As an exception, α + β endosulfan and fenitrothion showed a negative trend that was significant, likely as a consequence of limited stability at −20 °C.
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Development of a new cucumber reference material for pesticide residue analysis: feasibility study for material processing, homogeneity and stability assessment.
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The sentences
In the case of azoxystrobin at −20 °C, a positive trend was observed, although the difference between the highest and lowest values remained within the uncertainty of the analytical procedure.