{"id":4882,"date":"2026-08-13T13:56:27","date_gmt":"2026-08-13T05:56:27","guid":{"rendered":"https:\/\/www.pgeneral.com\/?p=4882"},"modified":"2026-08-13T13:56:27","modified_gmt":"2026-08-13T05:56:27","slug":"determination-of-lead-in-sodium-pyrophosphate-food-additive","status":"publish","type":"post","link":"https:\/\/www.pgeneral.com\/fr\/applications\/determination-of-lead-in-sodium-pyrophosphate-food-additive","title":{"rendered":"Dosage du plomb dans l'additif alimentaire pyrophosphate de sodium"},"content":{"rendered":"

1 Aper\u00e7u de la m\u00e9thode<\/b><\/strong><\/h2>\n

Apr\u00e8s pr\u00e9traitement de l'\u00e9chantillon, les ions plomb forment un complexe avec le di\u00e9thyldithiocarbamate de sodium (DDTC) dans des conditions de pH sp\u00e9cifiques. Ce complexe est extrait et s\u00e9par\u00e9 \u00e0 l'aide de 4-m\u00e9thyl-2-pentanone (MIBK), puis introduit dans un spectrom\u00e8tre d'absorption atomique pour atomisation par flamme. L'absorbance est mesur\u00e9e \u00e0 une longueur d'onde de 283,3 nm. Dans une certaine gamme de concentrations, l'absorbance du plomb est proportionnelle \u00e0 sa concentration massique, et sa quantification est r\u00e9alis\u00e9e par comparaison avec une gamme \u00e9talon.<\/p>\n

2. Champ d'application<\/b><\/strong><\/h2>\n

Cette m\u00e9thode s'applique au dosage du plomb dans l'additif alimentaire pyrophosphate de sodium.<\/p>\n

3 Normes de r\u00e9f\u00e9rence<\/b><\/strong><\/h2>\n

GB 25557-2010 Norme nationale de s\u00e9curit\u00e9 alimentaire \u2013 Additif alimentaire Pyrophosphate de sodium, Section A.10 D\u00e9termination du plomb<\/p>\n

4 Instruments, \u00e9quipements et r\u00e9actifs<\/b><\/strong><\/h2>\n

4.1 Instruments et \u00e9quipements<\/b><\/strong><\/h3>\n

4.1.1 Instruments analytiques<\/b><\/strong><\/h4>\n

feuille<\/p>\n\n\n\n\n\n\n
- Non, non.<\/b><\/strong><\/td>\nNom<\/b><\/strong><\/td>\nQuantit\u00e9<\/b><\/strong><\/td>\nExigences techniques<\/b><\/strong><\/td>\nAccessoires<\/b><\/strong><\/td>\n<\/tr>\n
1<\/td>\nSpectrophotom\u00e8tre d'absorption atomique de flamme<\/td>\n1 ensemble<\/td>\n\u2014<\/td>\nLampe cathodique creuse au plomb<\/td>\n<\/tr>\n
2<\/td>\nCompresseur d'air<\/td>\n1 unit\u00e9<\/td>\nPression nominale d'\u00e9chappement: 0,3 MPa<\/td>\n\u2014<\/td>\n<\/tr>\n
3<\/td>\nCylindre d'ac\u00e9tyl\u00e8ne<\/td>\n1 cylindre<\/td>\nPuret\u00e9 \u2265 99,99%<\/td>\n\u2014<\/td>\n<\/tr>\n<\/tbody>\n<\/table>","protected":false},"excerpt":{"rendered":"

1 Method Overview After sample pretreatment, lead ions form a complex with sodium diethyldithiocarbamate (DDTC) under a specific pH condition. The complex is extracted and separated using 4-methyl-2-pentanone (MIBK), then introduced into an atomic absorption spectrometer for flame atomization. Absorbance is measured at a wavelength of 283.3 nm. Within a certain concentration range, the absorbance […]<\/p>\n","protected":false},"author":2,"featured_media":4824,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[36,77],"tags":[],"class_list":["post-4882","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-applications","category-bio-tech-and-life-sciences"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.pgeneral.com\/fr\/wp-json\/wp\/v2\/posts\/4882","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pgeneral.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pgeneral.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pgeneral.com\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pgeneral.com\/fr\/wp-json\/wp\/v2\/comments?post=4882"}],"version-history":[{"count":1,"href":"https:\/\/www.pgeneral.com\/fr\/wp-json\/wp\/v2\/posts\/4882\/revisions"}],"predecessor-version":[{"id":4883,"href":"https:\/\/www.pgeneral.com\/fr\/wp-json\/wp\/v2\/posts\/4882\/revisions\/4883"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.pgeneral.com\/fr\/wp-json\/wp\/v2\/media\/4824"}],"wp:attachment":[{"href":"https:\/\/www.pgeneral.com\/fr\/wp-json\/wp\/v2\/media?parent=4882"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pgeneral.com\/fr\/wp-json\/wp\/v2\/categories?post=4882"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pgeneral.com\/fr\/wp-json\/wp\/v2\/tags?post=4882"}],"curies":[{"name":"WP","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}