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Highly polar pesticides in potatoes and pears (P1501-MRT)

In January/February 2015 PROOF-ACS organised and performed a method ring test related to highly polar pesticides.

  • Dispatch of samples:
    January 19, 2015
  • Deadline for reporting results:
    February 4, 2015

PROOF method ring tests focus on analytically challenging parameters and/or matrices. This method ring test was designed to fit to highly polar pesticides which can by analysed by the QuPPe method published by CVUA Stuttgart. The participating laboratories were asked to report the analytical results together with details related to the applied analytical method. The evaluation of the analytical results in combination with the analytical details of the applied methods helps to identify possible areas of improvement and to enhance the quality of the applied methods.

The analytical data are assessed with respect to

  • the comparability (z-score), and
  • the trueness (70 to 120% of the spiked level).

The details related to the applied analytical methods are summarised in the technical appendix (part 2 of the report).

A summary of the report is available here.

Two test materials (homogenates, 180 g) were offered:

  • pear spiked with
    chlorate, chlormequat, ethephon, mepiquat and phosphonic acid
  • potato spiked with
    cyromazin, diquat, maleic hydrazide, paraquat and phosphonic acid

It was up to the participants to order one or both test materials and to quantify the full set of analytes per test material or a selection of it.

Participation fee:
350 EUR basic price (general costs for organisation, evaluation, etc.)
300 EUR for each of the two test materials
The corresponding blank materials were available at a price of 70 EUR each.