scholarly journals Trace metal partitioning and potential mobility in the naturally acidic sediment of Lake Caviahue, Neuquén, Argentina

2020 ◽  
Vol 47 (1) ◽  
pp. 46 ◽  
Author(s):  
Juan Manuel Cabrera ◽  
Pedro Félix Temporetti ◽  
Fernando Luis Pedrozo
Keyword(s):  
Organic Matter ◽  
Trace Metal ◽  
Metal Content ◽  
Limit Of Detection ◽  
Sediment Quality ◽  
Extraction Procedure ◽  
Metal Mobility ◽  
Acid Volatile Sulfide ◽  
Lake Basin ◽  
Metal Partitioning

Lake Caviahue, in Patagonia (Argentina), is a very acid water body (Patagonia, Argentina) due to the influx of volcanic fluids. Over the past 18 years, the lake has been progressively alkalinizing and pH is close to the ferric iron precipitation threshold (pH>3,0). Should iron precipitate, wáter and sediment composition will be altered. To set a baseline, trace metal partitioning (Cu, Cd, Cr, Pb, Zn and Mn) was studied for three sediment cores (0 to 16 cm depth) at three sampling stations using a sequential extraction procedure (SEP) and the acid volatile sulfide/simultaneously extracted metals (AVS/SEM) protocol. The total metals content of the sediments ranged between 0 to 408 μg g-1 of dry sediment, with Pb>Cr>Mn>Cu>Zn>Cd. No Cd was measured above the limit of detection. The sediment was richest in Mn and Cr, two non-toxic metals at the pH / Eh combination of the lake basin. Total Pb was at a moderate contamination level although it is associated with the most recalcitrant fraction and therefore has low mobility. The sediment fractions with higher metal content were the oxidizable and residual, the former commonly associated with labile organic matter and pyrite while the latter are related to recalcitrant organic matter and rock forming minerals. In addition, a high correlation was found between Cr, Pb and Mn,thus these metals may be subject to analogous precipitation processes and possibly to co-variation in the volcano effluents. Furthermore, no metals were detected in the exchangeable/carbonates fraction, which is the most labile of all the sediment fractions. The metal content in (SEM) was likewise below the toxicity thresholds of two international sediment quality guidelines and the ratio AVS/SEM was over one, indicative of non-toxicity. Both results indicate that metal mobility in the acidic sediments of lake Caviahue is very low.

scholarly journals Trace Metal Content of Sediments Close to Mine Sites in the Andean Region

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Cristina Yacoub ◽  
Agustí Pérez-Foguet ◽  
Nuria Miralles
Keyword(s):  
Trace Metal ◽  
Ecological Risk ◽  
Metal Content ◽  
Sediment Quality ◽  
Pollution Sources ◽  
Quality Analysis ◽  
Mine Site ◽  
Sediment Samples ◽  
Trace Metal Content ◽  
Mine Sites

This study is a preliminary examination of heavy metal pollution in sediments close to two mine sites in the upper part of the Jequetepeque River Basin, Peru. Sediment concentrations of Al, As, Cd, Cu, Cr, Fe, Hg, Ni, Pb, Sb, Sn, and Zn were analyzed. A comparative study of the trace metal content of sediments shows that the highest concentrations are found at the closest points to the mine sites in both cases. The sediment quality analysis was performed using the threshold effect level of the Canadian guidelines (TEL). The sediment samples analyzed show that potential ecological risk is caused frequently at both sites by As, Cd, Cu, Hg, Pb, and Zn. The long-term influence of sediment metals in the environment is also assessed by sequential extraction scheme analysis (SES). The availability of metals in sediments is assessed, and it is considered a significant threat to the environment for As, Cd, and Sb close to one mine site and Cr and Hg close to the other mine site. Statistical analysis of sediment samples provides a characterization of both subbasins, showing low concentrations of a specific set of metals and identifies the main characteristics of the different pollution sources. A tentative relationship between pollution sources and possible ecological risk is established.

Copper complexing properties, trace metal content and organic matter physico-chemical characterization of Greek beers

2017 ◽  
Vol 135 ◽  
pp. 66-73 ◽  
Author(s):  
Aikaterini Sakellari ◽  
Sotirios Karavoltsos ◽  
Marta Plavšić ◽  
Eleni Bempi ◽  
Georgia Papantonopoulou ◽  
...  
Keyword(s):  
Organic Matter ◽  
Trace Metal ◽  
Metal Content ◽  
Chemical Characterization ◽  
Physico Chemical ◽  
Trace Metal Content ◽  
Complexing Properties

Trace metal speciation in the Yamaska and St. François Rivers (Quebec)

1980 ◽  
Vol 17 (1) ◽  
pp. 90-105 ◽  
Author(s):  
A. Tessier ◽  
P. G. C. Campbell ◽  
M. Bisson
Keyword(s):  
Organic Matter ◽  
Trace Metals ◽  
Trace Metal ◽  
Suspended Sediment ◽  
Extraction Procedure ◽  
Municipal Sewage ◽  
Residual Fraction ◽  
Metal Concentrations ◽  
Sediment Samples ◽  
Mn Oxides

