@article{kaipper_madureira_corseuil_2001,  title={Use of activated charcoal in a solid-phase extraction technique for analysis of pesticide residues in tomatoes},  volume={12},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532001000400012},  DOI={10.1590/S0103-50532001000400012},  number={4},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Kaipper, Beatriz I. A. and Madureira, Luiz A. S. and Corseuil, Henry X.},  year={2001},  month={Jul},  pages={514–518} }