Arsenic and mercury concentrations in major landscape components of an intensively cultivated watershed

Cooper, Charles M.; Gillespie, William B.

doi:10.1016/s0269-7491(00)00029-4

Cited by 40 publications

(18 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Terrestrial soils are possibly the most significant contributor of mercury to surface water Cooper & Gillespie 2001;Grigal 2002). Past work even suggests a significant amount of methyl-mercury in surface water originates from the terrestrial watershed (Bishop et al 1991;Lee & Iverfelt 1991;Hultberg et al 1994;Hurley et al 1995;Rudd 1995;St.…”

Section: Introductionmentioning

confidence: 99%

Principal Biogeochemical Factors Affecting the Speciation And Transport of Mercury through the terrestrial environment

Gabriel

Williamson

2004

Environ Geochem Health

239

133

View full text Add to dashboard Cite

It is increasingly becoming known that mercury transport and speciation in the terrestrial environment play major roles in methyl-mercury bioaccumulation potential in surface water. This review discusses the principal biogeochemical reactions affecting the transport and speciation of mercury in the terrestrial watershed. The issues presented are mercury-ligand formation, mercury adsorption/desorption, and elemental mercury reduction and volatilization. In terrestrial environments, OH-, Cl- and S- ions have the largest influence on ligand formation. Under oxidized surface soil conditions Hg(OH)2, HgCl2, HgOH+, HgS, and Hg0 are the predominant inorganic mercury forms. In reduced environments, common mercury forms are HgSH+, HgOHSH, and HgClSH. Many of these mercury forms are further bound to organic and inorganic ligands. Mercury adsorption to mineral and organic surfaces is mainly dictated by two factors: pH and dissolved ions. An increase in Cl- concentration and a decrease in pH can, together or separately, decrease mercury adsorption. Clay and organic soils have the highest capability of adsorbing mercury. Important parameters that increase abiotic inorganic mercury reduction are availability of electron donors, low redox potential, and sunlight intensity. Primary factors that increase volatilization are soil permeability and temperature. A decrease in mercury adsorption and an increase in soil moisture will also increase volatilization. The effect of climate on biogeochemical reactions in the terrestrial watershed indicates mercury speciation and transport to receiving water will vary on a regional basis.

show abstract

Section: Introductionmentioning

confidence: 99%

Principal Biogeochemical Factors Affecting the Speciation And Transport of Mercury through the terrestrial environment

Gabriel

Williamson

2004

Environ Geochem Health

239

133

View full text Add to dashboard Cite

show abstract

“…Analysis of variance (ANOVA) of trace metal concentrations in the surface and the bottom layers for the 13 sampling sites was carried out using one way ANOVA model which relies on an additive decomposition of the data into grand mean, main effects, possible interactions, and an error term (Gelman, 2005). This analysis tests the validity of the 'null' hypothesis that pH and the trace metal concentrations did not differ with (i) depth, (ii) location and (iii) time (Cooper & Gillespie, 2001). The differences are considered significant if F-ratio >> 1.0 and the p-value << 1.0, when the null hypothesis is invalid and the measured values within a group have valid correlation.…”

Section: Discussionmentioning

confidence: 99%

“…Although the use of As-based insecticides has declined or stopped, its occurrence in the receiving waters continues even after a very long time. The use of As compounds as desiccants, fungicides for grapes (Vitis vinifera), and active ingredients in selective herbicides, has continued (Cooper & Gillespie, 2001). It is therefore not surprising that the presence of this toxic metal is still detected in Deepor Beel water…”

Section: Arsenicmentioning

confidence: 99%

See 1 more Smart Citation

Spatial, Temporal and Depth Profiles of Trace Metals in an Urban Wetland System: A Case Study with Respect to the Deepor Beel, Ramsar Site 1207, India

Kapil¹,

Bhattacharyya²

2012

View full text Add to dashboard Cite

The Deepor Beel is a permanent, freshwater wetland at the southwest corner of Guwahati (India) and it is a major stormwater storage basin for the city. Beel was designated as a Ramsar site (No. 1207) in 2002 and recognized as an important habitat for a large number of migratory aquatic birds. Orchids of commercial value are also found in the forests on the bank. The Deepor Beel is presently under stress due to excessive fishing activities, hunting of water fowl, input of contaminants from the agricultural fields and industries in the surroundings and infestation by water hyacinth. This study reports on monitoring of pH and 10 trace metals (As, Cd, Cr, Co, Cu, Ni, Mn, Pb, Hg, Zn) in the Deepor Beel water at 13 sites for three different depths consisting of surface layer, middle layer or euphotic zone, and bottom layer or euphotic zone x 1.5. The assessment was done bimonthly for a year.

show abstract

“…The health risks associated with the ingestion of contaminated fish are about 20 to 40 times higher than contaminated water ingestion (Foran 1990). This is due to the fact that aquatic organisms are capable to concentrate the trace elements in up to 105 times the concentration observed in the environment (Hylander et al 2000;Cooper and Gillespie 2001). It is already known that Hg concentration in an organism cannot be considered as a constant value, but as a subjected factor for the influences of the biotic variations as well as abiotic influences (Förstner 1987).…”

Section: Introductionmentioning

confidence: 99%

Mercury concentration in fish from Piracicaba River (Minas Gerais, Brazil)

Arantes¹,

Pinto²,

Mangabeira³

et al. 2008

Environ Monit Assess

View full text Add to dashboard Cite

Mercury emissions from some upstream gold mining areas and recent findings of high natural Hg levels in sediments motivated studies on the Hg cycle in the Minas Gerais state. The study presents the total mercury amount found in Geophagus brasiliensis' muscular tissue (wet weight) and sediments from Piracicaba River. Mercury was analyzed using acid digestion followed by determination of total mercury by cold vapour atomic absorption spectrophotometry. This study was also complemented with the analysis of the limnological parameters (water temperature, conductivity, total dissolved solids, suspended particles, pH, dissolved oxygen, maximum depth, photic index and total carbon). The mercury concentration in sediments samples was higher than the mercury concentration in muscular tissue of fish. The lowest Hg level measured in fish was 0.0147 microg g( - 1), while the highest was 0.101 microg g( - 1). In the sediment samples, the lowest and highest levels were 0.02 microg g( - 1) and 0.16 microg g( - 1), respectively. The Hg concentrations in fish and sediment were both under the maximum limit permitted by the World Health Organization.

show abstract

Arsenic and mercury concentrations in major landscape components of an intensively cultivated watershed

Cited by 40 publications

References 5 publications

Principal Biogeochemical Factors Affecting the Speciation And Transport of Mercury through the terrestrial environment

Principal Biogeochemical Factors Affecting the Speciation And Transport of Mercury through the terrestrial environment

Spatial, Temporal and Depth Profiles of Trace Metals in an Urban Wetland System: A Case Study with Respect to the Deepor Beel, Ramsar Site 1207, India

Mercury concentration in fish from Piracicaba River (Minas Gerais, Brazil)

Contact Info

Product

Resources

About