introduction: minerals are one of the main components of soils which play different roles in the soils. minerals make up about 50% of the volume of most soils. they provide physical support for plants, and create the water- and air-filled pores that make plant growth possible. mineral weathering releases plant nutrients which are retained by other minerals through adsorption, cation exchange, a...

This work aims to contribute the interpretation of soil colors; mainly identify pigments that generate greenish colors in hydromorphic conditions (gley colors) vertisols coastal plain Río de la Plata estuary. These are cold hues, generally (olive-gray), and occur poorly drained soils with prolonged water accumulation. For this purpose, samples Bssg horizons from estuary were analyzed using rout...

We present experimental observations and a conceptual model for understanding the compression swelling characteristics of Old Alluvium (OA) from San Juan, Puerto Rico. Prior studies have classified OA as transported, in situ weathered tropical soil whose intact macrostructure comprises cemented, pseudo-silt with mixture quartz grains aggregated clay particles. The aggregates include mixtures ka...

Widely available natural layered expandable clay minerals (smectites) can sorb carbon dioxide in their interlayer space under specific conditions and hence may show potential for gas separation or sequestration processes. This work presents experimental adsorption desorption measurements of gaseous, sub-critical (p = 0.1 bar up to 20 bar, T ?20 °C 300 °C) on well-characterized anhydrous smectit...

FTIR and Infrared emission spectroscopy (IES) has been used to characterise the Uley (Australian) and Garfield nontronites. These clay minerals are characterised by a strong emission band at 3570 cm(-1) attributed to the FeFeOH unit. Dehydroxylation is followed by the loss of intensity of this band as a function of temperature. Dehydroxylation is also followed by the loss of intensity of the Fe...

The interaction of sulfonamide antimicrobial agents with smectite clay minerals and humic acid (HA)-clay complexes was investigated in batch experiments to assess the influence of adsorbed humic acid on sulfonamide sorption. Soil HA-clay complexes were produced at HA:clay ratios of 1:5, 1:50, and 1:100 (w/w). Vibrational and electronic spectroscopy indicated the preferential adsorption of polar...

[1] Mawrth Vallis contains one of the largest exposures of phyllosilicates on Mars. Nontronite, montmorillonite, kaolinite, and hydrated silica have been identified throughout the region using data from the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM). In addition, saponite has been identified in one observation within a crater. These individual minerals are identified and disti...