A suitable model for the biomonitoring of trace metal bioavailabilities in estuarine sediments: the annelid polychaete Nereis diversicolor

The need to use biomonitors representative of the sedimentary compartment has been recognized, particularly in estuaries. Thus, trace metal contamination has been monitored in an infaunal polychaete worm Nereis diversicolor and sediments in the Seine estuary and comparatively in the relatively clean Authie estuary (French coast of the English Channel) over two years taking samples every three months at both sites. No correlations were shown between total metal (Ag, Cd, Cu, Pb, Zn) concentrations in raw sediments and ragworms. Because these worms are known to be good biomonitors of the bioavailabilities of sedimentary trace metals, it follows that total sediment metal concentrations have a poor predictive ecotoxicological value. Using a correction factor to minimize the influence of weight, it is possible to make a good estimation of the average metal concentrations in a population of worms at a given site, sampling only a limited number of specimens. Metallothioneins are often considered to be good biomarkers of the presence of significant availabilities of trace metals. Metallothionein-like proteins (MTLPs) are present in N. diversicolor, but there is no significant relationship between MTLPs and metal concentrations. This situation might result from the importance of metal-containing granules, both extra- and intracellular, in ragworms.

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Metal contamination and oxidative stress biomarkers in estuarine fish following a mine tailing disaster

10.1101/2020.06.29.177253 ◽

2020 ◽

Author(s):

Fabrício Ângelo Gabriel ◽

Rachel Ann Hauser-Davis ◽

Lorena Oliveira Souza Soares ◽

Ana Carolina de Azevedo Mazzuco ◽

Rafael Christian Chávez Rocha ◽

...

Keyword(s):

Trace Metals ◽

Trace Metal ◽

Muscle Tissue ◽

Fish Species ◽

Metal Contamination ◽

Contaminated Sediments ◽

Estuarine Sediments ◽

Estuarine Fish ◽

Human Consumption ◽

Metal Concentrations

AbstractThe Rio Doce estuary in Brazil was impacted by the deposition of mine tailings caused by the collapse of a mining dam in 2015. Since the disaster, the estuary is experiencing chronic trace metal contamination effects, but potential trace metal accumulation in fishes has not been reported. Trace metals in aquatic ecosystems pose severe threats to the aquatic biota, so we hypothesized that the accumulation of trace metals in estuarine sediments nearly two years after the disaster would cause contaminant bioaccumulation, resulting in the biosynthesis of metal-responsive proteins in fishes. We determined trace metal concentrations in sediment samples, metal concentrations, and quantified stress protein concentrations in the liver and muscle tissue of five different fish species in the estuary. Our results revealed high concentrations of trace metals in estuarine sediments when compared to published baseline values for this estuary. The demersal fish species Cathorops spixii and Genidens genidens had the highest Hg, As, Se, Cr, and Mn concentrations in both hepatic and muscle tissues. Metal bioaccumulation in fish was statistically correlated with the biosynthesis of metallothionein and reduced glutathione in both fish liver and muscle tissue. The trace metals detected in fish tissues resemble those in the contaminated sediments present at the estuary at the time of this study and were also significantly correlated to protein levels. Trace metals in fish muscle were above the maximum permissible limits for human consumption, suggesting potential human health risks that require further determination. Our study supports the high biogeochemical mobility of trace metals between contaminated sediments and local biota in estuarine ecosystems.

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Analysis of Trace Metal Contamination in Pahang River and Kelantan River, Malaysia

MATEC Web of Conferences ◽

10.1051/matecconf/201926604003 ◽

2019 ◽

Vol 266 ◽

pp. 04003 ◽

Cited By ~ 1

Author(s):

Norpadzlihatun Manap ◽

Kavitha Sandirasegaran ◽

Noor Shahifah Syahrom ◽

Amnorzahira Amir

Keyword(s):

