Feasibility of using solid sampling graphite furnace atomic absorption spectrometry for preparation of spiked filter papers with Cu and Zn as standards for direct solid analysis - Nomura, Cassiana Seimi; Intima, Danielle Polidorio; Oliveira, Pedro Vitoriano de; Ruffini, Iolanda A.; Krug, Francisco José (Analytical and Bioanalytical Chemistry, 2008)