{"id":634,"date":"2023-07-25T03:00:46","date_gmt":"2023-07-25T03:00:46","guid":{"rendered":"https:\/\/gsantana2005.net\/?p=634"},"modified":"2024-02-04T23:15:08","modified_gmt":"2024-02-04T23:15:08","slug":"mercurio-no-rio-madeira-1988-2023","status":"publish","type":"post","link":"https:\/\/gsantana2005.net\/index.php\/2023\/07\/25\/mercurio-no-rio-madeira-1988-2023\/","title":{"rendered":"Merc\u00fario no Rio Madeira (1988-2023)"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"200\" height=\"200\" src=\"https:\/\/gsantana2005.net\/wp-content\/uploads\/2023\/07\/wanderlei-basto.jpg\" alt=\"\" class=\"wp-image-636\" srcset=\"https:\/\/gsantana2005.net\/wp-content\/uploads\/2023\/07\/wanderlei-basto.jpg 200w, https:\/\/gsantana2005.net\/wp-content\/uploads\/2023\/07\/wanderlei-basto-150x150.jpg 150w\" sizes=\"(max-width: 200px) 100vw, 200px\" \/><\/figure>\n\n\n\n<p>Por <strong>Wanderley R. Bastos<\/strong><\/p>\n\n\n\n<p>UNIR &#8211; (<a href=\"mailto:bastoswr@unir.br\">bastoswr@unir.br<\/a>)<\/p>\n\n\n\n<p>N\u00e3o \u00e9 recente a extra\u00e7\u00e3o de ouro no Rio Madeira (principal afluente da margem direita do Rio Amazonas) fazendo-se uso de um metal fascinante e com diversas utilidades como o merc\u00fario (S\u00edmbolo qu\u00edmico Hg, do grego latinizado <em>hydrargyrum<\/em>). \u00c9 o \u00fanico elemento qu\u00edmico l\u00edquido a temperatura ambiente e essa caracter\u00edstica colabora na sua capacidade em amalgamar com alguns outros metais, a exemplo do ouro (S\u00edmbolo qu\u00edmico Au, do latim <em>aurum<\/em>). O Hg \u00e9 um elemento n\u00e3o essencial aos seres vivos e de toxicologia bem conhecida, especialmente, agindo sobre o sistema nervoso central, portanto, neurot\u00f3xico.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Os primeiros estudos<\/h2>\n\n\n\n<p>Os primeiros estudos publicados cientificamente sobre merc\u00fario no ambiente amaz\u00f4nico datam de 1988, ou seja, h\u00e1 35 anos, onde foram descritos pelos pesquisadores Pfeiffer &amp; Lacerda (1988) e Martinelli e colaboradores (1988) publicados nas revistas <strong><em>Environmental Technology Letters<\/em><\/strong> e <strong><em>Ambio<\/em><\/strong>, respectivamente. A partir de ent\u00e3o, as investiga\u00e7\u00f5es para compreender a din\u00e2mica biogeoqu\u00edmica do Hg, especialmente nos ecossistemas aqu\u00e1ticos, passaram a ser constantes em toda a regi\u00e3o Amaz\u00f4nia, principalmente nas bacias hidrogr\u00e1ficas dos rios Madeira (RO e AM) e Tapaj\u00f3s (PA). <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">A sequ\u00eancia de estudos<\/h2>\n\n\n\n<p>Na sequ\u00eancia os estudos mostraram que o Hg n\u00e3o vinha apenas da fonte do garimpo de ouro, mas que ele estava tamb\u00e9m presente nos solos da Amaz\u00f4nia, que por centenas de milhares de anos recebem deposi\u00e7\u00f5es atmosf\u00e9ricas consideradas de origem natural, provenientes dos gases vulc\u00e2nicos. Portanto, o desmatamento\/queimada \u00e9 uma a\u00e7\u00e3o contribuidora de merc\u00fario para os ecossistemas aqu\u00e1ticos da regi\u00e3o, pois desprotegem esses solos possibilitando sua lixivia\u00e7\u00e3o para os ecossistemas aqu\u00e1ticos. Importante registrar que o merc\u00fario \u00e9 um Poluente Global, registra-se sua presen\u00e7a em todo o planeta.