Identification of newly generated iron phases in recent anoxic sediments: 57Fe Mössbauer and microRaman spectroscopic studies

Metallic, oxygen-containing reaction products after polarisation of iron in H2S saturated saline solutions

“…An overview over Raman bands reported in the literature and their respective assignments is given in Table 2. Bands have been detected at 218 cm −1 and 280 cm −1 , in the same range as Raman bands reported in the literature for amorphous FeS in anoxic sediments [47]. The main mode described in the literature is found to be in the same frequency region as in this study [48], see also Table 2.…”

Control by fiddler crabs (Uca vocans) and plant roots (Avicennia marina) on carbon, iron, and sulfur biogeochemistry in mangrove sediment

“…Since CRS is not extracted by this procedure, most of the extracted Fe(II) must be nonsulfur-bound (Thamdrup 2000). The speciation of this non-S-Fe(II) is generally not known, but potential candidates include Fe(II) containing sheet silicates, mixed Fe(II)/Fe(III) hydroxides, adsorbed Fe(II), and phosphate or mixed carbonate Fe(II) precipitates (Aller et al 1986;Boughriet et al 1997;Haese et al 1997).…”

Synthesis of iron sulfide films through solid–gas reaction of iron with diethyl disulfide

“…[26] The signals at 250, 388 and 523 cm −1 can be related to lepidocrocite, γ -FeOOH, generated through oxidation of FeS content in the film. [27,28] The signal at 322 cm −1 may be attributed to partial oxidation of iron inside the crystal structure of FeS. [24,28] Note that the operating conditions during the microbalance experiments exclude the possibility of having oxygen at the beginning and during each tests and hydrogen treatments remove any initial oxide layer present on the iron foils.…”

“…[27,28] The signal at 322 cm −1 may be attributed to partial oxidation of iron inside the crystal structure of FeS. [24,28] Note that the operating conditions during the microbalance experiments exclude the possibility of having oxygen at the beginning and during each tests and hydrogen treatments remove any initial oxide layer present on the iron foils. It has been reported that exposing pyrite and pyrrothyte to air at room temperature results in the formation of iron oxyhydroxides species.…”