Data/hora: 06/06/2024 18:09:58

Provedor de dados: 	42	
País: 	Brazil	
Título: 	Application of modified simplex on the development of a preconcentration system for cadmium determination in sediments, food and cigarettes	
Autores: 	SANTOS,QUEILA O.; MORENO,ISLANIA; SANTOS,LEANDRO DOS; SANTOS,ALDENOR G.; SOUZA,VALDINEI S.; BEZERRA,MARCOS A.	
Data: 	2016-06-01	
Ano: 	2016	
Palavras-chave: 	Simplex optimization; Preconcentration; Cadmium; Sediments; Cigarettes; Food.	
Resumo: 	A modified simplex algorithm was used to optimize a system of preconcentration for cadmium determination in samples of sediments, cigarettes and food using flame atomic absorption spectrometry. The preconcentration system is based on the sorption of cadmium in a minicolumn packed with Amberlite XAD-2 resin functionalized with 3,4-dihydroxybenzoic acid (DHB). The optimized variables were pH and sampling flow rate and the optimum conditions found for these variables were, respectively 8.7 and 8.8 mL min-1. The developed system showed a preconcentration factor of 15.3, detection limit of 0.49 µg L-1, quantification limit of 1.65 µg L-1 and precision expressed as relative standard deviation (% RSD, n=10) of 5.9. The accuracy of the method was checked by analysis of estuary sediment certified reference material (NIST 1646-1). The cadmium concentrations found in sediment samples ranged from 1.73 and 1.90 µg g-1. In cigarette samples the results were 0.085 and 0.193 µg g-1, and in food samples (coriander and lettuce) the concentrations found of this metal were, respectively, 0.33 and 0.12 µg g-1.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300791	
Editor: 	Academia Brasileira de Ciências	
Relação: 	10.1590/0001-3765201620150209	
Formato: 	text/html	
Fonte: 	Anais da Academia Brasileira de Ciências  v.88 n.2 2016	
Fonte: 	info:eu-repo/semantics/openAccess