scholarly journals Distribution and Potential Availability of As, Metals and P in Sediments from a Riverine Reservoir in a Rural Mountainous Catchment (NE Portugal)

2021 ◽  
Vol 18 (11) ◽  
pp. 5616
Author(s):  
Anabela R. Reis ◽  
Marta Roboredo ◽  
João P. R. M. Pinto ◽  
Bernardete Vieira ◽  
Simone G. P. Varandas ◽  
...  
Keyword(s):  
Sediment Quality ◽  
Oxygen Depletion ◽  
Mountainous Catchment ◽  
Quality Guidelines ◽  
Probable Effect Level ◽  
Geochemical Partitioning ◽  
Potential Availability ◽  
Probable Effect ◽  
Effect Level ◽  
Geochemical Investigation

A geochemical investigation was carried out on the bottom sediments of a riverine reservoir, located in a mountainous rural region (NE Portugal), with the aim of evaluating the contents of As, metals and P and their potential availability. The elements contents were detected in the following ranges (µg g−1): As (18–64); Cr (32–128); Cu (39–93); Ni (18–80); Pb (49–160); Zn (207–334); P (1705–2681). The reducible fraction is the most significant in the retention of the elements. Based on their potential relative mobility, the detected metals could be classed as follows: Zn > As, Pb > Cu > Cr, Ni. The results on geochemical partitioning were revealed to be important when the Sediment Quality Guidelines (SQGs) were considered. Arsenic, Cr, Ni, Pb and Zn showed total contents exceeding the values of Probable Effect Level (PEL), but only As occurred in the most potentially available form; Cr and Ni can be considered relatively unavailable, since these are mainly associated with the residual phase. Locally, oxygen depletion could release P into the water column due to the higher concentrations in Fe-P and CDB-P fractions. The potential availability of As, metals and P in sediments indicates that the quality of sediments accumulated in small reservoirs should be considered in management policies.

scholarly journals Effect Thresholds of Metals in Stream Sediments Based on In Situ Oligochaete Communities

Environments ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 31 ◽  
Author(s):  
Régis Vivien ◽  
Carmen Casado-Martínez ◽  
Michel Lafont ◽  
Benoit J.D. Ferrari
Keyword(s):  
Sediment Quality ◽  
Threshold Effect ◽  
Stream Sediments ◽  
Chemical Pollution ◽  
Probable Effect Level ◽  
Threshold Effect Level ◽  
Probable Effect ◽  
Effect Level

Aquatic oligochaetes, comprising a large number of species showing various degrees of resistance to chemical pollution, are recognized as valuable bioindicators of sediments’ quality. In the Geneva area (Switzerland), oligochaete tools were previously tested for assessing the biological quality of stream sediments, and effect thresholds of combined metals (quotients) in sediments were defined. The aims of the present study were to update this previous work with new data acquired in different cantons of Switzerland and to establish effect thresholds on oligochaete communities for individual metals and for combined metals. The oligochaete metrics “Oligochaete index of sediment bioindication (IOBS)”, “oligochaete density” and “percentage of tubificids without hair setae” proved pertinent for assessing the effects of metals and organic matter in sediments. We established a threshold effect level (TELoligo) and probable effect level (PELoligo) for eight metals in sediments (Cr, Ni, Zn, Cu, Pb, Cd, Hg and As) as well as a probable effect level for these metals combined (mPELoligo-Q). These thresholds could be used directly to screen for alteration of in situ communities restricted to sediments and/or for establishing sediment quality standards based on a combination of different biological and ecotoxicological tools.

scholarly journals Assessment of the Environmental Significance of Heavy Metals Pollution in Surficial Sediments of South Brittany Waters, France: An Ecological Risk Assessment Approach

2020 ◽  
Author(s):  
MENG CHUAN ONG ◽  
Hui-Juan Pan ◽  
Noor Azhar Mohamed Shazili ◽  
David Menier ◽  
Virginie Dupont ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Inductively Coupled Plasma ◽  
Sediment Quality ◽  
Aquatic Organisms ◽  
Sediment Quality Guidelines ◽  
Distribution Maps ◽  
Quality Guidelines ◽  
Probable Effect Level ◽  
Threshold Effect Level ◽  
Effect Level

