or no
  • Inexpensive
  • Easy to perform by untrained staff
  • Suitable for small salt producers, salt importers, children at school, household surveys
  • Not good for quality assurance
iodine checker
Iodine Checker
  • Measuring iodine in salt quickly and precisely during it production and distribution can be difficult
  • Titration methods accurate but are not easily applied in salt plants
  • The Salt Research Institute of the China National Salt Industry Corporation developed the WYD Iodine Checker
iodine checker machine7
Iodine Checker Machine
  • Measurement range 10-80 mg/kg
  • Method:
    • Fixed amount of iodized salt (1 g) is dissolved in distilled water, then H2SO4 (sulfuric acid) and KI (potassium iodide) are added.
    • iodine reacts with starch to produce a blue color
  • Works on 220 V or batteries
  • Cost 300 US$
slide9
Independent testing:
    • Chemical Engineering, Univ. Toronto, Canada
      • results agreed closely with titration
      • acceptable accuracy, precision, and reproducibility
    • China National IDD Reference Laboratory
      • assessed in 100 labs in salt plants
      • precision slightly lower than that of titration
      • batch variance coefficient 5%
      • practical to use
      • user-friendly