@article{bolzan_moraes_mattos_dressler_flores_2010,  title={Arsenic determination in pharmaceutical grade barium sulfate using direct solid sampling electrothermal atomic absorption spectrometry},  volume={21},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532010000400015},  DOI={10.1590/S0103-50532010000400015},  number={4},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Bolzan, Rodrigo C. and Moraes, Diogo P. de and Mattos, Julio Cezar P. de and Dressler, Valderi L. and Flores, Érico M. de Moraes},  year={2010},  pages={686–693} }