Trace Metals ◽

Trace Metal ◽

Metal Contamination ◽

Sediment Quality ◽

Primary Objective ◽

Trace Metal Concentration ◽

Trace Metal Contamination ◽

Quality Guidelines ◽

Fish Samples ◽

Negative Impacts

The primary objective of this study is to determine trace metal contamination in environmental samples obtained from Pahang River and Kelantan River, Malaysia which may help to identify the risk of sustainable dredging in these areas. This research also proceeds to compare the trace metal concentration with the National Water Quality Standards of Malaysia, Interim Canadian Sediment Quality Guidelines and Malaysian Food Act 1983 to determine its limits and risks. Samples of water, sediment, snails and fishes were collected and analyzed for As, Cu, Cd, Cr, Fe, Pb, Ni, Mn, and Hg by using atomic absorption spectrophotometer. It was found that the concentration of trace metals namely As, Cu, Cd, Cr, Pb, Ni, and Hg in river water, sediment, snail and fish samples in Pahang River were lower than the maximum allowable limits, except for Fe and Mn. In Kelantan River, the concentration of trace metals indicating that it is contaminated with Fe, Mn, Pb, Cr, Cu, Hg, and As as all trace metals exceeded the maximum allowable limits. Negative impacts may arise, and the river may contaminate more in future if there is no proper management to tackle this issue during execution of dredging activities.

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Contamination and oxidative stress biomarkers in estuarine fish following a mine tailing disaster

PeerJ ◽

10.7717/peerj.10266 ◽

2020 ◽

Vol 8 ◽

pp. e10266 ◽

Cited By ~ 1

Author(s):

Fabrício Â. Gabriel ◽

Rachel Ann Hauser-Davis ◽

Lorena Soares ◽

Ana Carolina A. Mazzuco ◽

Rafael Christian Chavez Rocha ◽

...

Keyword(s):

Trace Metals ◽

Trace Metal ◽

Human Health ◽

Health Risks ◽

Fish Species ◽

Reduced Glutathione ◽

Estuarine Sediments ◽

Metal Concentrations ◽

Human Health Risks ◽

Muscle Tissues

Background The Rio Doce estuary, in Brazil, was impacted by the deposition of iron mine tailings, caused by the collapse of a dam in 2015. Based on published baseline datasets, the estuary has been experiencing chronic trace metal contamination effects since 2017, with potential bioaccumulation in fishes and human health risks. As metal and metalloid concentrations in aquatic ecosystems pose severe threats to the aquatic biota, we hypothesized that the trace metals in estuarine sediments nearly two years after the disaster would lead to bioaccumulation in demersal fishes and result in the biosynthesis of metal-responsive proteins. Methods We measured As, Cd, Cr, Cu, Fe, Mn, Pb, Se and Zn concentrations in sediment samples in August 2017 and compared to published baseline levels. Also, trace metals (As, Cd, Cr, Cu, Fe, Hg, Mn, Pb, Se and Zn) and protein (metallothionein and reduced glutathione) concentrations were quantified in the liver and muscle tissues of five fish species (Cathorops spixii, Genidens genidens, Eugerres brasilianus, Diapterus rhombeus and Mugil sp.) from the estuary, commonly used as food sources by local populations. Results Our results revealed high trace metal concentrations in estuarine sediments, when compared to published baseline values for the same estuary. The demersal fish species C. spixii and G. genidens had the highest concentrations of As, Cr, Mn, Hg, and Se in both, hepatic and muscle, tissues. Trace metal bioaccumulation in fish was correlated with the biosynthesis of metallothionein and reduced glutathione in both, liver and muscle, tissues, suggesting active physiological responses to contamination sources. The trace metal concentrations determined in fish tissues were also present in the estuarine sediments at the time of this study. Some elements had concentrations above the maximum permissible limits for human consumption in fish muscles (e.g., As, Cr, Mn, Se and Zn), suggesting potential human health risks that require further studies. Our study supports the high biogeochemical mobility of toxic elements between sediments and the bottom-dwelling biota in estuarine ecosystems.

