{"id":7679,"date":"2026-08-09T14:20:04","date_gmt":"2026-08-09T18:20:04","guid":{"rendered":"https:\/\/laboratorytesting.com\/?page_id=7679"},"modified":"2026-08-09T14:49:16","modified_gmt":"2026-08-09T18:49:16","slug":"uranium-testing","status":"publish","type":"page","link":"https:\/\/laboratorytesting.com\/pt\/resources\/radiochemistry\/uranium-testing\/","title":{"rendered":"Testes de ur\u00e2nio"},"content":{"rendered":"
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Radioqu\u00edmica - Testes com Ur\u00e2nio<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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O ur\u00e2nio (U) \u00e9 um metal radioativo presente em baixas quantidades em rochas, solo, \u00e1gua, plantas e animais. O ur\u00e2nio e seus produtos de decaimento contribuem para baixos n\u00edveis de radia\u00e7\u00e3o natural de fundo no ambiente. Concentra\u00e7\u00f5es significativas de ur\u00e2nio ocorrem naturalmente em algumas subst\u00e2ncias, como dep\u00f3sitos de fosfato e min\u00e9rios enriquecidos com ur\u00e2nio. Com o tempo, o ur\u00e2nio decai e libera ur\u00e2nio-234, r\u00e1dio-226 e rad\u00f4nio-222 no solo, na \u00e1gua e no ar. As meias-vidas dos is\u00f3topos de ur\u00e2nio s\u00e3o bastante longas: o ur\u00e2nio-238 tem 4,5 bilh\u00f5es de anos, o ur\u00e2nio-235 tem 710 milh\u00f5es de anos e o ur\u00e2nio-234 tem 250.000 anos. O r\u00e1dio-226 tamb\u00e9m tem uma meia-vida longa, de 1.600 anos, enquanto a do rad\u00f4nio-222 \u00e9 muito curta, de 3,8 dias.<\/p>\n

Embora o ur\u00e2nio seja geralmente associado apenas a armas nucleares ou usinas de energia, na verdade, ele ocorre naturalmente e \u00e9 bastante abundante. Analisar sua presen\u00e7a pode ajudar a determinar se h\u00e1 poss\u00edvel contamina\u00e7\u00e3o da \u00e1gua. Com o tempo, os efeitos da exposi\u00e7\u00e3o ao ur\u00e2nio e seus subprodutos na sa\u00fade podem levar ao c\u00e2ncer e s\u00e3o particularmente perigosos para os rins.1<\/sup>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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EPA 200.8 vs. EPA 908.0: Qual \u00e9 a diferen\u00e7a?<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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A diferen\u00e7a entre esses dois m\u00e9todos reside na forma como medem o n\u00edvel de ur\u00e2nio:<\/p>\n

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  1. O m\u00e9todo EPA 200.8 mede o n\u00edvel de ur\u00e2nio em massa (\u00b5g\/L) por meio de espectrometria de massa com plasma indutivamente acoplado (ICP-MS).<\/li>\n
  2. A norma EPA 908.0 mede o n\u00edvel de ur\u00e2nio pelo n\u00edvel de atividade (pCi\/L) utilizando um contador alfa-beta.<\/li>\n<\/ol>\n

    Para converter os resultados, voc\u00ea deve multiplicar ou dividir o resultado por um fator de convers\u00e3o de 0,67.<\/p>\n

    \u00b5g\/L*0,67=pCi\/L OU<\/span> (pCi\/L)\/0,67=\u00b5g\/L<\/em><\/p>\n

    A an\u00e1lise \u00e9 apresentada em uma unidade padr\u00e3o de picocuries por litro (pCi\/L) ou microgramas por litro (\u00b5g\/L).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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    Recipiente para coleta de amostras de \u00e1gua<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Frasco para degusta\u00e7\u00e3o:<\/strong> 500 mL
    ID do produto EMSL:<\/strong> 8714205
    Conservante:<\/strong> 5 mL de \u00e1cido n\u00edtrico
    Requisitos de envio:<\/strong> N\u00e3o precisa de gelo
    Tempo de espera:<\/strong> 6 meses a partir da coleta
    Limite de detec\u00e7\u00e3o do m\u00e9todo EPA 200.8 para ur\u00e2nio:<\/strong> 1 \u00b5g\/L
    Limite de detec\u00e7\u00e3o do m\u00e9todo EPA 908 para ur\u00e2nio:<\/strong> 0,67 pCi\/L<\/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

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    Diretrizes para Testes Radiol\u00f3gicos<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Resultados Alfa\/Beta Brutos<\/strong><\/th>Contamina\u00e7\u00e3o potencial<\/strong><\/th>Testes adicionais recomendados<\/strong><\/th>\n<\/tr>\n<\/thead>\n
    < 5 pCi\/L<\/td>N\u00edveis de fundo<\/td>Nenhum<\/td>\n<\/tr>\n
    5-15 pCi\/L<\/td>Poss\u00edvel r\u00e1dio<\/td>R\u00e1dio 226 e 228<\/td>\n<\/tr>\n
    > 15 pCi\/L<\/td>Poss\u00edvel r\u00e1dio e ur\u00e2nio<\/td>R\u00e1dio 226, 228 e Ur\u00e2nio<\/td>\n<\/tr>\n
    Tratamento recomendado se:<\/div><\/td>\n<\/tr>\n
    R\u00e1dio-226 + R\u00e1dio-228 > 5 pCi\/L OU
    \nAlfa bruto \u2013 Ur\u00e2nio > 15 pCi\/L OU
    \nUr\u00e2nio > 30 \u00b5g\/L<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Lei da \u00c1gua Pot\u00e1vel Segura (SDWA)
    \nPadr\u00f5es3,4<\/sup><\/th>    		Limite m\u00e1ximo de contaminantes
    \n(MCL)<\/th>\n<\/tr>\n<\/thead>\n
    Ur\u00e2nio<\/td>30 \u00b5g\/L<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\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
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    ICP-MS<\/em><\/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

