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Pesticides in fruit tea - multi-method (P1404-RT)

Pesticides in fruit tea proficiency test

PROOF-ACS organised and performed a ring test on pesticides in September 2014. Eight laboratories across three European countries (Germany, Spain, the Netherlands) took part in the proficiency testing. All laboratories applied a multi-method approach to quantify pesticides in the fruit tea sample.

The test material consisted of fruit tea
(50 g, powder) spiked with 14 pesticides, typically of fruit tea:
Carbendazim, chlorothalonil, cypermethrin, deltamethrin, fenpyroximate, imazalil, iprodione, MCPA, methidathion, myclobutanil, phosalone, propargite, thiabendazole, trifloxystrobin.

Neither the number of spiked pesticides nor the identity of the pesticides was announced to the participants in advance. All spiked pesticides are within the scope of a common pesticide multi-method.

Each participant received a report after the evaluation of the analytical results.
The report contains an assessment on:

  • the identification of the spiked pesticides,
  • the correct quantification with respect to the 
    trueness criterion (70-120 % recovery of the spiked level), and
  • the correct quantification with respect to the 
    comparability criterion (z-score ≤ |2|).

A summary of the report is available here.

The time schedule was: 

  • Dispatch of samples:
    September 22, 2014
  • Sample arrival (in the laboratory):
    September 23/24, 2014
  • Deadline for reporting results:
    October 8, 2014

The participation fee was 650 EUR, blank material was available at a price of 70 EUR.