<\/p>\n\n\n\n<p>N\u00e3o importando a fonte de lan\u00e7amento de merc\u00fario, hoje se conhece bem os processos de sua transforma\u00e7\u00e3o qu\u00edmica, ou seja, o Hg inorg\u00e2nico se transforma em org\u00e2nico (Metil-merc\u00fario &#8211; MeHg), processo promovido em maior propor\u00e7\u00e3o pelos microorganismos. Essa transforma\u00e7\u00e3o qu\u00edmica o faz se concentrar muito r\u00e1pida e eficientemente na biota. Portanto, naturalmente quem consome mais peixe tem concentra\u00e7\u00f5es de merc\u00fario mais elevadas no seu organismo, que pode ser detectado por meio do sangue e\/ou cabelo. E sua a\u00e7\u00e3o t\u00f3xica atinge o sistema nervoso central. A sua toxicologia \u00e9 muito bem conhecida do ponto de vista cient\u00edfico.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">A biogeoqu\u00edmica do merc\u00fario no Rio Madeira<\/h2>\n\n\n\n<p>Em rela\u00e7\u00e3o a biogeoqu\u00edmica do merc\u00fario no Rio Madeira, conduzimos um estudo de longa dura\u00e7\u00e3o, trimestral e ininterrupto desde 2008 estudando a din\u00e2mica do merc\u00fario nos compartimentos ambientais: \u00e1gua, sedimentos (suspensos e de fundo), plantas aqu\u00e1ticas, pl\u00e2nctons e os peixes. Nos peixes focamos nossas observa\u00e7\u00f5es avaliando os diversos n\u00edveis tr\u00f3ficos, ou seja, os peixes de diferentes h\u00e1bitos alimentares. Isso porque o merc\u00fario \u00e9 um elemento qu\u00edmico diferente dos demais, sobretudo por se ampliar na medida em que os organismos sobem na cadeia alimentar. O que significa que o peixe que ingere outros peixes apresenta as concentra\u00e7\u00f5es mais elevadas, chamamos esse processo de biomagnifica\u00e7\u00e3o. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">O merc\u00fario no pescado do Rio Madeira<\/h2>\n\n\n\n<p>Essa informa\u00e7\u00e3o \u00e9 importante, pois n\u00e3o h\u00e1 necessidade em se alarmar a popula\u00e7\u00e3o, especialmente \u00e0quela que s\u00f3 tem essa fonte de prote\u00edna animal para se alimentar, e dessa forma orientar quais esp\u00e9cies de peixes devem ser priorizadas para o consumo. A seguir segue as concentra\u00e7\u00f5es m\u00e9dias de Hg no pescado do Rio Madeira, mas antes \u00e9 importante apresentar os valores de refer\u00eancia de merc\u00fario em peixes fornecida pela Ag\u00eancia Nacional de Vigil\u00e2ncia Sanit\u00e1ria (ANVISA). <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">A quantidade de merc\u00fario no pescado<\/h3>\n\n\n\n<p>Para as esp\u00e9cies de peixes n\u00e3o carn\u00edvoras \u00e9 de 0,50 mg\/kg e para as esp\u00e9cies carn\u00edvoras 1,00 mg\/kg. At\u00e9 o momento em nosso grupo de pesquisa (Laborat\u00f3rio de Biogeoqu\u00edmica Ambiental\/UNIR) temos cerca de <strong>13mil <\/strong>peixes (tecido muscular) quantificados as concentra\u00e7\u00f5es de merc\u00fario (Bastos et al 2015; Mussy et al 2022; <a href=\"https:\/\/biogeoqu\u00edmica.unir.br\/aquivo\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">https:\/\/biogeoqu\u00edmica.unir.br\/aquivo<\/a>). <\/p>\n\n\n\n<p>Os peixes n\u00e3o carn\u00edvoros apresentam m\u00e9dia de concentra\u00e7\u00e3o de merc\u00fario de 0,30 mg\/kg (limite 0,50 mg\/kg) e os carn\u00edvoros com m\u00e9dia de concentra\u00e7\u00e3o de merc\u00fario de 0,90 mg\/kg (limite 1,00 mg\/kg). Embora as concentra\u00e7\u00f5es m\u00e9dias n\u00e3o estejam ultrapassando a legisla\u00e7\u00e3o brasileira recomenda-se dar preferencia ao consumo das esp\u00e9cies n\u00e3o carn\u00edvoras, especialmente a popula\u00e7\u00e3o ribeirinha, a exemplo do curimat\u00e1, branquinha, pac\u00fa, sardinha, piau dentre outros. Evitando algumas esp\u00e9cies carn\u00edvoras, a exemplo de pintadinho (piracatinga), barba chata, peixe cachorro, tucunar\u00e9 e piranha preta. Importante tamb\u00e9m informar que os tambaquis de piscicultura de Rond\u00f4nia apresentam concentra\u00e7\u00f5es inferiores aos peixes de rio e se apresentam abaixo dos limites da ANVISA.