Reboucas, M.V. et al. 2006. Analysis of effluent from caustic treatment plants: Improvement of accuracy in the simultaneous potentiometric determination of sulfide and mercaptide ions. CT&F - Ciencia, Tecnología y Futuro. 3, 2 (Dec. 2006), 163–170. DOI:https://doi.org/10.29047/01225383.499.