{"id":206,"date":"2023-06-24T04:30:36","date_gmt":"2023-06-24T04:30:36","guid":{"rendered":"https:\/\/physigeek.com\/pt\/espectrofotometria\/"},"modified":"2023-06-24T04:30:36","modified_gmt":"2023-06-24T04:30:36","slug":"espectrofotometria","status":"publish","type":"post","link":"https:\/\/physigeek.com\/pt\/espectrofotometria\/","title":{"rendered":"Espectrofotometria"},"content":{"rendered":"<p>Este artigo explica o que \u00e9 espectrofotometria. Ent\u00e3o voc\u00ea encontrar\u00e1 a defini\u00e7\u00e3o de espectrofotometria, o que \u00e9 espectrofot\u00f4metro e para que serve a espectrofotometria. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%C2%BFQue-es-la-espectrofotometria\"><\/span> O que \u00e9 espectrofotometria?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> <strong>A espectrofotometria<\/strong> \u00e9 uma t\u00e9cnica que mede a quantidade de luz absorvida por uma subst\u00e2ncia qu\u00edmica. Al\u00e9m disso, a espectrofotometria permite determinar a concentra\u00e7\u00e3o de um composto qu\u00edmico, pois a quantidade de luz absorvida depende da concentra\u00e7\u00e3o.<\/p>\n<p> A espectrofotometria baseia-se no princ\u00edpio de que quanto maior a concentra\u00e7\u00e3o de um produto qu\u00edmico, mais luz ele absorve. Assim, a concentra\u00e7\u00e3o de uma amostra pode ser determinada a partir da quantidade de luz que ela absorve.<\/p>\n<p> Em geral, a espectrofotometria utiliza radia\u00e7\u00e3o ultravioleta, luz vis\u00edvel e radia\u00e7\u00e3o infravermelha. A radia\u00e7\u00e3o ultravioleta e a radia\u00e7\u00e3o infravermelha s\u00e3o invis\u00edveis ao olho humano e seu comprimento de onda varia de aproximadamente 100 a 400 nm e 700 a 1000 nm, respectivamente. Por outro lado, a luz vis\u00edvel \u00e9 a regi\u00e3o do espectro eletromagn\u00e9tico que nossos olhos podem perceber e seu comprimento de onda abrange uma faixa entre aproximadamente 380 nm e 750 nm.<\/p>\n<p> A espectrofotometria \u00e9 muito \u00fatil em f\u00edsica e qu\u00edmica, pois todas as subst\u00e2ncias podem absorver energia luminosa. logicamente Embora a quantidade de luz absorvida dependa da estrutura das mol\u00e9culas e das caracter\u00edsticas da subst\u00e2ncia. Por exemplo, as diferentes cores das subst\u00e2ncias se devem ao fato de que cada uma absorve luz com comprimento de onda diferente. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"La-espectrofotometria-y-la-ley-de-Lambert-Beer\"><\/span> Espectrofotometria e lei de Lambert-Beer<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Na espectrofotometria, a <strong>lei de Lambert-Beer<\/strong> \u00e9 muito importante, pois relaciona a quantidade de luz absorvida por uma solu\u00e7\u00e3o com a sua concentra\u00e7\u00e3o.<\/p>\n<p> Assim, a f\u00f3rmula da lei de Lambert-Beer \u00e9 a seguinte:<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-0f13498692ca5a39d0d9fc70c70b04ca_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\displaystyle A=\\log\\frac{I_0}{I}=\\varepsilon\\cdot\\ell \\cdot c\" title=\"Rendered by QuickLaTeX.com\" height=\"36\" width=\"155\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p style=\"margin-bottom:5px\"> Ouro: <\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-816b613a4f79d4bf9cb51396a9654120_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"A\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"13\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 a absorv\u00e2ncia, ou seja, a quantidade de luz absorvida. <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-a388cb824462284238cced83860611ce_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"I_0\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"15\" style=\"vertical-align: -3px;\"><\/p>\n<p> \u00e9 a intensidade da luz que entra. <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-14b16a74c9ddcc6f9be3e94b9c8d8f08_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"I\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"9\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 a intensidade da luz de sa\u00edda. <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-43ad9834133cf0cf160ceb6f8c4b6c2b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\varepsilon\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"8\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 o coeficiente de extin\u00e7\u00e3o, que \u00e9 uma constante de proporcionalidade. <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-a01f1555785d2234d4294020a2e3968a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\ell\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"8\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 o comprimento percorrido pela luz no meio.