1. ABNT (1989). ABNT - Associação Brasileira de Normas Técnicas [Brazilian Association of Technical Standards]. NBR 10738:1989 - Água - Determinação de surfactantes aniônicos pelo método espectrofotométrico do azul-de-metileno - Método de ensaio [Determination of anionic surfactants by the methylene blue spectrophotometric method - Test method].
2. Al Aukidy, M., Verlicchi, P., & Voulvoulis, N. (2014). A framework for the assessment of the environmental risk posed by pharmaceuticals originating from hospital effluents. Science of the Total Environment, 493, 54–64. https://doi.org/10.1016/j.scitotenv.2014.05.128
3. APHA. (2012). Standard methods for the examination of water and wastewater. 22 ed. Washington: American Public Health Association.
4. Baird, R., Bridgewater, L. (2018). 5540 SURFACTANTS. In: Standard methods for the examination of water and wastewater, 23rd edn. American Public Health Association, Washington, D.C
5. Bergé, A., Wiest, L., Baudot, R., et al. (2018). Occurrence of multi-class surfactants in urban wastewater: Contribution of a healthcare facility to the pollution transported into the sewerage system. Environmental Science and Pollution Research, 25, 9219–9229. https://doi.org/10.1007/s11356-017-0470-8