Reduction of Ag{sup I}, Au{sup III}, Cu{sup II}, and Hg{sup II} by Fe{sup II}/Fe{sup III} hydroxysulfate green rust.

Journal Article · Sat Nov 01 00:00:00 EST 2003 · Chemosphere

DOI:https://doi.org/10.1016/S0045-6535(03)00545-9· OSTI ID:961200

O'Loughlin, E J; Kelly, S D; Kemner, K M; Csencsits, R; Cook, R E

Green rusts are mixed Fe{sup II}/Fe{sup III} hydroxides that are found in many suboxic environments where they are believed to play a central role in the biogeochemical cycling of iron. X-ray absorption fine structure analysis of hydroxysulfate green rust suspensions spiked with aqueous solutions of AgCH{sub 3}COO, AuCl{sub n}(OH){sub 4-n}, CuCl{sub 2}, or HgCl{sub 2} showed that Ag{sup I}, Au{sup III}, Cu{sup II}, and Hg{sup II} were readily reduced to Ag{sup 0}, Au{sup 0}, Cu{sup 0}, and Hg{sup 0}. Imaging of the resulting solids from the Ag{sup I}-, Au{sup III}-, and Cu{sup II}-amended green rust suspensions by transmission electron microscopy indicated the formation of submicron-sized particles of Ag{sup 0}, Au{sup 0}, and Cu{sup 0}. The facile reduction of Ag{sup I}, Au{sup III}, Cu{sup II}, and Hg{sup II} to Ag{sup 0}, Au{sup 0}, Cu{sup 0}, and Hg{sup 0}, respectively, by green rust suggests that the presence of green rusts in suboxic soils and sediments can have a significant impact on the biogeochemistry of silver, gold, copper, and mercury, particularly with respect to their mobility.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC02-06CH11357
• OSTI ID: 961200
• Report Number(s): ANL/ER/JA-45381; CMSHAF; TRN: US201010%%1018
• Journal Information: Chemosphere, Vol. 53, Issue 5 ; Nov. 2003; ISSN 0045-6535
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

54 ENVIRONMENTAL SCIENCES
ABSORPTION
AQUEOUS SOLUTIONS
BIOGEOCHEMISTRY
COPPER
COPPER COMPLEXES
CORROSION
FINE STRUCTURE
GOLD
GOLD COMPLEXES
HYDROXIDES
IRON
IRON COMPLEXES
IRON HYDROXIDES
MERCURY
MOBILITY
PARTICLES
REDUCTION
SEDIMENTS
SILVER
SILVER COMPLEXES
SOILS
SOLIDS
SUSPENSIONS
TRANSMISSION ELECTRON MICROSCOPY