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Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Development of high-purity pyrethrins certified reference material.

Hui-Yeon Lee1, Youngjik Park1, Kyungjin Lee1

  • 1Department of Pharmacy and Research Institute of Pharmaceutical Science and Technology (RIPST), Ajou University, Suwon 16499, Republic of Korea.

Food Chemistry
|November 21, 2025
PubMed
Summary
This summary is machine-generated.

A stable, high-purity pyrethrins certified reference material (CRM) was developed for pesticide analysis. This new CRM ensures reliable pyrethrin residue quantification and enhances analytical quality.

Keywords:
Argon-purged packageHomogeneity assessmentISO 33405Mass balancePesticide residue analysisStability assessmentUncertainty estimation

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Area of Science:

  • Analytical Chemistry
  • Environmental Science

Background:

  • Certified Reference Materials (CRMs) are crucial for accurate pesticide residue analysis.
  • Existing CRMs may lack the required purity or stability for comprehensive pyrethrin analysis.

Purpose of the Study:

  • To develop a stable and high-purity pyrethrins CRM.
  • To validate the CRM's suitability for reliable pesticide residue analysis.

Main Methods:

  • Chromatographic purification of pyrethrum extract.
  • Argon-purged packaging for enhanced stability.
  • Mass balance and external calibration for purity determination.
  • ISO-guided approach for CRM property evaluation.

Main Results:

  • Development of a pyrethrins CRM with high purity (total pyrethrins: 98.6 ± 0.9%).
  • Quantification of six individual pyrethrin compounds with certified purity values and uncertainties.
  • Demonstrated excellent homogeneity, stability, and metrological traceability of the candidate CRM.

Conclusions:

  • Successfully developed a stable, high-purity pyrethrins CRM.
  • The CRM significantly improves the reliability and quality of pyrethrin residue analysis.
  • This CRM is a valuable tool for regulatory compliance and environmental monitoring.