Iron‐oxo‐hydroxides and their significance to the behaviour of heavy metals in estuaries

Schoer, Jürgen

doi:10.1080/09593338509384336

Cited by 28 publications

(11 citation statements)

References 17 publications

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“…The geochemical properties include, in the order of decreasing importance, Cs, Fe, Co, Rb and a small contribution for Sc, Ta and Li. Metals of this factor are related to the composition of fine-grained and clay-mineral-rich sediments because of the high correlation with kaolinite, chlorite and illite, similar to that with total Si, A1 and Fe, in accordance with the findings of Schoer (1985). The high correlation between Co-Hg (r --0.760), Co-W (r --0.838) and Co-Zn (r --0.730) is reflected in its contribution to factors 2 and 6 ( Table 3).…”

Section: Resultssupporting

confidence: 69%

Trace elements levels in sediments of the Czech part of the Elbe river

Borovec

1996

GeoJournal

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A study was carried out of the accumulation of 45 elements in the fine-grained fraction (< 63 p,m) of the surface stream sediments of the Elbe (Labe) River. The metal contents in the sediments, compared to the geochemical background concentrations, were highest for Ag, Cd, Cu, Hg, Zn, Pb and As. Statistical factor analysis was employed to identify seven types of components in sediments with different sedimentological and.geochemical character. The eigenvalues of the first seven factors explained 85% of the total variance. Most of the contaminants in the bottom sediments appear to be bonded to hydrated Fe and Mn oxides and to particulate loading. Possible pollution sources were found by cluster analysis.

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Section: Resultssupporting

confidence: 69%

Trace elements levels in sediments of the Czech part of the Elbe river

Borovec

1996

GeoJournal

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“…Principal component Analysis (PCA) is used to understand the correlation structure of collected data and identify the most important factors contributing to the data structure (Schoer, 1985  2011, ALÖKI Kft., Budapest, Hungary used for statistical analyses, which were performed using SPSS 11.0 software. Eight environmental variables were reduced into three variable factors (PC1, PC2 and PC3) using the principal component analysis.…”

Section: Statistical Analysesmentioning

confidence: 99%

The Study of Nodularia Spumigena Bloom Event in the Southern Caspian Sea

Asrollahzadeh¹

2011

Appl Ecol Env Res

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Abstract. Despite the increase in phytoplankton population in the Caspian Sea, there is few detail study regarding bloom of some species in the recent years. Previous studies have announced the bloom-forming Cyanophyta Nodularia spumigena Mertens to the Caspian Sea. In this study, we attempt to understand the bloom events that are involved Nodularia spumigena population and environmental parameters in the Iranian coastal water in 2009. The preliminary results suggested that Nodularia spumigena observed in the Caspian Sea in some seasons at different depths but bloom formation starting from middle of summer and reach a maximum in the early of autumn at the surface. Result of this study also showed that phytoplankton assemblage comprised of 46 species after bloom. Bacillariophyta had the highest number of species (17) follow by Pyrrophyta (14), Cyanophyta and Chlorophyta (6) and Euglenophyta (3). But, phytoplankton species of bloom sample is classified in three groups: Cyanophyta, Pyrrophyta and Bacillariophyta which Cyanophyta dominated over the other groups of algae and formed more than 98% and 96% of phytoplankton abundance and biomass, respectively. As of now, the pattern of dominant and frequent species in the Caspian Sea indicated that the health of the water body and aquatic organisms are at risk.

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“…Ka or partition coefficient of the compound between sediment and water, K~ or the Kd corrected for the organic carbon content) (Schwarzenbach et al, 1993). For metals, the main processes are the co-precipitation and the co-reaction with oxides and hydroxides of manganese and iron, humic acids, sulfides and clays (Foerstner and Wittmann, 1981;Schoer, 1985;Belzile et al, 1989).…”

Section: Introductionmentioning

confidence: 99%

A five-year study on the heavy-metal pollution of Guanabara Bay sediments (Rio de Janeiro, Brazil) and evaluation of the metal bioavailability by means of geochemical speciation

et al. 1997

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Abstract--Surface sediments of the Guanabara Bay (Rio de Janeiro, Brazil) were analyzed by a sequential extraction procedure for Cd, Cr, Cu, Pb, Zn, Mn and Fe, determining their distribution among five geochemical phases and in the nitric acid extractable phase. Bioavailable phases and non-bioavailable phases have been determined in six transects in the bay to define the significant level of pollution due to sediment meLal contamination. A multiple correlation showed limited responsibility of Mn and Fe oxides and humic acids in the adsorption process, which allowed discrimination among the different processes and suggested the strong influence of the hydrogen sulfide present in the highly reduced bay bottom environment. The authors suggest the need to avoid disturbing bottom sediment by dredging or by artificial bottom aeration which could result in a rapid worsening of the environment due to the accelerated formation of more soluble oxygenated metal compounds making the toxic metals much more available to the benthic fauna and to the bay biota in general. © 1997 Elsevier Science Ltd

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Iron‐oxo‐hydroxides and their significance to the behaviour of heavy metals in estuaries

Cited by 28 publications

References 17 publications

Trace elements levels in sediments of the Czech part of the Elbe river

Trace elements levels in sediments of the Czech part of the Elbe river

The Study of Nodularia Spumigena Bloom Event in the Southern Caspian Sea

A five-year study on the heavy-metal pollution of Guanabara Bay sediments (Rio de Janeiro, Brazil) and evaluation of the metal bioavailability by means of geochemical speciation

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