Home Itens selecionados Provedores de dados OAI Créditos Sobre Ajuda

			Busca avançada
	Provedor de dados OMA (2) Autor Baeyens, W.F.J. (2) Lansens, P. (2) Leermakers, M. (1) Meuleman, C. (1) Tipo do documento Info:eu-repo/semantics/article (2) Ano 1990 (2) País Belgium (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Determination of methylmercury in natural waters by headspace gas chromatography with microwave-induced plasma detection after preconcentration on a resin containing dithiocarbamate groups OMA Lansens, P.; Meuleman, C.; Leermakers, M.; Baeyens, W.F.J.. A method for the determination of methylmercury at ng 1<sup>-1</sup> levels in natural waters is described. Methylmercury present in a sample is first preconcentrated on a column of a resin containing dithiocarbamate groups and eluted quantitatively with acidic thiourea solution. Methylmercury in the effluent is then converted to the iodide by addition of sulphuric acid and iodoacetic acid and determined by headspace gas chromatography with microwave-induced plasma detection. The adsorption properties of the resin are discussed. Tipo: Info:eu-repo/semantics/article Ano: 1990 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3092 Improvement of the semiautomated headspace analysis method for the determination of methylmercury in biological samples OMA Lansens, P.; Baeyens, W.F.J.. An improvement in the extraction step in the method of Decadt et al. for determining methylmercury in biological tissues is described. The methylmercury is released from the tissue by use of sulphuric acid as the cleaving agent and immediately converted to the iodide form by iodoacetic acid. These reaction steps take place in a closed headspace vial. The methylmercury iodide is then headspace-injected into a gas-chromatograph and detected with a microwave-induced plasma detector. Quantitation is accomplished by standard addition. Analysis of one sample takes less than 15 min. The detection limit of the method is 20 ng methylmercury per gram biological tissue when 50 mg of tissue are taken. Tipo: Info:eu-repo/semantics/article Ano: 1990 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3091 Registros recuperados: 2 Primeira ... 1 ... Última

Empresa Brasileira de Pesquisa Agropecuária - Embrapa Todos os direitos reservados, conforme Lei n° 9.610 Política de Privacidade Área restrita		Embrapa Parque Estação Biológica - PqEB s/n° Brasília, DF - Brasil - CEP 70770-901 Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco