Abstract Goethite/hematite ratios in soils are widely used to reconstruct past climatic changes, but their accurate measurements have remained challenging due the matrix effect. Here we present a new method for measuring soil goethite/hematite by characterizing band position of electron pair transition (EPT) based on diffuse reflectance spectra processed continuum removal. We introduce “half‐ba...

While interflow from the slopes can be crucial for water and nutrient availability in low-input farming systems wetlands East Africa, very little data exist on hillslope hydrology associated transport deeply weathered saprolites over crystalline rocks. This study aims a better process understanding of generation routing this environment its contribution to nitrate at wetland fringe valley botto...

Larry D. McKay, Steven G. Driese, Kevin H. Smith, and Michael J. Vepraskas Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN 37996-1410, U.S.A. Department of Soil Science, North Carolina State University, Raleigh, NC, 27695-7619 U.S.A. ___________________________________________________________________________ ___ *Corresponding author. Tel.: +1-865-974-0821; Fa...

controlled by capillarity, any attempt to predict DNAPL behavior in a porous medium requires determination of Dense nonaqueous phase liquids (DNAPLs) are important subsurthe capillary pressure–saturation relationship, hereafter face contaminants. Information is lacking on DNAPL behavior in heterogeneous porous media such as weathered rock (saprolite). We denoted by w(hc), where w is the volumet...

The role of solution chemistry (cation charge and concentration) and particle size on colloid transport was examined in an intact monolith of fractured shale saprolite (highly weathered rock). Recovery of the microsphere tracers consistently decreased with increasing ionic strength of either mono- (Na+) or divalent- (Ca2+) dominated solutions, but a much greater concentration of Na+ in the infl...