Abstract Distribution patterns of selected heavy metals content in sediments from the Bay of Quiberon and Gulf of Morbihan were studied to understand the current heavy metals contamination due to urbanization and mariculture activities in the coastal area. Therefore, a survey was conducted and 196 sediments collected were characterized for heavy metals content using Inductively Coupled Plasma – Mass Spectrometry (ICP–MS) after mix acid digestion process. The distribution maps of the concentrations of the heavy metals studied were produced as an isopleth map based on data interpolation by the ArcGIS software application. The association with the adverse effects to on aquatic organisms were was determined by the classification of the sediment according to the sediment quality guidelines. Therefore, two approaches were employed namely; direct comparison with Sediment Quality Guidelines (SQGs) by USEPA and comparison with other numerical SQGs, threshold effect level/probable effect level, and effect range low /effect range medium. In order to estimate the effect of multiple contaminations of heavy metals, the mean–ERM–quotient was calculated at each sampling points.

scholarly journals Assessment of the Environmental Significance of Heavy Metals Pollution in Surficial Sediments of South Brittany Waters, France: An Ecological Risk Assessment Approach

2020 ◽  
Author(s):  
MENG CHUAN ONG ◽  
Pan Hui-Juan ◽  
Noor Azhar Mohamed Shazili ◽  
David Menier ◽  
Virginie Dupont ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Environmental Protection Agency ◽  
Sediment Quality ◽  
Sediment Quality Guidelines ◽  
Sampling Point ◽  
Distribution Maps ◽  
Quality Guidelines ◽  
Probable Effect Level ◽  
Threshold Effect Level ◽  
Effect Level

Abstract Distribution patterns of selected heavy metals content in sediments from the Bay of Quiberon and Gulf of Morbihan were studied to understand the current heavy metals contamination due to urbanization and mariculture activities in the coastal area. Therefore, a survey was conducted and 196 sediments collected were characterized for heavy metals content using Inductively Coupled Plasma – Mass Spectrometry (ICP–MS) after mix acid digestion process. The distribution maps of the concentrations of the heavy metals studied were produced as an isopleth map based on data interpolation by the ArcGIS software application. The association with the adverse effects on aquatic organisms was determined by the classification of the sediment according to the sediment quality guidelines. Therefore, two approaches were employed namely; direct comparison with Sediment Quality Guidelines (SQGs) by USEPA (United States Environmental Protection Agency) and comparison with other numerical SQGs, threshold effect level/probable effect level, and effect range low /effect range medium. In order to estimate the effect of multiple contaminations of heavy metals, the mean–ERM–quotient was calculated at each sampling point.

scholarly journals Determination of Cr, Cu, Ni, Pb and Zn in the sediments of Mangueira Lagoon/RS/Brazil

2018 ◽  
Vol 9 (7) ◽  
pp. 236-242
Author(s):  
Marcelo Uarthe Grimmler ◽  
Francisco Osvaldo Peres Pereira ◽  
Lucas Aldrigui Silveira ◽  
Leandro Dos Santos ◽  
Pedro José Sanches Filho
Keyword(s):  
Toxic Metals ◽  
Threshold Effect ◽  
Quality Guidelines ◽  
Probable Effect Level ◽  
Threshold Effect Level ◽  
Probable Effect ◽  
Effect Level ◽  
Future Work ◽  
Geological Formations

The Mangueira Lagoon is 123 km long and 7.6 km wide at its widest point, with an average depth of 2.5 m. By the fact that this lagoon is one of the youngest geological formations on Earth (only 4.5 thousand years), little is known about the geology of its sediments. This work describes the concentration of the toxic metals Cr, Cu, Ni, Pb and Zn in surface sediments samples of Mangueira Lagoon. The sediment samples were collected and underwent pseudo-acid digestion (aqua regia / perchloric acid). The extracts obtained were analyzed by atomic absorption spectroscopy in flame. Cu and Zn were detected at all points during the test. Zn is a major element, ranging from 2.5 mg kg-1 ± 0.3% to 4.1 mg kg-1 ± 2.4%, followed by Cu with values between 2.0 mg kg-1 ± 8.5% to 2.5 mg kg-1 ± 4.2%. Considering the parameters established by the CCME (Canadian Environmental Quality Guidelines), TEL (Threshold Effect Level) and PEL (Probable Effect Level), the concentrations of toxic metals found in the surface sediment were low and showed low environmental impacts. These results constitute a contribution to a better understanding of the processes that occur in the region, serving as a basis for future work.

