{"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\/pt\/applications\/determination-of-lead-in-sodium-pyrophosphate-food-additive","title":{"rendered":"Determina\u00e7\u00e3o de chumbo no aditivo alimentar pirofosfato de s\u00f3dio"},"content":{"rendered":"<h2><strong><b>1 Resumo do M\u00e9todo<\/b><\/strong><\/h2>\n<p>Ap\u00f3s o pr\u00e9-tratamento da amostra, os \u00edons de chumbo formam um complexo com dietilditiocarbamato de s\u00f3dio (DDTC) sob condi\u00e7\u00f5es espec\u00edficas de pH. O complexo \u00e9 extra\u00eddo e separado utilizando 4-metil-2-pentanona (MIBK), sendo ent\u00e3o introduzido em um espectr\u00f4metro de absor\u00e7\u00e3o at\u00f4mica por atomiza\u00e7\u00e3o em chama. A absorb\u00e2ncia \u00e9 medida em um comprimento de onda de 283,3 nm. Dentro de uma determinada faixa de concentra\u00e7\u00e3o, a absorb\u00e2ncia do chumbo \u00e9 proporcional \u00e0 sua massa, e a quantifica\u00e7\u00e3o \u00e9 realizada por compara\u00e7\u00e3o com uma s\u00e9rie de padr\u00f5es.<\/p>\n<h2><strong><b>2. \u00c2mbito de aplica\u00e7\u00e3o<\/b><\/strong><\/h2>\n<p>Este m\u00e9todo aplica-se \u00e0 determina\u00e7\u00e3o de chumbo no aditivo alimentar pirofosfato de s\u00f3dio.<\/p>\n<h2><strong><b>3 Padr\u00f5es de Refer\u00eancia<\/b><\/strong><\/h2>\n<p>GB 25557-2010 Norma Nacional de Seguran\u00e7a Alimentar \u2013 Aditivo Alimentar Pirofosfato de S\u00f3dio, Se\u00e7\u00e3o A.10 Determina\u00e7\u00e3o de Chumbo<\/p>\n<h2><strong><b>4. Instrumentos, Equipamentos e Reagentes<\/b><\/strong><\/h2>\n<h3><strong><b>4.1 Instrumentos e equipamento<\/b><\/strong><\/h3>\n<h4><strong><b>4.1.1 Instrumentos Anal\u00edticos<\/b><\/strong><\/h4>\n<p>folha<\/p>\n<table>\n<tbody>\n<tr>\n<td><strong><b>N\u00e3o.<\/b><\/strong><\/td>\n<td><strong><b>Nome<\/b><\/strong><\/td>\n<td><strong><b>Quantidade<\/b><\/strong><\/td>\n<td><strong><b>Requisitos T\u00e9cnicos<\/b><\/strong><\/td>\n<td><strong><b>Acess\u00f3rios<\/b><\/strong><\/td>\n<\/tr>\n<tr>\n<td>1<\/td>\n<td>Espetrofotometro de Absor\u00e7\u00e3o At\u00f4mica de Flame<\/td>\n<td>1 conjunto<\/td>\n<td>\u2014<\/td>\n<td>Lead Hollow Cathode Lamp<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>Compressor de ar<\/td>\n<td>1 unidade<\/td>\n<td>Press\u00e3o de escape estimada: 0,3 MPa<\/td>\n<td>\u2014<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>Cilindro de acetileno<\/td>\n<td>1 cilindro<\/td>\n<td>Pureza \u2265 99,99%<\/td>\n<td>\u2014<\/td>\n<\/tr>\n<\/tbody>\n<\/table>","protected":false},"excerpt":{"rendered":"<p>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 [&hellip;]<\/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\/pt\/wp-json\/wp\/v2\/posts\/4882","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pgeneral.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pgeneral.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pgeneral.com\/pt\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pgeneral.com\/pt\/wp-json\/wp\/v2\/comments?post=4882"}],"version-history":[{"count":1,"href":"https:\/\/www.pgeneral.com\/pt\/wp-json\/wp\/v2\/posts\/4882\/revisions"}],"predecessor-version":[{"id":4883,"href":"https:\/\/www.pgeneral.com\/pt\/wp-json\/wp\/v2\/posts\/4882\/revisions\/4883"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.pgeneral.com\/pt\/wp-json\/wp\/v2\/media\/4824"}],"wp:attachment":[{"href":"https:\/\/www.pgeneral.com\/pt\/wp-json\/wp\/v2\/media?parent=4882"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pgeneral.com\/pt\/wp-json\/wp\/v2\/categories?post=4882"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pgeneral.com\/pt\/wp-json\/wp\/v2\/tags?post=4882"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}