@article{rocha_batista_melchert_zagatto_2018,  title={Solid-phase extractions in flow analysis},  volume={90},  ISSN={0001-3765},  url={https://doi.org/10.1590/0001-3765201820170513},  DOI={10.1590/0001-3765201820170513},  number={1},  journal={Anais da Academia Brasileira de Ciências},  publisher={Academia Brasileira de Ciências},  author={ROCHA, FÁBIO R.P. and BATISTA, ALEX D. and MELCHERT, WANESSA R. and ZAGATTO, ELIAS A.G.},  year={2018},  pages={803–824} }