@article{pessoa_lyra_castro_campos_carneiro_brandão_2012,  title={Comparison of different pre-treatment procedures for the determination of chromium in crude oil samples by GF AAS},  volume={23},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532012005000004},  DOI={10.1590/S0103-50532012005000004},  number={8},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Pessoa, Helen M. and Lyra, Fernanda H. and Castro, Eustáquio Vinicius R. de and Campos, Reinaldo C. de and Carneiro, Maria Tereza W. D. and Brandão, Geisamanda P.},  year={2012},  month={Aug},  pages={1421–1428} }