Assessment of element concentrations in surface sediment samples from Sığacık Bay (eastern Aegean)

2020 ◽  
Vol 29 (7) ◽  
pp. 1154-1166
Author(s):  
Özde BAKAK ◽  
Filiz KÜÇÜKSEZGİN ◽  
Faik Erdeniz ÖZEL
Keyword(s):  
Sediment Quality ◽  
Contamination Factor ◽  
Threshold Effect ◽  
Anthropogenic Sources ◽  
Western Anatolia ◽  
Quality Guidelines ◽  
Probable Effect Level ◽  
Threshold Effect Level ◽  
Eastern Aegean ◽  
Effect Level

Concentrations of Al, Fe, As, Co, Cr, Cu, Mn, Ni, Pb, Zn, Hg, and organic carbon, and grain size distribution were investigated in the surface sediments of 7 sampling stations in the Sığacık Bay (western Anatolia) in December 2016. At all of the sampling stations, the concentrations of Pb, Ni, Cr, and As were higher than the average shale values. The highest concentrations of Pb, Cu, Zn, As, and Hg were found at stations near Doğanbey Cape. The possible sources of pollution were evaluated using several parameters: the enrichment factor (Ef), contamination factor (Cf), and contamination degree (Cd). The Ef values ranged between 0.12 and 7.61 in the bay. The high Ef (>1.5) values of Pb, Cu, Ni, Co, and As were assessed to explain the influence of anthropogenic sources. Additionally, the Cf values ranged from 0.46 to 5.61, while the Cd values ranged from 11.69 to 20.45 in the study area. The Cd of the Cr and As ranged between moderate and considerable, and the highest Cd was measured at stations near Doğanbey Cape. Additionally, the pollution degrees were assessed using sediment quality guidelines (SQGs), the threshold effect level (TEL), the probable effect level (PEL), the effects range low (ERL), and the effects range median (ERM). It was demonstrated that the sediments were generally heavily polluted with Cr and Ni, and moderately with Pb and Cu, according to the numerical SQGs. The concentrations of Pb, Cr, Cu, Zn, and Ni were above the TEL, while Cr and Ni were also higher than the PEL levels for all of the samples.

Analyzing the Spatial Distribution of Sediment Contamination in the Lower Great Lakes

2005 ◽  
Vol 40 (4) ◽  
pp. 389-401 ◽  
Author(s):  
K. Wayne Forsythe ◽  
Chris H. Marvin
Keyword(s):  
Spatial Distribution ◽  
Lake Erie ◽  
Biological Effects ◽  
Sediment Quality ◽  
Lake Ontario ◽  
Threshold Effect ◽  
Quality Guidelines ◽  
Probable Effect Level ◽  
Threshold Effect Level ◽  
Effect Level

Abstract Despite significant reductions in contaminant concentrations over the past 30 years, large areas within Lake Erie and Lake Ontario still exceed Canadian sediment quality guidelines. Hexachlorobenzene (HCB), polychlorinated biphenyls (PCBs), lead (Pb) and mercury (Hg) can persist for long periods of time in the environment and cause significant ecosystem damage. Analyses of the spatial distribution of these contaminants were carried out using a GIS-based kriging technique. Initially, statistically valid results were obtained for three of four contaminants in Lake Erie (HCB, Pb, Hg) and two of four (HCB, Hg) in Lake Ontario. Acceptable concentration estimates were subsequently achieved for all contaminants following log-normal transformation kriging analyses. In general, the concentration of contaminants was lower in sediment collected in Lake Erie than in Lake Ontario. In many areas of Lake Erie, the concentrations were under both the probable effect level (PEL) and the threshold effect level (TEL), which relate to the severity of adverse biological effects that may be expected. Greater concentrations of these contaminants were observed in Lake Ontario sediments, which can be partly explained by the bathymetry and current circulation patterns in the lake.

scholarly journals Speciation Variation and Comprehensive Risk Assessment of Metal(loid)s in Surface Sediments of Intertidal Zones

2018 ◽  
Vol 15 (10) ◽  
pp. 2125 ◽  
Author(s):  
Baocui Liang ◽  
Xiao Qian ◽  
Shitao Peng ◽  
Xinhui Liu ◽  
Lili Bai ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Surface Sediments ◽  
Yellow River ◽  
Biological Effects ◽  
Risk Index ◽  
Sediment Quality ◽  
Residual Fraction ◽  
Intertidal Zones ◽  
Probable Effect Level ◽  
Effect Level

