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Abstract(s)
Os microplásticos são fragmentos de plástico cuja dimensão mais longa
não ultrapassa os 5 mm. Apesar dos progressos que foram conquistados,
ainda não existem métodos analíticos harmonizados para quantificar e
determinar a ocorrência e composição de microplásticos em sedimentos
marinhos. No presente trabalho foi desenvolvido um método para
extração de microplásticos em areia de praia, usando uma solução de
ZnCl2 (1,8-2,0 g/cm3
). A separação de areia de praia foi obtida por
flotação considerando as diferenças de densidade entre os diferentes
tipos de plásticos a extrair e a areia. Comparativamente a outras
metodologias existentes o método proposto apresenta boas taxas de
recuperação (92-100%) para os microplásticos selecionados (PE, PP,
PS, PVC, PET e EPS) com diferentes frações granulométricas,
permitindo que este seja aplicado em amostras reais recolhidas em
Angola. A metodologia proposta reduz substancialmente o tempo de
extração de amostras de areia e pode ser facilmente aplicada em
laboratório.
Palavras-chave: Microplásticos
Areia de praia
Técnicas de extração
Separação por densidades
Quantificação
Angola
Microplastics are plastic particles smaller than 5 mm in its longest dimension. Despite the progress made in the quantification of microplastics there isn’t a harmonized method to quantify and determine the occurrence and composition of these particles in marine sediments. In the present work an extraction method for microplastics in sandy beaches was developed, using a high-density salt solution of ZnCl2 (1,8- 2,0 g/cm3 ). Microplastics separation was obtained by flotation regarding the different densities between the types of plastics that will be extracted and the sand. Comparatively to other existing methodologies, this one presents good recovery rates (92-100%) for the selected microplastics (PE, PP, PS, PVC, PET and EPS) with different granulometric sizes, allowing the extraction of environmental samples from Angola. The proposed methodology substantially reduces the extraction time of sandy samples and can be easily applied in laboratory. Keywords: Microplastic Sandy Beach Extraction Techniques Density Separation Quantification Angola
Microplastics are plastic particles smaller than 5 mm in its longest dimension. Despite the progress made in the quantification of microplastics there isn’t a harmonized method to quantify and determine the occurrence and composition of these particles in marine sediments. In the present work an extraction method for microplastics in sandy beaches was developed, using a high-density salt solution of ZnCl2 (1,8- 2,0 g/cm3 ). Microplastics separation was obtained by flotation regarding the different densities between the types of plastics that will be extracted and the sand. Comparatively to other existing methodologies, this one presents good recovery rates (92-100%) for the selected microplastics (PE, PP, PS, PVC, PET and EPS) with different granulometric sizes, allowing the extraction of environmental samples from Angola. The proposed methodology substantially reduces the extraction time of sandy samples and can be easily applied in laboratory. Keywords: Microplastic Sandy Beach Extraction Techniques Density Separation Quantification Angola
Description
Keywords
Microplásticos Técnicas de extração Separação por densidades Quantificação Areia de praia Angola