<\/span><\/li>\n<li><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-276a76eafbebc4494deafceec7cc4ddd_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"c\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"8\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 a concentra\u00e7\u00e3o da subst\u00e2ncia que absorve luz.<\/span><\/li>\n<\/ul>\n<p> Esta f\u00f3rmula s\u00f3 \u00e9 v\u00e1lida para solu\u00e7\u00f5es dilu\u00eddas, ou seja, s\u00f3 \u00e9 v\u00e1lida para l\u00edquidos.<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Espectrofotometro\"><\/span> espectrofot\u00f4metro<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> O <strong>espectrofot\u00f4metro<\/strong> \u00e9 o instrumento que permite a realiza\u00e7\u00e3o da espectrofotometria. Em outras palavras, o espectrofot\u00f4metro \u00e9 um dispositivo utilizado para medir a intensidade da luz absorvida.<\/p>\n<p> Um espectrofot\u00f4metro tamb\u00e9m pode ser usado para avaliar a cor de um objeto; na verdade, as aplica\u00e7\u00f5es de um espectrofot\u00f4metro s\u00e3o virtualmente infinitas.<\/p>\n<p> Com um espectrofot\u00f4metro voc\u00ea pode analisar praticamente qualquer tipo de objeto: l\u00edquidos, pl\u00e1sticos, tecidos, metal, papel\u2026 Mesmo que normalmente se estudem solu\u00e7\u00f5es.<\/p>\n<p> Ressalta-se que o espectrofot\u00f4metro \u00e9 a uni\u00e3o de dois instrumentos distintos: o espectr\u00f4metro e o fot\u00f4metro. Por um lado, o espectr\u00f4metro \u00e9 o dispositivo que produz luz com comprimento de onda desejado e, por outro lado, o fot\u00f4metro \u00e9 respons\u00e1vel por medir a intensidade da luz absorvida pela amostra. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Aplicaciones-de-la-espectrofotometria\"><\/span> Aplica\u00e7\u00f5es da espectrofotometria<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Embora possa n\u00e3o parecer \u00f3bvio para voc\u00ea, a espectrofotometria tem muitas aplica\u00e7\u00f5es na vida di\u00e1ria. Nesta se\u00e7\u00e3o veremos o uso desta metodologia.<\/p>\n<p> No setor alimentar, a espectrofotometria \u00e9 utilizada para realizar controlos de qualidade, pois permite determinar a concentra\u00e7\u00e3o de determinadas subst\u00e2ncias nos alimentos.<\/p>\n<p> Da mesma forma, a espectrofotometria tamb\u00e9m \u00e9 utilizada para monitorar e tratar a \u00e1gua, pois se a \u00e1gua tiver uma concentra\u00e7\u00e3o muito elevada de determinados elementos qu\u00edmicos, ela \u00e9 considerada contaminada e, portanto, n\u00e3o pot\u00e1vel.<\/p>\n<p> Da mesma forma, a espectrofotometria tamb\u00e9m \u00e9 utilizada para monitorar a qualidade ambiental. Os laborat\u00f3rios realizam testes espectrofotom\u00e9tricos para analisar subst\u00e2ncias qu\u00edmicas.<\/p>\n<p> Na ind\u00fastria t\u00eaxtil, a espectrofotometria \u00e9 utilizada para determinar a composi\u00e7\u00e3o qu\u00edmica dos materiais. Este ramo da ci\u00eancia tamb\u00e9m pode ser utilizado para conhecer a composi\u00e7\u00e3o das tintas utilizadas.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Este artigo explica o que \u00e9 espectrofotometria. Ent\u00e3o voc\u00ea encontrar\u00e1 a defini\u00e7\u00e3o de espectrofotometria, o que \u00e9 espectrofot\u00f4metro e para que serve a espectrofotometria. O que \u00e9 espectrofotometria? A espectrofotometria \u00e9 uma t\u00e9cnica que mede a quantidade de luz absorvida por uma subst\u00e2ncia qu\u00edmica. Al\u00e9m disso, a espectrofotometria permite determinar a concentra\u00e7\u00e3o de um composto &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/physigeek.com\/pt\/espectrofotometria\/\"> <span class=\"screen-reader-text\">Espectrofotometria<\/span> Leia mais &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"","footnotes":""},"categories":[13],"tags":[],"class_list":["post-206","post","type-post","status-publish","format-standard","hentry","category-optico"],"yoast_head":"<!-- This site is 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