Thermodynamic, spectroscopic and magnetic studies on anoxic sediments from the Seine river estuary

Ouddane, Baghdad; Cordier, Carole; Laureyns, J.

doi:10.1039/a805988h

Cited by 7 publications

(1 citation statement)

References 8 publications

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“…Micro-Raman spectroscopy has proved to be a valuable technique for the identiÐcation of sedimentary components and their morphological aspects in sedimentary materials. 45 In this work, the combined use of an optical microscope with a Raman spectrometer has allowed us to visually select analytical areas where interesting mineral specimens are present, and subsequently to perform both morphological and chemical analyses on randomly chosen specimens. This technique was applied to particles recovered after the chemical extraction step employing HF, and subsequently after the chemical extraction with concentrated Note that these particles HNO 3…”

Section: Micro-raman Spectroscopic Studiesmentioning

confidence: 99%

Chemistry of metal sulfides in anoxic sediments

Billon

Ouddane

Laureyns

et al. 2001

Phys. Chem. Chem. Phys.

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Using sequential extraction of solid sulfides, the determination of acid volatile sulfides (AVS) and chromium reducible sulfurs (CRS) in anoxic sediments from the Authie Bay (in northern France) has been undertaken because of the importance of the sediments as sinks for iron, sulfur and trace metals and as possible sources of pollution when reduced sediments are mixed with oxic waters (as a result of a sediment remobilization induced by physical disturbances such as tidal currents and dredgings), and subsequently oxidized. Chemical analysis of solutions recovered after sequential leaching of sediments with 1 M HCl, 1 M HF and concentrated HNO3 has enabled us to obtain profiles, s. sediment depth, of trace metals associated with pyrite. Porewater concentration profiles s. depth have been determined for several cations (Ca2+, Cd2+, Cu2+, Fe2+, Mg2+, Mn2+, Na+, Pb2+, Sr2+ and Zn2+) and anions (CO32–, PO43–, SO42– and S2–). Using the chemical equilibrium modeling program MINEQL+ with these analytical data, thermodynamic calculations have given information about the possibility of precipitation of discrete metal sulfide phases (FeS as greigite and amorphous FeS; ZnS, PbS, CuS and CdS), and coprecipitation with adsorption on solid FeS to produce solid solutions with iron sulfides. The degree of trace metal pyritization, DTMP, has been determined for these metals and compared to the degree of pyritization, DOP. The findings suggest that in Authie-bay sediments Mn is well pyritized; whereas Zn, Cu, Ni and above all Cd are weakly pyritized (MnZnCu>NiCd). These observations seem to be intimately related to the existence of the discrete/separate solid phases CuS, CdS and ZnS, as predicted by thermodynamic calculations. Finally, analysis of crude sediments, heavy minerals and pyrite extracted by a heavy liquid density separation method, has been performed with a Raman microprobe to gain information about the geochemical and mineralogical characteristics of these sediments. The efficiency of sequential leachings of sediments (which were used for sedimentary pyrite recovery/attack and analysis of pyritic Fe and trace metal) has also been evaluated by these techniques

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Section: Micro-raman Spectroscopic Studiesmentioning

confidence: 99%

Chemistry of metal sulfides in anoxic sediments

Billon

Ouddane

Laureyns

et al. 2001

Phys. Chem. Chem. Phys.

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Deposition of copper‐doped iron sulfide (Cu_xFe_1−xS) thin films using aerosol‐assisted chemical vapor deposition technique

Disale

Garje

2010

Applied Organom Chemis

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Copper-doped iron sulfide (Cu x Fe 1−x S, x = 0.010-0.180) thin films were deposited using a single-source precursor, Cu(LH) 2 Cl 2 (LH = monoacetylferrocene thiosemicarbazone), by aerosol-assisted chemical vapor deposition technique. The Cu-doped FeS thin films were deposited at different substrate temperatures, i.e. 250, 300, 350, 400 and 450• C. The deposited thin films were characterized by X-ray diffraction (XRD) patterns, Raman spectra, scanning electron microscopy, energy dispersive X-ray analysis (EDX) and atomic force microscopy. XRD studies of Cu-doped FeS thin films at all the temperatures revealed formation of single-phase FeS structure. With increasing substrate temperature from 250 to 450• C, there was change in morphology from wafer-like to cylindrical plate-like. EDX analysis showed that the doping percentage of copper increased as the substrate temperature increased from 250 to 450

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S-doped α-Fe2O3 as a highly active heterogeneous Fenton-like catalyst towards the degradation of acid orange 7 and phenol

Guo

Chen

Fan

et al. 2010

Applied Catalysis B: Environmental

290

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Thermodynamic, spectroscopic and magnetic studies on anoxic sediments from the Seine river estuary

Cited by 7 publications

References 8 publications

Chemistry of metal sulfides in anoxic sediments

Chemistry of metal sulfides in anoxic sediments

Deposition of copper‐doped iron sulfide (Cu_xFe_1−xS) thin films using aerosol‐assisted chemical vapor deposition technique

S-doped α-Fe2O3 as a highly active heterogeneous Fenton-like catalyst towards the degradation of acid orange 7 and phenol

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Thermodynamic, spectroscopic and magnetic studies on anoxic sediments from the Seine river estuary

Cited by 7 publications

References 8 publications

Chemistry of metal sulfides in anoxic sediments

Chemistry of metal sulfides in anoxic sediments

Deposition of copper‐doped iron sulfide (CuxFe1−xS) thin films using aerosol‐assisted chemical vapor deposition technique

S-doped α-Fe2O3 as a highly active heterogeneous Fenton-like catalyst towards the degradation of acid orange 7 and phenol

Contact Info

Product

Resources

About

Deposition of copper‐doped iron sulfide (Cu_xFe_1−xS) thin films using aerosol‐assisted chemical vapor deposition technique