Mercúrio vai da atmosfera para cadeia alimentar
LIMPEZA DE peixes à beira de rio no Camboja: ingestão de mercúrio afeta ecossistema aquáticoO planeta produz milhares de toneladas de mercúrio, que, após ser expelido para a atmosfera, retorna com a chuva ou a neve, pousando em qualquer parte do globo e invadindo o ecossistema aquático. Nele, este metal, potencialmente venenoso, entra na cadeia alimentar e é responsável pela morte de um enorme contingente de peixes. As transformações químicas por que o elemento passa durante esta trajetória são tema de um estudo da Universidade de Washington Bothell, divulgado ontem na edição online da revista "Nature".O mercúrio pode permanecer suspenso por longos períodos entre a troposfera superior e a atmosfera inferior, área onde passa por uma transformação: de mercúrio elementar para oxidado.- A atmosfera superior atua como um reator químico, onde o mercúrio torna-se mais apto para ser depositado no ecossistema - explica Seth Lyman, autor principal da pesquisa e professor assistente da Universidade de Washington Bothell.A observação foi possível graças a dados recolhidos em voos de pesquisa, promovidos entre outubro e novembro do ano passado, pelo Centro Nacional de Pesquisas Atmosféricas dos Estados Unidos.Um dispositivo, construído em Bothell, colhia amostras de ar sobre a América do Norte e Europa e gravava estas leituras a cada 2,5 minutos. O equipamento permitia identificar, no mesmo recipiente, tanto mercúrio elementar quanto oxidado - um feito cujo...
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