TY - GEN AU - Melquiades,F L AU - Parreira,P S AU - Yabe,M J AU - Corazza,M Z AU - Funfas,R AU - Appoloni,C R TI - Factorial design for Fe, Cu, Zn, Se and Pb preconcentration optimization with APDC and analysis with a portable X-ray fluorescence system SN - 1873-3573 PY - 2009///1211 N1 - Publication Type: Journal Article UR - https://doi.org/10.1016/j.talanta.2007.03.004 ER -