{"id":989491,"date":"2026-05-11T15:54:31","date_gmt":"2026-05-11T15:54:31","guid":{"rendered":"https:\/\/palegreen-hyena-800612.hostingersite.com\/new-proficiency-testing-round-pt-cr-vi\/"},"modified":"2026-05-24T21:45:34","modified_gmt":"2026-05-24T21:45:34","slug":"new-proficiency-testing-round-pt-cr-vi","status":"publish","type":"post","link":"https:\/\/oikoslab.pl\/en\/new-proficiency-testing-round-pt-cr-vi\/","title":{"rendered":"New Proficiency-Testing Round: PT-Cr(VI) on Filters"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"989491\" class=\"elementor elementor-989491\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2b7d8ee7 e-flex e-con-boxed e-con e-parent\" data-id=\"2b7d8ee7\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"vamtam-has-theme-widget-styles elementor-element elementor-element-41d9f13f elementor-widget elementor-widget-text-editor\" data-id=\"41d9f13f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>OIKOS is launching a new proficiency-testing programme in 2026: <strong>PT-Cr(VI)<\/strong> \u2014 an interlaboratory comparison covering the determination of hexavalent chromium compounds on collection filters. The round is offered as a supplement to our standard PT-010 schedule and is open to all interested laboratories, not only those who routinely participate in PT-010.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f8660c8 elementor-widget elementor-widget-heading\" data-id=\"f8660c8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Why a dedicated Cr(VI) round<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"vamtam-has-theme-widget-styles elementor-element elementor-element-b9e196c elementor-widget elementor-widget-text-editor\" data-id=\"b9e196c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Hexavalent chromium is one of the most strictly regulated workplace and environmental contaminants in Europe. It is classified as a CMR substance (carcinogenic, mutagenic, reprotoxic) under Regulation (EC) No 1272\/2008, the occupational exposure limits enforced in Poland are among the lowest in the EU, and recent revisions of the EU Carcinogens Directive have tightened airborne limits further still.<\/p><p>Reliable Cr(VI) measurement is technically demanding \u2014 sample stability, matrix interferences and method-specific recovery all affect the result. A dedicated round helps laboratories demonstrate their performance for accreditation audits and internal quality reviews.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ac18035 elementor-widget elementor-widget-heading\" data-id=\"ac18035\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Programme details<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"vamtam-has-theme-widget-styles elementor-element elementor-element-dea4afc elementor-widget elementor-widget-text-editor\" data-id=\"dea4afc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li><strong>Matrix:<\/strong> filters representative of typical workplace and stack-emission sampling<\/li><li><strong>Determinand:<\/strong> Cr(VI) compounds (reported as Cr)<\/li><li><strong>Round:<\/strong> 1<sup>st<\/sup> round of 2026; additional dates are listed in our online schedule<\/li><li><strong>Eligibility:<\/strong> any laboratory running Cr(VI) determinations \u2014 participation is independent of PT-010 enrolment<\/li><li><strong>Operating scope:<\/strong> the PT-Cr(VI) programme is offered outside our PT-010 PCA-accredited scope<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ff3eb46 elementor-widget elementor-widget-heading\" data-id=\"ff3eb46\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How to register<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"vamtam-has-theme-widget-styles elementor-element elementor-element-72fe364 elementor-widget elementor-widget-text-editor\" data-id=\"72fe364\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The programme outline (konspekt), registration form and full schedule are published in the Proficiency Testing area of our website. For specific questions about test items, deadlines or shipment logistics, contact us at <a href=\"mailto:sekretariat@oikoslab.pl\">sekretariat@oikoslab.pl<\/a>.<\/p><p>Each participant receives a complete evaluation report after the round closes, including z-score, E<sub>n<\/sub>-score and trend information against earlier OIKOS Cr(VI) data where available.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>As part of our 2026 PT schedule we are launching a new proficiency-testing programme covering hexavalent chromium (Cr-VI) on collection filters \u2014 open to all interested laboratories.<\/p>\n","protected":false},"author":1,"featured_media":989598,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seowing_meta_title":"New PT-Cr(VI) Proficiency Round on Filters | OIKOS","_seowing_meta_description":"OIKOS launches a 2026 proficiency-testing round, PT-Cr(VI), an interlaboratory comparison for hexavalent chromium on collection filters, open to all labs.","_seowing_focus_keyword":"PT-Cr(VI) proficiency testing","_seowing_canonical_url":"","_seowing_robots":"","_seowing_robots_noindex":false,"_seowing_robots_nofollow":false,"_seowing_seo_score":40,"footnotes":""},"categories":[30],"tags":[],"class_list":["post-989491","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-proficiency-testing"],"_links":{"self":[{"href":"https:\/\/oikoslab.pl\/en\/wp-json\/wp\/v2\/posts\/989491","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oikoslab.pl\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/oikoslab.pl\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/oikoslab.pl\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/oikoslab.pl\/en\/wp-json\/wp\/v2\/comments?post=989491"}],"version-history":[{"count":12,"href":"https:\/\/oikoslab.pl\/en\/wp-json\/wp\/v2\/posts\/989491\/revisions"}],"predecessor-version":[{"id":989601,"href":"https:\/\/oikoslab.pl\/en\/wp-json\/wp\/v2\/posts\/989491\/revisions\/989601"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oikoslab.pl\/en\/wp-json\/wp\/v2\/media\/989598"}],"wp:attachment":[{"href":"https:\/\/oikoslab.pl\/en\/wp-json\/wp\/v2\/media?parent=989491"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/oikoslab.pl\/en\/wp-json\/wp\/v2\/categories?post=989491"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/oikoslab.pl\/en\/wp-json\/wp\/v2\/tags?post=989491"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}