Speciation variation and comprehensive risk assessment of metal(loid)s (As, Cd, Cr, Cu, Mn, Ni, Pb and Zn) were investigated in surface sediments from the intertidal zones of the Yellow River Delta, China. Results showed that only the concentrations of As, Cd and Pb were significantly different between April and September (p < 0.01). In April, the residual fraction (F4) was predominant for As, Cr, Cu, Ni and Zn. However, the exchangeable and carbonate-associated fraction (F1) was dominant for Cd averaging 49.14% indicating a high environmental risk. In September, the F4 fraction was predominant and the F1 fraction was very low for most metal(loid)s except Cd and Mn. The geo-accumulation index (Igeo), the F1 fraction and potential ecological risk index (PERI) of most metal(loid)s were relatively low in surface sediments for both seasons. But Pb, As and Ni were between the threshold effect level (TEL)and the probable effect level (PEL) for 66.67%, 83.33% and 91.67% in April and As and Ni were between TEL and PEL for 41.67% and 91.67%, which indicated that the concentration of them was likely to occasionally exhibit adverse effects on the ecosystem. Although the Igeo, the F1 fraction or PERI of Cd in both seasons was higher at some sites, the results of sediment quality guidelines (SQGs) indicated that the biological effects of Cd were rarely observed in the studied area.

Metal and phosphorus in bottom sediment of a small-sized reservoir in a rural mountainous catchment (NE Portugal): accumulation and geochemical mobility

2020 ◽  
Author(s):  
Anabela Reis ◽  
Marta Roboredo
Keyword(s):  
Anthropogenic Activities ◽  
Sediment Quality ◽  
Extraction Procedure ◽  
Sediment Flux ◽  
Residual Fraction ◽  
Sediment Retention ◽  
Probable Effect Level ◽  
Threshold Effect Level ◽  
Geochemical Phases ◽  
Effect Level

&lt;p&gt;Small-sized reservoirs have less capacity for the retention of sediment but are widely distributed in regulated basins. Therefore, small reservoirs collectively impart an important anthropogenic signature to the global sediment-flux, increasing the mean sediment retention when compared with estimates of mean sediment retention of large reservoirs.&lt;/p&gt;&lt;p&gt;A geochemical study of sediment-associated metal and phosphorus from a small-sized riverine reservoir, located in a mountainous rural region (Vila Real in NE Portugal), was conducted to evaluate the effectiveness of the reservoir as traps for these elements. The contents of metals and P were determined, as well as their spatial distribution pattern and their potential availability by using a four-step sequential extraction procedure for metals and the Chang and Jackson fractionation for P.&lt;/p&gt;&lt;p&gt;The metal contents in sediments were in the ranges of (&amp;#181;g/g): Cr (22-122); Cu (31-83); Ni (5-71); Pb (49-160); Zn (207-334). All the geochemical phases studied were important in the retention of the metals; within the most labile fractions, the reducible fraction was the most significant. The studied elements can be classed by potential relative mobility: Zn &gt; Pb &gt; Cu &gt; Cr, Ni. The partition of elements contents through the geochemical phases and the balance between contents associated with the most mobile fractions and with the residual fraction suggest an important contribution from lithology to the total contents of Cr and Ni, and a significant contribution of anthropogenic activities to the contents of Cu, Pb, and Zn in the sediments from the reservoir. The analysis of the results on the geochemical partitioning of metals revealed to be important when the Sediment Quality Guidelines (SQGs) are considered. Phosphorus showed contents ranging between 1518-2454 &amp;#181;g/g; most samples revealed the predominance of the Fe-P fraction.&lt;/p&gt;&lt;p&gt;In general, the sediments of the reservoir showed maximum values of contents of metals above the Threshold Effect Level (TEL, &amp;#181;g/g: Cr-37.3; Cu-35.7; Ni-18; Pb-35; Zn-123). Chromium, Ni, Pb and Zn showed total contents exceeding the values of Probable Effect Level (PEL, &amp;#181;g/g: Cr-90; Cu-197; Ni-36; Pb-91.3; Zn-315). Chromium and Ni showed higher values than the reference ones, but these can be considered relatively unavailable since they are associated with the residual phase. The potentially available and/or total amounts of metals and P in sediments were relatively high, indicating that the quality of bottom sediments accumulated in this small-sized reservoir should be considered in management policies.&lt;/p&gt;

scholarly journals Baseline Study of Trace Element Concentrations in Sediments of the Intertidal Zone of Amazonian Oceanic Beaches

