@article{vaz_fernandes_szpoganicz_sierra_2010,  title={Potentiometric quantification and speciation of oxygenated groups in humic substances using BEST7 software},  volume={35},  ISSN={0100-4670},  url={https://doi.org/10.1590/S0100-46702010000400019},  DOI={10.1590/S0100-46702010000400019},  number={4},  journal={Eclética Química},  publisher={Fundação Editora da Universidade Estadual Paulista Júlio de Mesquita Filho - UNESP},  author={Vaz, Denise de Oliveira and Fernandes, Andreia Neves and Szpoganicz, Bruno and Sierra, Maria Marta D.},  year={2010},  pages={147–152} }