Water and suspended sediment samples were collected at 12 stations on the Yamaska and St. François Rivers, located in southeastern Quebec, and were analyzed for the trace metals Cd, Co, Cu, Ni, Pb, Zn, Fe, and Mn. The suspended sediment samples were subjected to a sequential extraction procedure designed to partition the particulate trace metals into five fractions: (1) exchangeable; (2) bound to carbonates; (3) bound to Fe–Mn oxides; (4) bound to organic matter; and (5) residual.Although suspended sediment levels as well as total soluble and particulate trace metal concentrations were highly variable in time and space, speciation patterns for each metal proved reasonably constant. Very small proportions of all metals, except Cd and Mn, were found in the exchangeable fraction, whereas high levels of all metals were present in the residual fraction; Fe–Mn oxides and organic matter constituted important transport phases for most metals. Deviations from this general behaviour were occasioned by man-induced perturbations (e.g., inputs of municipal sewage or mine waste water). At stations influenced by such factors, total particulate metal concentrations increased and the relative contribution of the residual fraction decreased. The trace metal content of fraction 3 proved to be particularly sensitive to anthropogenic inputs; other phases acting as trace metal sinks included those liberated in fractions 1 (Cd, Cu, Ni, Zn), 2(Cu, Ni, Zn), and 4(Cu, Ni).

A comparative biogeochemical study of sediments from Kandalaksha Bay, White Sea, Russian Arctic

Polar Record ◽  
2003 ◽  
Vol 39 (4) ◽  
pp. 357-367 ◽  
Author(s):  
Sofia Koukina ◽  
Galina Korneeva ◽  
Lioudmila Ametistova ◽  
Tatiana Bek
Keyword(s):  
Organic Matter ◽  
Trace Metal ◽  
White Sea ◽  
Sediment Quality ◽  
Enzymatic Activities ◽  
Small Scale ◽  
Russian Arctic ◽  
Geochemical Composition ◽  
Kandalaksha Bay ◽  
Metal Contents

Major (Al, Fe), minor (Mn), and trace (Li, Cu, Ni, Cr, Cd, Zn, Pb) metals along with nutrients (TOC, TON, TS, TP) and enzymatic activities were determined in 18 surface sediment and two soil samples collected in six small bays of the Karelian shore of Kandalaksha Bay, White Sea, Russian Arctic. The studied sediments tended to be marine, with a major input of organic matter from autochthonous sources. Marine organic material might be an important carrier of trace metals in the examined sediments. According to sediment quality guidelines, all trace-metal contents were below the threshold levels. The results of azocasein-trypsin tests also suggested no significant contamination of analysed sediments and soils. A comparison of the trace-metal contents in the sediments examined with those of the western Arctic shelf showed higher levels of Zn and Cr in the Karelian shore. Presumably these disparities were related to regional differences in sediment chemistries rather than to any enhanced pollution within the studied area. Both geochemical composition and enzymatic-activities patterns among sites studied are largely controlled by the sediment granulometry. The evolution of sediments in the restricted exchange environments under investigation is caused by depositional conditions, which are strongly affected by small-scale hydrodynamic processes specific for each particular area. The most vivid examples are separating basins, where the fine-grained sediments enriched in organic matter — and thus in nutrients and metals — are formed under calm hydrodynamic conditions enhanced by severely restricted water exchange.

scholarly journals Biogeochemistry of sediments from restricted exchange environments of Kandalaksha Bay, White Sea, Russian Arctic

2011 ◽  
Vol 8 (1) ◽  
pp. 1309-1333
Author(s):  
S. Koukina ◽  
A. Vetrov ◽  
N. Belyaev
Keyword(s):  
Organic Matter ◽  
Metal Content ◽  
White Sea ◽  
Sediment Quality ◽  
Russian Arctic ◽  
The White Sea ◽  
Terrestrial Organic Matter ◽  
Total Metal Content ◽  
Kandalaksha Bay ◽  
Total Metal

Abstract. The White Sea of Russian Arctic is characterized by extreme diversity of enclosed estuarine systems that are often sites of unique biota. The present study focuses on surface sediments from representative restricted exchange environments of the inner part of Kandalaksha Bay, adjacent to the Karelian shore of the White Sea. The TOC and n-alkanes distribution study revealed the major input of terrestrial organic matter into the sediments from higher plants and minor presence of autochthonous microbial sources. Metal (Fe, Mn, Cu, Zn, Cr and Pb) forms study showed that metals in sediments occur mainly in a biogeochemically stable mineral-incorporated form, which comprises up to 98% of total metal content, while labile (acid soluble) and organically bound (alkali soluble) forms make up to 3–11% and 2–12% of total metal content, respectively. Presumably, the major part of both acid soluble and alkali soluble forms is comprised of metals associated with easily soluble amorphous Fe-oxides and bound to sediment organic matter. According to sediment quality guidelines, all trace-metal contents were below the threshold levels. Among sites studied, the heightened contents of bioavailable metal forms are related to sediments enriched in organic matter and/or located within the sea-fresh water barrier zones. The elements studied may be arranged in the following decreasing sequence according to their potential bioavailability: Cu > Zn > Mn > Fe > Cr > Pb. The present study can serve as a basis for comprehensive environmental assessment of the region and objective anoxia prognosis in Arctic ecosystems, while the role of microbial community in element speciation in sediments needs special attention.

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