Natural enrichment of arsenic in Loch Lomond sediments

Farmer, John G.; Lovell, M. A.

doi:10.1016/0016-7037(86)90259-0

Cited by 83 publications

(26 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Arsenic substitution into early diagenetic pyrite and acid-volatile sulfide (AVS) is commonly proposed as a mechanism to account for removal of dissolved arsenic from pore water in marine and fresh water sediment (Farmer and Lovell, 1986;Huerta-Diaz and Morse, 1992;Sullivan and Aller, 1996;Hideki and Yoshihisa, 1997;Saunders et al, 1997;Huerta-Diaz et al, 1998;Pirrie et al, 1999;Mucci et al, 2000;Sternbeck et al, 2000;O'Day et al, 2004;Saunders et al, 2005b;Southam and Saunders, 2005;Wilkin and Ford, 2006). Arsenic assimilation into forming sulfides commonly occurs as sediment is buried below the suboxic and sulfidic redox boundary.…”

Section: Introductionmentioning

confidence: 99%

Arsenic incorporation into authigenic pyrite, Bengal Basin sediment, Bangladesh

Lowers

Breit

Foster

et al. 2007

Geochimica et Cosmochimica Acta

236

113

View full text Add to dashboard Cite

Sediment from two deep boreholes ($400 m) approximately 90 km apart in southern Bangladesh was analyzed by X-ray absorption spectroscopy (XAS), total chemical analyses, chemical extractions, and electron probe microanalysis to establish the importance of authigenic pyrite as a sink for arsenic in the Bengal Basin. Authigenic framboidal and massive pyrite (median values 1500 and 3200 ppm As, respectively), is the principal arsenic residence in sediment from both boreholes. Although pyrite is dominant, ferric oxyhydroxides and secondary iron phases contain a large fraction of the sediment-bound arsenic between approximately 20 and 100 m, which is the depth range of wells containing the greatest amount of dissolved arsenic. The lack of pyrite in this interval is attributed to rapid sediment deposition and a low sulfur flux from riverine and atmospheric sources. The ability of deeper aquifers (>150 m) to produce ground water with low dissolved arsenic in southern Bangladesh reflects adequate sulfur supplies and sufficient time to redistribute the arsenic into pyrite during diagenesis. Published by Elsevier Ltd.

show abstract

Section: Introductionmentioning

confidence: 99%

Arsenic incorporation into authigenic pyrite, Bengal Basin sediment, Bangladesh

Lowers

Breit

Foster

et al. 2007

Geochimica et Cosmochimica Acta

236

113

View full text Add to dashboard Cite

show abstract

“…Porewater arsenic rapidly declined above and below the 5-11 cm zone where maximum concentrations (76-103 /g 1-1) were recorded. Both solid phase and porewater arsenic profiles (as found also for core LL-ILA in Farmer & Lovell (1986)) are consistent with arsenic release into solution from an association with solid phase ferric oxyhydroxides, which dissolve under sufficiently reducing conditions, followed by upward migration, oxidation and co-precipitation or readsorption on iron oxyhydroxides in the aerobic layers of sediment. Figure 8 shows that As(III) is the predominant species in the reduction zone and, with the exception of the uppermost section, even in the oxidised zone, due to preferential adsorption of As(V) on iron oxyhydroxides.…”

Section: Sediment Diagenesis and Element Mobilitymentioning

confidence: 52%

“…2. Loch Lomond, showing main inflows, from the north and south-east, and outflow, to the south, and the 13 sediment core collection sites of Farmer & Lovell (1984, 1986 (1-6, southern basin; 7-9, central basin; 10-13, northern basin), designated LL-(1-13)L in Table 1. Of the other five cores listed in Table 1.…”

Section: Loch Lomond Sedimentation Rates and Man's Activitiesmentioning

confidence: 99%

“…This hypothesis was tested on a loch-wide basis in the detailed 13-core study (LL-(1-13)L, Table 1, Fig. 2) of Farmer & Lovell (1986). Concentrations of arsenic in surface or near-surface sediment in 12 of the 13 cores from the three major basins were indeed substantially enhanced, up to 675 mg kg -l compared with background values of 15-50 mg kg-' (Fig.…”

Section: Sediment Diagenesis and Element Mobilitymentioning

confidence: 99%

“…2). The longer cores (LLRDI, LLMA) exhibit evidence of the Flandrian marine transgression which made Loch Lomond a sea loch for a substantial period (Dickson et al, 1978;Mackenzie et al, 1983Mackenzie et al, , 1990, while the shorter cores (LLRPMI, LL-(1-13)L, LL-IJ) provide evidence of environmental pollution during the industrial era (Farmer et al, 1980;Lovell, 1985;Farmer & Lovell, 1986;Sugden et al, 1991 ) and of the perturbatory effects of recent sediment diagenesis (Farmer & Cross, 1979;Farmer& Lovell, 1984, 1986Johnson & Farmer, 1987). Information on sedimentation rates is provided by long (LLRDI - Dickson et al, 1978) and…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Environmental change and the chemical record in Loch Lomond sediments

Farmer

1994

Hydrobiologia

View full text Add to dashboard Cite

The chemical record in Loch Lomond sediments deposited since the end of the last Ice Age provides evidence of the Flandrian marine transgression some 5500-7000 1 4 C years B.P., sedimentation rates and the influence of man's local activities, environmental pollution and its sources since the onset of the Industrial Revolution, and of elemental mobility linked with the reduction-diffusion-oxidation cycle of early sedimentary diagenesis. Information derived from vertical profiles of halogen elements bromine and iodine, radionuclides 14C and 210 Pb, heavy metals lead, zinc, and cadmium, stable lead isotopes 206 b and 207 Pb, and redox-sensitive elements manganese, iron and arsenic is reviewed and assessed.

show abstract

Emergence of order in small autocatalytic sets maintained far from equilibrium: Application of a probabilistic receptor affinity distribution (RAD) model

Lancet

Kedem

Pilpel

1994

Ber Bunsenges Phys Chem

View full text Add to dashboard Cite

We examined the behavior of auto-catalytic sets of polymers by a computer simulation. Polymers are allowed to interact with each other, whereby each polymer molecule may catalyze the formation and degradation of others. The system is subjected to a set of thermodynamic and kinetic constraints, including a constant influx of free energy, which keeps the system away from chemical equilibrium and thus enables the effect of catalysis. The system is found to continuously change and probe many possible values in the composition space. In this simulation we make use of a Receptor Affinity Distribution (RAD) model to predict the probabilities of interaction and catalysis. Our results indicate that initially random sets of polymers, under the assumptions of the model, might accumulate information (ie., clustering in the composition space). Sets will occupy a limited region of composition space, and temporarily reproduce themselves or disperse and give rise to other sets.

show abstract

Natural enrichment of arsenic in Loch Lomond sediments

Cited by 83 publications

References 32 publications

Arsenic incorporation into authigenic pyrite, Bengal Basin sediment, Bangladesh

Arsenic incorporation into authigenic pyrite, Bengal Basin sediment, Bangladesh

Environmental change and the chemical record in Loch Lomond sediments

Emergence of order in small autocatalytic sets maintained far from equilibrium: Application of a probabilistic receptor affinity distribution (RAD) model

Contact Info

Product

Resources

About