Abstract
A spectrophometric study of the speciation of the chemical forms Cr+3, CrO4-2and Cr2O7-2was carried out on a wide interval of pH (from 2,0 to 12,0) in a Britton-Robinson buffer solution. The absorption spectra of the ultraviolet and visible regions are well defined and show bands in the two spectral regions. The relation between absorbance versus concentration for each chemical species allowed us to know the molar absorption coefficients of the chemical entities.
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De Sá Costa, L., Da Silva Pereira, F. R., De Farias, R. F., & Pereira, F. C. (2010). AvaliaÇÃo espectrofotomÉtrica das formas CR+3, CRO4-2E CR2O7-2. Ecletica Quimica, 35(3), 157–167. https://doi.org/10.26850/1678-4618EQJ.V35.3.2010.P157-167
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