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    Contador Alfa\/Beta<\/em><\/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

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    Contador Alfa\/Beta<\/em><\/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

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    1<\/sup> (Ur\u00e2nio) \u2013 https:\/\/semspub.epa.gov\/work\/HQ\/175267.pdf<\/a>
    2<\/sup> (Radionucl\u00eddeos) \u2013     https:\/\/www.epa.gov\/dwreginfo\/radionuclides-rule<\/a>
    3<\/sup> (Radionucl\u00eddeos) \u2013     https:\/\/nepis.epa.gov\/Exe\/ZyPDF.cgi?Dockey=30006644.txt<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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    CUIDADO: <\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Os frascos para coleta de amostras cont\u00eam \u00e1cido n\u00edtrico como conservante, que pode facilmente causar queimaduras na pele e nas roupas. Por favor, use luvas ao manusear os frascos, evite ench\u00ea-los em excesso e respingar o conte\u00fado sobre voc\u00ea.<\/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

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    O que \u00e9 um is\u00f3topo? <\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Qualquer uma de duas ou mais esp\u00e9cies de \u00e1tomos de um elemento qu\u00edmico com o mesmo n\u00famero at\u00f4mico e comportamento qu\u00edmico quase id\u00eantico, mas com massa at\u00f4mica ou n\u00famero de massa diferente e propriedades f\u00edsicas diferentes.<\/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

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    O que \u00e9 meia-vida?<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    O tempo necess\u00e1rio para que uma subst\u00e2ncia radioativa perca 50% de sua radioatividade por decaimento \u00e9 conhecido como meia-vida.<\/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

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    Estado de origem<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Em 03\/12\/2020, n\u00f3s pode<\/span><\/strong> Aceitar amostras de:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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    Alabama<\/td>Indiana<\/td>Nova Iorque<\/td>\n<\/tr>\n
    Colorado<\/td>Louisiana<\/td>Oklahoma<\/td>\n<\/tr>\n
    Connecticut<\/td>Maine<\/td>Pensilv\u00e2nia<\/td>\n<\/tr>\n
    Delaware<\/td>Maryland<\/td>Rhode Island<\/td>\n<\/tr>\n
    Distrito de Col\u00fambia<\/td>Massachusetts<\/td>Vermont<\/td>\n<\/tr>\n
    Fl\u00f3rida<\/td>Nova Hampshire<\/td>Virg\u00ednia<\/td>\n<\/tr>\n
    Ge\u00f3rgia<\/td>Nova Jersey<\/td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\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
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    Em 03\/12\/2020, n\u00f3s n\u00e3o pode<\/span><\/strong> Aceitar amostras de:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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    Alasca<\/td>Minnesota<\/td>Oregon<\/td>\n<\/tr>\n
    Arizona<\/td>Missouri<\/td>Carolina do Sul<\/td>\n<\/tr>\n
    Arkansas<\/td>Mississippi<\/td>Dakota do Sul<\/td>\n<\/tr>\n
    Calif\u00f3rnia<\/td>Montana<\/td>Tennessee<\/td>\n<\/tr>\n
    Hava\u00ed<\/td>Nebraska<\/td>Texas<\/td>\n<\/tr>\n
    Idaho<\/td>Nevada<\/td>Utah<\/td>\n<\/tr>\n
    Illinois<\/td>Novo M\u00e9xico<\/td>Washington<\/td>\n<\/tr>\n
    Iowa<\/td>Carolina do Norte<\/td>Virg\u00ednia Ocidental<\/td>\n<\/tr>\n
    Kansas<\/td>Dakota do Norte<\/td>Wisconsin<\/td>\n<\/tr>\n
    Kentucky<\/td>Ohio<\/td>Wyoming<\/td>\n<\/tr>\n
    Michigan<\/td><\/td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Radiochemistry – Uranium Testing Uranium (U) is a radioactive metal present in low amounts in rock, soil, water, plants, and animals. Uranium and its decay products contribute to low levels of natural background radiation in the environment. Significant concentrations of […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":7385,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"content-type":"","footnotes":""},"class_list":["post-7679","page","type-page","status-publish","hentry","slug-uranium-testing","odd_post_id"],"_links":{"self":[{"href":"https:\/\/laboratorytesting.com\/pt\/wp-json\/wp\/v2\/pages\/7679","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/laboratorytesting.com\/pt\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/laboratorytesting.com\/pt\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/laboratorytesting.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/laboratorytesting.com\/pt\/wp-json\/wp\/v2\/comments?post=7679"}],"version-history":[{"count":16,"href":"https:\/\/laboratorytesting.com\/pt\/wp-json\/wp\/v2\/pages\/7679\/revisions"}],"predecessor-version":[{"id":7697,"href":"https:\/\/laboratorytesting.com\/pt\/wp-json\/wp\/v2\/pages\/7679\/revisions\/7697"}],"up":[{"embeddable":true,"href":"https:\/\/laboratorytesting.com\/pt\/wp-json\/wp\/v2\/pages\/7385"}],"wp:attachment":[{"href":"https:\/\/laboratorytesting.com\/pt\/wp-json\/wp\/v2\/media?parent=7679"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}