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Related Concept Videos

Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

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In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
In the Volhard method, a standard excess of AgNO3 is first added to the...
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Data Validation01:15

Data Validation

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Method validation is a crucial process in analytical chemistry designed to confirm that a given method consistently produces reliable and high-quality results. This process is essential when a method is applied to different sample matrices or when procedural modifications are made, ensuring that the results meet acceptable standards across various applications.
Key parameters for method validation include:
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Related Experiment Video

Updated: Jul 6, 2025

Measuring Nitrite and Nitrate, Metabolites in the Nitric Oxide Pathway, in Biological Materials using the Chemiluminescence Method
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[Validation of Method for Nitrite Determination in Foods].

Kyoko Sato1, Shoko Terami1, Takahiro Sasaki2

  • 1National Institute of Health Sciences.

Shokuhin Eiseigaku Zasshi. Journal of the Food Hygienic Society of Japan
|January 3, 2024
PubMed
Summary

A new analytical method for determining nitrite in food was validated. This improved method accurately and reproducibly measures nitrite levels in various food products, offering a reliable alternative for food safety testing.

Keywords:
cod roecolor fixativefish sausagefood additivehumnitrite

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Area of Science:

  • Food chemistry
  • Analytical chemistry
  • Food safety analysis

Context:

  • Traditional nitrite analysis involves alkaline extraction, deproteinization, and colorimetric determination.
  • Sample turbidity after deproteinization can hinder filtration and accurate analysis.
  • An improved analytical method has been developed to address these limitations.

Purpose:

  • To validate an improved analytical method for determining nitrite in food samples.
  • To assess the method's trueness, repeatability, and intralaboratory reproducibility.
  • To conduct an interlaboratory study to confirm the method's robustness.

Summary:

  • The improved method was validated using cod roe, fish sausage, and ham, with added sodium nitrite. Target values for trueness (70-120%) and reproducibility (<15%) were met.
  • Trueness ranged from 88-92%, repeatability from 2.0-3.0%, and intralaboratory reproducibility from 3.2-4.3%.
  • An interlaboratory study involving eight institutes confirmed the method's reliability, with trueness between 82-95% and reproducibility metrics well within acceptable ranges.

Impact:

  • The improved analytical method provides a more robust and reliable approach for nitrite determination in diverse food matrices.
  • This method can enhance food safety protocols by enabling accurate quantification of nitrite preservatives.
  • Successful interlaboratory validation suggests widespread applicability and adoption in food analysis laboratories.