{"id":19450,"date":"2020-08-17T09:02:00","date_gmt":"2020-08-17T07:02:00","guid":{"rendered":"http:\/\/www.phytocontrol.com\/?p=19450"},"modified":"2020-09-15T09:13:11","modified_gmt":"2020-09-15T07:13:11","slug":"measurement-uncertainty-and-compliance-in-pesticide-analysis","status":"publish","type":"post","link":"https:\/\/www.phytocontrol.com\/en\/regulatory-watch\/measurement-uncertainty-and-compliance-in-pesticide-analysis\/","title":{"rendered":"Measurement Uncertainty and Compliance in Pesticide Analysis"},"content":{"rendered":"\n
\"Measurement\"Measurement<\/div><\/div>\n\n\n\n\n

<\/p>\n\n\n\n

Regulatory and Technical Reminder :<\/strong><\/p>\n\n\n\n

Regulation N\u00b0396\/2005 sets the MRLs (Maximum Residue Limits)\nfor each pesticide-crop pair. If the products contain active substances whose\nlevels exceed the MRLs, they cannot be marketed.<\/p>\n\n\n\n

For each analytical result, a measurement uncertainty is\ndetermined.<\/p>\n\n\n\n

The measurement uncertainty is a parameter associated with\nthe result that characterizes the dispersion of the values that could\nreasonably be attributed to the measurand.<\/p>\n\n\n\n

In other words, uncertainty is a confidence interval built\naround the result in which the “true” value has some probability of\nbeing contained. <\/p>\n\n\n\n

How do authorities take measurement uncertainty into account in conformity assessment?<\/strong><\/p>\n\n\n\n

The European guide SANTE\/12682\/2019<\/a> “Procedures for analytical quality control and method validation for the analysis of pesticide residues in food and feed” is a document for official control laboratories throughout the European Union. <\/p>\n\n\n\n

The guide specifies that the interpretation of results\nshould be carried out using uncertainty in order to verify the compliance of\nthe sample. <\/p>\n\n\n\n

In order to cover inter-laboratory variability between\ndifferent laboratories, it is recommended that national regulatory authorities\nuse a default “increased” measurement uncertainty of 50%.<\/p>\n\n\n\n

To use this common uncertainty, each laboratory should\ndemonstrate that its own analytical method achieves a measurement uncertainty\nof less than 50%.<\/p>\n\n\n\n

In E15, the guide states that the result should be reported\nas follows:
\nResult = x \u00b1 U (units), where x is the measured value and U is the measurement\nuncertainty.
\nIn the context of official food controls by regulatory authorities, compliance\nwith the MRL should be verified as follows :
\nThe sample is considered non-compliant if x-U> MRL.
\nAs an example :
\nIf MRL = 1mg\/kg
\nResult x = 2.2mg\/kg and U = 50%, then (x-U) = (2.2- 1.1) = 1.1 > MRL or\nNON-conforming sample.
\nIf MRL = 0.5mg\/kg
\nResult x = 0.8mg\/kg and U = 50% then (x-U) = (0.8 – 0.4) = 0.4 < MRL i.e.\nCONFORM Sample <\/p>\n\n\n\n

Therefore, “downward” uncertainty should be taken\ninto account when concluding on the compliance of a sample.<\/p>\n\n\n\n

Need technical, regulatory and pricing information? Our customer service is available from 8am to 8pm Monday to Friday at +44(0)2037430973<\/a> or service-clients@phytocontrol.com. <\/p>\n\n\n\n

And to not miss anything of the Phytocontrol news, join us on our LinkedIn <\/a>and Facebook <\/a>page!<\/p>\n","protected":false},"excerpt":{"rendered":"

Regulatory and Technical Reminder : Regulation N\u00b0396\/2005 sets the MRLs (Maximum Residue Limits) for each pesticide-crop pair. If the products contain active substances whose levels exceed [\u2026]<\/span><\/p>\n","protected":false},"author":8,"featured_media":19455,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[181],"tags":[],"yst_prominent_words":[2976,281,2829,3107,2874,3105,3098,2448,3102,1844,3101,3104,3103,3099,3106,2975,2971,3100,2974,2977],"class_list":["post-19450","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-regulatory-watch"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.phytocontrol.com\/en\/wp-json\/wp\/v2\/posts\/19450","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.phytocontrol.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.phytocontrol.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.phytocontrol.com\/en\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/www.phytocontrol.com\/en\/wp-json\/wp\/v2\/comments?post=19450"}],"version-history":[{"count":0,"href":"https:\/\/www.phytocontrol.com\/en\/wp-json\/wp\/v2\/posts\/19450\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.phytocontrol.com\/en\/wp-json\/wp\/v2\/media\/19455"}],"wp:attachment":[{"href":"https:\/\/www.phytocontrol.com\/en\/wp-json\/wp\/v2\/media?parent=19450"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.phytocontrol.com\/en\/wp-json\/wp\/v2\/categories?post=19450"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.phytocontrol.com\/en\/wp-json\/wp\/v2\/tags?post=19450"},{"taxonomy":"yst_prominent_words","embeddable":true,"href":"https:\/\/www.phytocontrol.com\/en\/wp-json\/wp\/v2\/yst_prominent_words?post=19450"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}