@article{chaves_tit_2011,  title={Cadmium and copper adsorption on bentonite: effects of pH and particle size},  volume={42},  ISSN={1806-6690},  url={https://doi.org/10.1590/S1806-66902011000200004},  DOI={10.1590/S1806-66902011000200004},  number={2},  journal={Revista Ciência Agronômica},  publisher={Universidade Federal do Ceará},  author={Chaves, Lúcia Helena Garófalo and Tit, Gilvanise Alves},  year={2011},  month={Apr},  pages={278–284} }