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- W177327416 abstract "Color changes in nontronite suspensions due to chemical reduction of structural Fe3+ were measured by visible spectroscopy. The most prominent change in the visible spectrum as Fe2+ increases is the appearance of a broad absorbance bad with a maximum initially at 760 nm. Continued reduction of the clay enhances the intensity of this band, and the peak maximum shifts to 725 nm when Fe2+ concentrations exceed 60 mmoles/100 g clay. Multiple linear regression analysis of absorbance at 760 nm versus structural Fe2+ content revealed two different linear regions of the curve. The inflexion point separating these linear segments of the curve was located at a Fe2+ concentration of 53 mmoles/100 g clay. Correlation coefficients for the upper and lower segments were 0.97 and 0.98, respectively. A possible explanation for the multiple linear segments of the visible absorbance versus Fe2+ plot is that the coordination environment surrounding octahedral iron becomes altered significantly when the Fe2+ concentration in the clay mineral reaches the vicinity of the inflexion point. This explanation is consistent with previously published information dealing with redox mechanisms for structural iron in dioctahedral smectites." @default.
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- W177327416 date "1979-01-01" @default.
- W177327416 modified "2023-10-18" @default.
- W177327416 title "Effect of Structural FE2+ on Visible Absorption Spectra of Nontronite Suspensions" @default.
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- W177327416 doi "https://doi.org/10.1016/s0070-4571(08)70703-9" @default.
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