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Trace metals as tracers of dredging activity in Cleveland Bay — field and laboratory studies

Marine and Freshwater Research ◽

10.1071/mf9941237 ◽

1994 ◽

Vol 45 (7) ◽

pp. 1237 ◽

Cited By ~ 48

Author(s):

AJ Reichelt ◽

GB Jones

Keyword(s):

Trace Metals ◽

Trace Metal ◽

Metal Contamination ◽

Laboratory Studies ◽

Dredged Sediment ◽

Trace Metal Contamination ◽

Acid Leach ◽

Pollutant Concentrations ◽

Before And After ◽

Copper Zinc

This study has investigated in detail trace metal concentrations in Cleveland Bay in the central Great Barrier Reef and assessed the significant carrier phases of several metals during a simulated disturbance of sediments designed to investigate the effects of dredging. Organic, iron oxide and carbonate phases were shown to be important carrier phases for several trace metals. The application of an acid-leach technique to monitor labile or pollutant concentrations of copper, zinc, lead and nickel in sediments collected from coral reefs sampled before and after two dredging events in 1991 yielded useful information on the fate of dredged sediment. Trace metal contamination close inshore was attributed to port activities, sewage discharge and urbanization.

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Farmland Trace Metal Contamination and Management Model—Model Development and a Case Study in Central Taiwan

Sustainability ◽

10.3390/su122310066 ◽

2020 ◽

Vol 12 (23) ◽

pp. 10066

Author(s):

Hsin-Yi Yang ◽

Sheng-Kung Chen ◽

Jiun-Shiuan Wang ◽

Chih-Jen Lu ◽

Hung-Yu Lai

Keyword(s):

Water Quality ◽

Trace Metals ◽

Trace Metal ◽

Paddy Soil ◽

Irrigation Water ◽

Metal Contamination ◽

Metal Species ◽

Management Model ◽

Trace Metal Contamination ◽

Central Taiwan

In this study, the water quality of the irrigation system and concentration of trace metals in the sediments were combined to establish a farmland trace metal contamination and management model (FTM_CMM). The purpose of this model was to clarify the main sources of the trace metals that have caused the contamination of paddy soil in central Taiwan. The results of the model simulation showed that the trace metals in the paddy soil mainly came from the irrigation water and especially from the sediments in the irrigation channels. The contribution of the sediments in the irrigation channel to the individual trace metals in the paddy soil ranged from 56% to 72% as the contributions for Cr, Cu, Ni, and Zn were 72%, 68%, 56%, and 62%, respectively. The trace metal species according to their concentration in the contaminated soil ranked in the order of Zn > Cr ≈ Cu > Ni, which is about the same as in the channel sediment. During the simulation process, Cr, Cu, Ni, and Zn exceeded the control standards for farmlands in the 18th, 12th, 13th, and 17th years, respectively. This highlights that, in addition to the management of irrigation water quality, the management of trace metal contaminated sediment in adjacent canal irrigation systems is also an important part of the prevention of trace metal contamination in farmland.

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Silicon Cleaning Methods Compared at Metal Concentrations Below 1E10 atoms/cm2

MRS Proceedings ◽

10.1557/proc-606-245 ◽

1999 ◽

Vol 606 ◽

Author(s):

Joseph Ilardi ◽

Rajananda Saraswati ◽

George Schwartzkopf

Keyword(s):

