@article{saab_carvalho_bernardes filho_moura_martin-neto_mattoso_2010,  title={pH effect in aquatic fulvic acid from a Brazilian river},  volume={21},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532010000800012},  DOI={10.1590/S0103-50532010000800012},  number={8},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Saab, Sérgio da Costa and Carvalho, Eduarda R. and Bernardes Filho, Rubens and Moura, Márcia R. de and Martin-Neto, Ladislau and Mattoso, Luiz Henrique C.},  year={2010},  pages={1490–1496} }