Multicommutation flow system with on line preconcentration for Cd, Ni and Pb determination by ICP-AES - Miranda, Carlos Eduardo Saraiva; Baccan, Nivaldo; Reis, Boaventura Freire dos; Giné-Rosias, Maria Fernanda Georgina; Packer, Ana Paula; Gervásio, Ana Paula G (Flow Analysis, 1997)