{"id":55766,"date":"2019-11-20T00:00:00","date_gmt":"2019-11-19T22:00:00","guid":{"rendered":"https:\/\/unm.fr\/non-classifiee\/nf-iso-1656\/"},"modified":"2023-02-13T15:05:04","modified_gmt":"2023-02-13T14:05:04","slug":"nf-iso-1656","status":"publish","type":"post","link":"https:\/\/unm.fr\/en\/focus-norme\/nf-iso-1656\/","title":{"rendered":"NF ISO 1656 Dosage de l\u2019azote dans le caoutchouc et latex"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"55766\" class=\"elementor elementor-55766\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-57ca8c6e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"57ca8c6e\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-1691f2a9\" data-id=\"1691f2a9\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4218cb32 elementor-widget elementor-widget-text-editor\" data-id=\"4218cb32\" 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 style=\"text-align: justify;\">Pour r\u00e9pondre \u00e0 la politique de l\u2019ISO\/TC 45 &#8220;Elastom\u00e8res et produits \u00e0 base d\u2019\u00e9lastom\u00e8res&#8221; relative au remplacement des substances pr\u00e9occupantes dans les m\u00e9thodes d\u2019essais chimiques, un nouveau catalyseur a \u00e9t\u00e9 d\u00e9fini.<\/p><p style=\"text-align: justify;\">La nouvelle \u00e9dition de la norme NF ISO 1656 d\u00e9finit deux m\u00e9thodes, variantes du proc\u00e9d\u00e9 Kjeldahl, de d\u00e9termination de l&#8217;azote dans le caoutchouc naturel. Les m\u00e9thodes sont faciles \u00e0 mettre en \u0153uvre, s\u00fbreset respectueuses de l&#8217;environnement. Dans la pr\u00e9c\u00e9dente \u00e9dition, la m\u00e9thode pr\u00e9sentait l&#8217;avantage d&#8217;\u00eatre simple et pr\u00e9cise et faisait appel \u00e0 un \u00e9quipement ordinaire \u00e0 un faible co\u00fbt d&#8217;analyse. Cependant, elle utilisait uniquement un m\u00e9lange catalyseur \u00e0 base de s\u00e9l\u00e9nium, \u00e9l\u00e9ment nocif pour l&#8217;environnement et pour la sant\u00e9.<\/p><p style=\"text-align: justify;\">Des \u00e9tudes ont \u00e9t\u00e9 men\u00e9es pour trouver le catalyseur le plus appropri\u00e9pour remplacer le s\u00e9l\u00e9nium : le m\u00e9lange catalyseur \u00e0 base de dioxyde de titane TiO2\/CuSO4\/K2SO4 a \u00e9t\u00e9 retenu. Des essais interlaboratoires ont \u00e9t\u00e9 n\u00e9cessaires pour obtenir des donn\u00e9es de fid\u00e9lit\u00e9 confirmant la fiabilit\u00e9 de la m\u00e9thode ainsi que sa bonne r\u00e9p\u00e9tabilit\u00e9.<\/p><p style=\"text-align: justify;\">Autre avantage de ce m\u00e9lange catalyseur, et pas des moindres, son co\u00fbt total est environ 50 % inf\u00e9rieur \u00e0 celui d&#8217;un m\u00e9lange \u00e0 base de s\u00e9l\u00e9nium.<\/p><p style=\"text-align: justify;\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-58420\" src=\"https:\/\/unm.fr\/wp-content\/uploads\/2023\/02\/ISO-1656_PETITE.jpg\" alt=\"ISO 1656\" width=\"250\" height=\"265\" \/><\/p><p style=\"text-align: justify;\">\u00a0<\/p><p style=\"text-align: justify;\">\u00a0<\/p><p>Pour acheter la norme : <a href=\"https:\/\/www.boutique.afnor.org\/norme\/nf-iso-1656\/caoutchouc-brut-naturel-et-latex-de-caoutchouc-naturel-dosage-de-l-azote\/article\/918309\/fa195333?utm_source=UNM&amp;utm_medium=lien-texte&amp;utm_campaign=AffiliationUNM\" target=\"_blank\" rel=\"noopener\">NF ISO 1656<\/a>.<\/p><p>Pour visualiser un extrait de la norme : <a href=\"https:\/\/www.boutique.afnor.org\/xml\/redirection\/1986728?utm_source=UNM&amp;utm_medium=lien-texte&amp;utm_campaign=AffiliationUNM\" target=\"_blank\" rel=\"noopener\">NF ISO 1656<\/a>.<\/p><p>Cr\u00e9dit photo : LANXESS<\/p><p>\u00a0<\/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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Pour r\u00e9pondre \u00e0 la politique de l\u2019ISO\/TC 45 &#8220;Elastom\u00e8res et produits \u00e0 base d\u2019\u00e9lastom\u00e8res&#8221; relative au remplacement des substances pr\u00e9occupantes dans les m\u00e9thodes d\u2019essais chimiques, un nouveau catalyseur a \u00e9t\u00e9 d\u00e9fini. La nouvelle \u00e9dition de la norme NF ISO 1656 d\u00e9finit deux m\u00e9thodes, variantes du proc\u00e9d\u00e9 Kjeldahl, de d\u00e9termination de l&#8217;azote dans le caoutchouc naturel. [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":54510,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"date-de-webinaire":0,"heure-webinaire":"","duree-webinaire":"","lien-bouton-cta":"","footnotes":""},"categories":[38],"tags":[],"normes-associees":[3105],"thematique":[80],"class_list":["post-55766","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-focus-norme","normes-associees-iso-1656","thematique-caoutchouc"],"_links":{"self":[{"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/posts\/55766","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/comments?post=55766"}],"version-history":[{"count":4,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/posts\/55766\/revisions"}],"predecessor-version":[{"id":58423,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/posts\/55766\/revisions\/58423"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/media\/54510"}],"wp:attachment":[{"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/media?parent=55766"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/categories?post=55766"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/tags?post=55766"},{"taxonomy":"normes-associees","embeddable":true,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/normes-associees?post=55766"},{"taxonomy":"thematique","embeddable":true,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/thematique?post=55766"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}