2021 ◽  
Vol 8 ◽  
Author(s):  
Jéssica C. E. Vilhena ◽  
Ana Amorim ◽  
Lourenço Ribeiro ◽  
Bernardo Duarte ◽  
Maíra Pombo
Keyword(s):  
Trace Elements ◽  
Trace Element ◽  
Ecological Risk ◽  
Risk Index ◽  
Sediment Quality ◽  
Contamination Factor ◽  
Probable Effect Level ◽  
Threshold Effect Level ◽  
Sampling Points ◽  
Effect Level

Analyzing the presence and quantifying trace elements is of paramount importance to understand natural environmental processes and monitor the degree of anthropogenic disturbance to mitigate impacts already caused. Here, we aimed to establish a baseline of the trace elements profile and concentrations in sandy sediments of intertidal areas of three Amazonian beaches (Brazil). For each beach, sediments were collected from three different sectors (south, center, and north) and five shoreline distance levels (from the high- to the low-water mark), totalizing 15 samples per beach. The concentration of the different trace elements (Mg, Al, P, S, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Br, Rb, Sr, Y, Zr, Cd, Sn, I, Hg, and Pb) was determined by Total reflection X-ray Fluorescence spectrometry. Sediment was also characterized for its grain size, organic matter, and pH. To assess possible enrichment due to anthropogenic activities we compared trace element levels with the values for the Earth’s crust and calculated pollution indexes: geoaccumulation index (Igeo), ecological risk index (RI), contamination factor (CF), pollution load index (PLI), and sediment quality guideline (SQG), threshold effects level (TEL) and probable effects level (PEL). Individual trace metal concentrations did not vary significantly between beaches, sectors, or sample levels, evidencing a homogeneity of trace elements composition and concentrations across this environment. Igeo indicated 62.2% of the sampling stations uncontaminated, 20.0% from uncontaminated to moderately contaminated, and 4.44% (two sampling stations) strongly contaminated, the same two areas classified as high ecological risk by RI. Most of the sampling points presented low CF. Cadmium and Hg were the only elements that showed moderate to very high values of CF. According to the SQGs, 77.7 and 8.8% of the sampling points presented values above the moderate threshold effect level (SQG-TEL) and probable effect level (SQG-PEL), respectively. All points were classified as non-polluted according to the PLI. Our results show that the three beaches present safe levels of almost of the elements demonstrating the good state of preservation. Most of the indexes classified the sampling points as non-polluted, except for Cd and Hg in a few specific sampling points.

scholarly journals Geovisualization of Mercury Contamination in Lake St. Clair Sediments

2021 ◽  
Author(s):  
K. Wayne Forsythe ◽  
Chris H. Marvin ◽  
Christine J. Valancius ◽  
James P. Watt ◽  
Joseph M. Aversa ◽  
...  
Keyword(s):  
Great Lakes ◽  
Marine Ecosystem ◽  
Three Dimensional ◽  
Mercury Pollution ◽  
Mercury Contamination ◽  
Pollution Levels ◽  
Probable Effect Level ◽  
Outflow Channels ◽  
Probable Effect ◽  
Effect Level

The Laurentian Great Lakes of North America contain approximately 20% of the earth’s fresh water. Smaller lakes, rivers and channels connect the lakes to the St. Lawrence Seaway, creating an interconnected freshwater and marine ecosystem. The largest delta system in the Great Lakes is located in the northeastern portion of Lake St. Clair. This article focuses on the geovisualization of total mercury pollution from sediment samples that were collected in 1970, 1974 and 2001. To assess contamination patterns, dot maps were created and compared with surfaces that were generated using the kriging spatial interpolation technique. Bathymetry data were utilized in geovisualization procedures to develop three-dimensional representations of the contaminant surfaces. Lake St. Clair generally has higher levels of contamination in deeper parts of the lake, in the dredged shipping route through the lake and in proximity to the main outflow channels through the St. Clair delta. Mercury pollution levels were well above the Probable Effect Level in large portions of the lake in both 1970 and 1974. Lower contaminant concentrations were observed in the 2001 data. Lake-wide spatial distributions are discernable using the kriging technique; however, they are much more apparent when they are geovisualized using bathymetry data.

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