Avaliação em microcosmo da influência de nanopartículas (hidroxiapatita e PLGA) sobre o comportamento químico de Zn, Cu e Mn em sistema costeiro degradado
DOI:
https://doi.org/10.15392/bjrs.v7i3.857Keywords:
nanoparticles, polluted aquatic environment, microcosm essayAbstract
A liberação de diversos tipos de nanopartículas no ambiente aquático pode resultar na exposição direta ou indireta do homem e de organismos aquáticos, ou impactos no comportamento de metais. A ausência de legislação ambiental específica para o descarte de rejeitos oriundos de atividades que utilizam nanopartículas, como centros de pesquisa, serviços de medicina nuclear e a indústria, tem contribuído para a liberação descontrolada desses materiais no meio ambiente tornando-os relevantes dentro do contexto ecotoxicológico. Neste estudo, nanopartículas (nanohidroxiapatita e ácido D, L-láctico-co-glicólico - PLGA) com uso promissor pela medicina nuclear foram avaliadas por ensaios em microcosmos, reproduzindo-se as condições do Canal do Cunha (RJ), sistema aquático costeiro, impactado por rejeitos industriais, domésticos e hospitalar, com elevados teores em metais e materiais orgânicos, já reportados na literatura. Os resultados deste estudo não identificaram impactos dos diferentes nanomateriais no comportamento de metais dissolvidos (Cu, Mn e Zn), na concentração testada, provavelmente devido ao desenvolvimento de uma emulsão bacteriana nos microcosmos, que promoviam flutuações atípicas na concentração dos metais dissolvidos, principalmente Cu e Zn. Estudos similares com nanomateriais em concentrações superiores às testadas são indicados para corpos d´água em nível avançado de degradação qualitativa.
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