Hydrogen Peroxide ◽

Trace Metals ◽

Trace Metal ◽

Silicon Wafer ◽

Metal Contamination ◽

Single Step ◽

Wafer Surface ◽

Trace Metal Contamination ◽

Wide Range ◽

Contamination Levels

AbstractAn alkaline aqueous silicon wafer cleaner has been developed which reduces trace metal contamination levels on “p-type” unpatterned silicon wafers to below 1E10 atoms/cm2 without acidic cleaning. This patented technology uses a specially formulated buffering system consisting of an oxidation resistant chelating agent and salt of a weak acid. The aqueous cleaner maintains a stable pH of about 9.5 over a wide range of dilutions, temperatures, hydrogen peroxide concentrations and bath aging times. A single-step bath, megasonic bath or spray clean with this formulation leaves the chemical oxide on the silicon wafer surface free of particles, atomically smooth, free of organics and lower in trace metal contamination levels than similar surfaces cleaned with conventional formulations.An analytical method was developed which allows the reliable detection of trace metals on silicon wafer surfaces down to 1E8 atoms/cm2 for aluminum, calcium, copper, iron, nickel, sodium and zinc. The procedure uses an ICP-MS with a concentric nebulizer and a desolvator. The acids used were ultrapure to keep the blanks to a very minimum and analyses were run in a class 10 clean room. The trace metals on the wafer were extracted using known amounts of ultrapure acids and were directly aspirated using a special arrangement with the concentric nebulizer. The J.T. Baker cleaner was compared to and outperformed the conventional RCA-1&2 clean and dilute RCA-1&2 chemistries using ultrapure ammonium hydroxide, hydrochloric acid and hydrogen peroxide.

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Trace metals in sediments from the Yarra River

Marine and Freshwater Research ◽

10.1071/mf9820761 ◽

1982 ◽

Vol 33 (5) ◽

pp. 761 ◽

Cited By ~ 18

Author(s):

M Ellaway ◽

BT Hart ◽

R Beckett

Keyword(s):

Trace Metals ◽

Trace Metal ◽

Metal Concentration ◽

Estuarine Sediments ◽

Trace Metal Concentration ◽

Metal Concentrations ◽

Lead And Zinc ◽

Sediment Fraction ◽

Copper Lead ◽

Yarra River

The distribution and phase association of iron, manganese, cadmium, copper, lead and zinc in bottom sediments taken from the freshwater, estuarine and bay regions of the Yarra River were investigated. The fraction of the estuarine sediments smaller than 20 �m contained substantially higher concentrations of cadmium, copper, lead and zinc than did the corresponding sediment fraction from the upper river and bay regions. Sequential chemical extraction revealed that most of the variability in the trace metal concentration of these sediments was associated with changes in the reducible phase. A substantial increase in trace metal concentrations occurred in going from river to estuarine sediments. For example, the lead concentration increased approximately eightfold (43-375 �g g-1), the zinc fourfold (122-447 �g g-1) and the copper almost twofold (64-106 �g g-1). This was attributed to coagulation and sedimentation of trace-metal- enriched iron and manganese oxides in the estuarine region. The subsequent decrease in metal concentrations in the bay sediments was due to either physical dilution of the contaminated sedlment with material of lower metal concentration or remobilizatlon of the trace metals from sediments deposited in the bay.

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Method of Detecting Trace Metal Contamination in Thick-Film SOI Device

ISTFA 2005: Conference Proceedings from the 31st International Symposium for Testing and Failure Analysis ◽

10.31399/asm.cp.istfa2005p0220 ◽

2005 ◽

Author(s):

Yasunori Goto ◽

Hiroomi Eguchi ◽

Masaru Iida

Keyword(s):

Trace Metal ◽

Thick Film ◽

Metal Contamination ◽

Semiconductor Device ◽

Trace Element Analysis ◽

Silicon On Insulator ◽

Element Analysis ◽

Trace Metal Contamination ◽

Trace Metal Elements ◽

Output Characteristics

Abstract In the automotive IC using thick-film silicon on insulator (SOI) semiconductor device, if the gettering capability of a SOI wafer is inadequate, electrical characteristics degradation by metal contamination arises and the yield falls. At this time, an automotive IC was made experimentally for evaluation of the gettering capability as one of the purposes. In this IC, one of the output characteristics varied from the standard, therefore failure analysis was performed, which found trace metal elements as one of the causes. By making full use of 3D perspective, it is possible to fabricate a site-specific sample into 0.1 micrometre in thickness without missing a failure point that has very minute quantities of contaminant in a semiconductor device. Using energy dispersive X-ray, it is possible to detect trace metal contamination at levels 1E12 atoms per sq cm. that are conventionally detected only by trace element analysis.

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