Cadmium diagenesis in Laurentian Trough sediments

Gobeil, Charles; Silverberg, Norman; Sundby, Bjørn; Cossa, Daniel

doi:10.1016/0016-7037(87)90071-8

Cited by 144 publications

(60 citation statements)

References 18 publications

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“…The reason that the end-member of the upstream concentration varies is unclear; however, this variation is probably caused by day-to-day variation in the fl ow rate. Regarding the variation in the Cd concentration at the bay site (St. P), as Abe (2007) reported, the remineralization and release of Cd associated with organic matter from sediments (Gobeil et al 1987;Rasheed et al 2002) and atmospheric deposition from the land (Duce et al 1980;Arimoto et al 1985) could be anticipated in this study period as well. The variation in the Cd concentrations of upstream and bay water and the characteristic and amount of supplied Cd-adsorbed particles into the study sites might be infl uenced by weather conditions, such as precipitation and wind stress, which probably change each distribution pattern in Fig.…”

Section: Resultsmentioning

confidence: 60%

Behavior of dissolved cadmium in surface water of Urasoko Bay, Ishigaki Island, Japan

Abe

2008

Galaxea, Journal of Coral Reef Studies

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Section: Resultsmentioning

confidence: 60%

Behavior of dissolved cadmium in surface water of Urasoko Bay, Ishigaki Island, Japan

Abe

2008

Galaxea, Journal of Coral Reef Studies

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“…A similar conclusion has been formulated by Gendron et al (1986) in the sediments of Laurent Ian Trough, Brown et al (2000) in the sediments of Lake Malawi and Lapp et al (1993) in Baltic Sea. In addition, Pedersen et al (1986) and Gobeil et al (1987) mentioned that concentrations of Cd decreased in oxidised sediments and Nyffler et al (1984) have shown that the adsorption of Cd onto sedimentary particles under oxic conditions is low. These observations are consistent with our results, since Cd has been not found in the Fe -Mn-oxihydroxides-fraction.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of metal contamination in a changed sedimentary environment: Ghar El Melh Lagoon, Tunisia

Oueslati

Added

Abdeljaouad

2010

Chemical Speciation & Bioavailability

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Three cores were collected in the lagoon of Ghar El Melh (Northern Tunisia) and the sediments were analysed for trace and major elements, sulfides acid volatile sulfides (AVS) and pyrite and total organic carbon (TOC). The sediments are composed of black-mud in the upper layer (0 -10 cm depth) and greymud underneath. Based on the lagoon history, it was believed that the black-mud is endogenic, while the grey-mud is exogenic (derived from old contributions of the Mejerda River before its diversion). The concentrations of TOC and AVS decrease with depth, while the redox potential (Eh) is negative in the black-mud and positive in the grey-mud. The Eh measurements thus revealed the singularity of the sedimentation mode in this lagoon. The North American Composite Shale (NASC) normalisation indicated that Cd, Zn and Pb were enriched through the entire profiles, indicating that this sediment was contaminated for a long time by mining activities and human pollution. Trace metal profiles of Fe, Cd, and Cu approximated that of TOC, while the profiles of Mn, Co, Pb, Ni and Zn followed the Eh. These results, confirmed by the principal component analysis (PCA), suggested that some metals can accumulate in the reduced sediment, while others accumulate in the sub-oxic sediment. Such inference is supported by the metal chemical speciation, which showed these metal -sediment component associations: Mn, Co, Ni, Pb and Zn to the Mn-oxi-hydroxide fraction, Fe to the residual and organic -sulfide-fractions, Cu to the organic -sulfide fraction and Cd to carbonates and sulfides.

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“…Especially in a system as perturbed as San Francisco Bay, the interpretation of sediment metal profiles can be complicated by changes in the relative contribution of sediment from Ž . various sources Hornberger et al, 1999 , post-de-Ž positional redistribution of metals Gobeil et al, . 1987;Shaw et al, 1990 , and formation of insoluble Ž sulfides that enhance metal concentrations Jacobs et .…”

Section: Introductionmentioning

confidence: 99%

“…Three-fold higher Cd concentrations in sediment deposited well before significant Ž . disturbance of the estuary van Geen et al, 1999 than at the surface, for instance, are probably a diagenetic feature characteristic of mildly reducing Ž conditions Gobeil et al, 1987;van Geen et al, . 1995 .…”

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confidence: 99%

A record of estuarine water contamination from the Cd content of foraminiferal tests in San Francisco Bay, California

Geen

Luoma

1999

Marine Chemistry

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A five-year dissolved Cd time series from San Francisco Bay and adjacent coastal water shows that the composition of surface water towards the mouth of the estuary is determined largely by the effect of coastal upwelling. Cd concentrations Ž . inside and outside the estuary 0.2-1.0 nmolrkg increase as Cd-rich deep water is advected to the surface near the coast Ž . during spring and summer. On average, the mean Cd concentrations inside San Francisco Bay 0.54 nmolrkg during Ž . 1991-1995 was significantly higher than outside 0.35 nmolrkg , however. Surface samples collected throughout San Francisco Bay confirm an internal Cd source unrelated to river discharge. The Cd content of the test of a benthic foraminifer Ž . Elphidiella hannai in a dated sediment core from San Francisco Bay was measured to determine if the water column Cd enrichments in San Francisco Bay could be related to the rapid development of the watershed. The method is based on the observation that the CdrCa ratio of carefully cleaned tests of foraminifera is determined by the dissolved Cd content of overlying water at the time of test formation. Pre-industrial foraminiferal CdrCa ratios in the sediment core average Ž . Ž . 274 " 15 nmolrmol n s 19 nmolrmol. Foraminiferal CdrCa ratios increased to 386 " 33 nmolrmol n s 19 over the past several decades indicating a 40% increase in the mean Cd content of surface water in Central San Francisco Bay. We suggest that, in addition to Cd discharges into the estuary, indirect consequences of agricultural development in the Central Valley of California could have contributed to this increase. This new method to reconstruct estuarine contamination is not affected by some of the processes that complicate the interpretation of changes in bulk sediment metal concentrations. q

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Cadmium diagenesis in Laurentian Trough sediments

Cited by 144 publications

References 18 publications

Behavior of dissolved cadmium in surface water of Urasoko Bay, Ishigaki Island, Japan

Behavior of dissolved cadmium in surface water of Urasoko Bay, Ishigaki Island, Japan

Evaluation of metal contamination in a changed sedimentary environment: Ghar El Melh Lagoon, Tunisia

A record of estuarine water contamination from the Cd content of foraminiferal tests in San Francisco Bay, California

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