The reaction of FeS2 (pyrite) with gaseous H2O, O2, and H2O/O2 was investigated using horizontal attenuated total reflection Fourier transform infrared spectroscopy (HATR-FTIR). Spectra were interpreted with the aid of hybrid molecular orbital/density functional theory calculations of sulfate-iron hydroxide clusters. Reaction of pyrite in gaseous H2O led primarily to the formation of iron hydro...

Pyrite as a proxy for the redox states of bottom waters was evaluated in the context of modern salt marsh sediments. Two sites, 40m apart, with very different physicochemical properties were sampled seasonally. The sites differed from each other in (1) the amount of tidal flushing, (2) vegetation, (3) redox condition below the sediment–water interface, (4) carbon content and (5) solid phase iro...

Long-distance electron transfer in marine environments couples physically separated redox half-reactions, impacting biogeochemical cycles of iron, sulfur and carbon. Bacterial bio-electrochemical systems that facilitate electron transfer via conductive filaments or across man-made electrodes are well-known, but the impact of abiotic currents across naturally occurring conductive and semiconduct...

Surface colonization and microbial dissolution of pyrite were studied in the laboratory and by in situ surface colonization experiments conducted at Iron Mountain, California. Laboratory experiments involved organisms obtained from Iron Mountain and cultured in pH ,1.0, 42 8C solutions designed to enrich for chemolithotrophic species present at acidgenerating sites. Planktonic and sessile micro...

Problem statement: For a number of geological reasons a proportion of the present coastal plains in the Malay Peninsula were inundated by seawater in the past when pyrite in some of the soils is believed to have been mineralized. Random survey of these sites showed a unique distribution and depth of pyritic layer in the soils along the coastal plains. A study was conducted in order to explain t...

background & aim: in order study the effect of thiobacillus, sulphur and organic materials on vegetative growth and essence production in lemon balm (melissa officinalis l.) was conducted in pots in field condition at shahrekord, iran on 2008. experimental: the factors were ten soil treatments inclusive 200 kg/ha sulphur, 400 kg/ha sulphur, 600 kg/ha sulphur, 200 kg/ha sulphur + thiobacill...

Sulphur Mustard is a potent chemical warfare agent that was widely used during first world war and Iran ‌Iraq conflict. Over 100,000 Iranians were injured by sulphur mustard and one-third is of them were suffering from late effects until today. This vesicant agent has a lot of acute and chronic destructive effects on the skin, eye and respiratory system. Sulphur mustard via the alkylations of s...

This paper describes some biodegradation processes originating from the activity of microorganisms in the black crusts of historic buildings. The crusts are mainly composed of gypsum, carbonaceous particles, and polycyclic aromatic hydrocarbons. The slowly dissolving gypsum from black crusts represents a continuous source of sulphur for microbial growth. The sulphate-bonding capacity of the she...