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">A frase final<\/h2>\n\n\n\n<p>Na Amaz\u00f4nia, \u00e9 fundamental que as investiga\u00e7\u00f5es referentes as concentra\u00e7\u00f5es de merc\u00fario no pescado, assim como na popula\u00e7\u00e3o ribeirinha, sejam constantemente monitoradas.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>Refer\u00eancias<\/strong><\/p>\n\n\n\n<p>Bastos, W. R., D\u00f3rea, J. G., Bernardi, J. V. E., Lauthartte, L. C., Mussy, M. H., Lacerda, L. D., &amp; Malm, O. (<strong>2015)<\/strong>.&nbsp;Mercury in fish of the Madeira River (temporal and spatial assessment), Brazilian Amazon. <strong><em>Environmental Research<\/em><\/strong><em>, 140, 191\u2013197.<\/em>&nbsp;doi:10.1016\/j.envres.2015.03.029.<\/p>\n\n\n\n<p><a href=\"https:\/\/biogeoquimica.unir.br\/arquivo\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/biogeoquimica.unir.br\/arquivo<\/a>. Acesso aos trabalhos cient\u00edficos do Grupo Biogeoqu\u00edmica Ambiental da Universidade Federal de Rond\u00f4nia. (<strong>2023<\/strong>).<\/p>\n\n\n\n<p>Martinelli, L.A.; Ferreira, L.R.; Forsberg, B.R.; Victoria, R.L. (<strong>1988)<\/strong>. Mercury contamination in the Amazon: a gold rush consequence. <strong><em>Ambio<\/em><\/strong>, 17: 252-254.<\/p>\n\n\n\n<p>Mussy, M.H., de Almeida, R., de Carvalho, D.P., Lauthartte, L.C., Holanda, I.B.B., Almeida, M.G., Sousa-Filho, I.F., Rezende, C.E., Malm, O., Bastos, W.R. (<strong>2022)<\/strong>. Evaluating total mercury and methylmercury biomagnification using stable isotopes of carbon and nitrogen in fish from the Madeira River basin, Brazilian Amazon.&nbsp;<strong><em>Environmental Science Pollutant Research<\/em><\/strong>&nbsp;30, 33543\u201333554. https:\/\/doi.org\/10.1007\/s11356-022-24235-7.<\/p>\n\n\n\n<p>Pfeiffer, W.C.; Lacerda, L.D. (<strong>1988)<\/strong>. Mercury Inputs into the Amazon Region, Brazil. <strong><em>Environmental Technology Letters<\/em><\/strong>, 9: 325-330.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Por Wanderley R. Bastos UNIR &#8211; (bastoswr@unir.br) N\u00e3o \u00e9 recente a extra\u00e7\u00e3o de ouro no Rio Madeira (principal afluente da margem direita do Rio Amazonas) fazendo-se uso de um metal fascinante e com diversas utilidades como o merc\u00fario (S\u00edmbolo qu\u00edmico Hg, do grego latinizado hydrargyrum). \u00c9 o \u00fanico elemento qu\u00edmico l\u00edquido a temperatura ambiente e [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":635,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[2,275],"tags":[656,655,377,654,660,658,659,657],"class_list":["post-634","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ambiente","category-conservacao-ambiental","tag-biogeoquimica-do-mercurio","tag-biomagnificacao","tag-gestao-ambiental","tag-mercurio-na-amazonia","tag-monitoramento-ambiental","tag-rio-madeira","tag-sustentabilidade-amazonica","tag-toxicologia-ambiental"],"aioseo_notices":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.5 - 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