Pre-concentration of Cd and Pb in water samples by automated cloud point extraction and quantification by isotope dilution ICP-MS - Giné-Rosias, Maria Fernanda Georgina; Reis, Boaventura Freire dos; Patreze, Aparecida de Fátima; Abreu Junior, Cassio Hamilton (Winter Conference on Plasma Spectrochemistry, 2008)