Arsenic and Trace Metals in Water and Sediment of the Velhas River, Southeastern Iron Quadrangle Region, Minas Gerais, Brazil

Silva, Danilo de C.; Bellato, Carlos Roberto; Neto, José de Oliveira Marques; Fontes, Maurício Paulo Ferreira

doi:10.21577/0100-4042.20170275

Cited by 9 publications

(3 citation statements)

References 39 publications

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“…For three centuries, the region has stood out as one of the most important regions of gold exploitation in Brazil (mining and rudimentary gold exploitation). The mineral assemblages present in these gold deposits are rich in trace elements (Silva et al, 2018), the majority of which have high toxic potential. Past and present gold mining activities are considered important sources of trace elements that contaminate drinking water and soils (Borba et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Arsenic Contamination of Drinking Water: A Study of the Exposure to Residents From the Passagem De Mariana, A Historical Gold Mining Town in the Quadrilátero Ferrifero, Brazil

Mendes,

de Lena,

Abreu

et al. 2024

Preprint

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Human biomonitoring is one of the important tools for assessing exposure to toxic chemicals. A history of arsenic contamination via drinking water from gold mines in the Passagem district of Mariana, Brazil, is a way of incorporating this element into the body. This study aimed to evaluate water quality consumed by residents of Passagem de Mariana and to analyze biological samples, and investigate the magnitude of the exposure to arsenic. The results showed the presence of this trace element in higher concentrations than the maximum value permitted by the law. In two samples, concentrations were above 10 µg L− 1, regardless of the season, for two years. As for biological samples, arsenic concentrations in hair samples (0.048 to 0.925 µg g− 1) were lower than the normal level (< 1µg g− 1). Arsenic was quantified in urine, both in individuals in the exposed (9.80 to 211 µg L− 1) and in the reference group (8.20 to 55.7 µg L− 1), whose content is capable of affecting a degree of medium and high toxicological risk (> 15 µg L− 1). This group was affected by other sources contributing to arsenic exposure, making it necessary to study other environmental matrices as well as foods. After confirming the exposure, continued biomonitoring was recommended since the adverse effects caused by arsenic can be manifested in the long term.

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Section: Introductionmentioning

confidence: 99%

Arsenic Contamination of Drinking Water: A Study of the Exposure to Residents From the Passagem De Mariana, A Historical Gold Mining Town in the Quadrilátero Ferrifero, Brazil

Mendes,

de Lena,

Abreu

et al. 2024

Preprint

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“…In areas of high OM deposition, such as beneath oyster cages, hydrogen sulfide (H 2 S) can build up, subsequently inhibiting rates of nitrification and denitrification (21,22). In addition to these 4 elements (C, N, P and S), oyster mediated OM loading can also enhance the availability of heavy (such as Cu, Zn, and Pb: 23-25) and trace metals (such as As, Cd, Co, Cr, Fe, Mn, and Ni: 26,27), several of which are required in enzymes that perform microbial metabolism. For example, enzymes important for denitrification such as nitrate reductase, requires a molybdenum (Mo) protein cofactor for reducing nitrate to nitrite (28) and nitrous oxide reductase requires copper (Cu) for reducing nitrous oxide (N 2 O) to di-nitrogen (N 2 ) (29).…”

Section: Introductionmentioning

confidence: 99%

Oyster aquaculture enhances sediment microbial diversity– Insights from a multi-omics study

Stevens,

Ray,

Al-Haj

et al. 2023

Preprint

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The global aquaculture industry has grown substantially, with consequences for coastal ecology and biogeochemistry. Oyster aquaculture can alter the availability of resources for microbes that live in sediments as oysters move large quantities of organic material to the sediments via filter feeding, possibly leading to changes in the structure and function of sediment microbial communities. Here, we use a chronosequence approach to investigate the impacts of oyster farming on sediment microbial communities over 7 years of aquaculture activity in a temperate coastal system. We detected shifts in bacterial composition (16S rRNA amplicon sequencing), changes in gene expression (meta-transcriptomics), and variations in sediment elemental concentrations (sediment geochemistry) across different durations of oyster farming. Our results indicate that both the structure and function of bacterial communities vary between control (no oysters) and farm sites, with an overall increase in diversity and a shift towards anoxic tolerance in farm sites. However, little to no variation was observed in either structure or function with respect to farming duration suggesting these sediment microbial communities are resilient to change. We also did not find any significant impact of farming on heavy metal accumulation in the sediments. The minimal influence of long-term oyster farming on sediment bacterial function and biogeochemical processes as observed here can bear important consequences for establishing best practices for sustainable farming in these areas.ImportanceSediment microbial communities drive a range of important ecosystem processes such as nutrient recycling and filtration. Oysters are well-known ecological engineers, and their presence is increasing as aquaculture expands in coastal waters globally. Determining how oyster aquaculture impacts sediment microbial processes is key to understanding current and future estuarine biogeochemical processes. Here, we use a multi-omics approach to study the effect of different durations of oyster farming on the structure and function of bacteria and elemental accumulation in the farm sediments. Our results indicate an increase in the diversity of bacterial communities in the farm sites with no such increases observed for elemental concentrations. Further, these effects persist across multiple years of farming with an increase of anoxic tolerant bacteria at farm sites. The multi-omics approach used in this study can serve as a valuable tool to facilitate understanding of the environmental impacts of oyster aquaculture.

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“…In Brazil, the main high As concentrations occur in Minas Gerais state (Bundschuh et al, 2012), especially correlated to gold deposits in the Iron Quadrangle (Borba et al, 2003;Varejão et al, 2011;Costa et al, 2015;Silva et al, 2018) and in the surroundings the of city of Paracatu (Ono et al, 2012;Rezende et al, 2015;Bidone et al, 2018). In these regions the presence of As is associated with natural deposits of gold, where it is predominantly contained in sulfide minerals such as arsenopyrite and pyrite (Deschamps et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Arsenic quantification techniques and ISO/IEC 17025 accreditation in Brazil

Santos¹,

Busato²,

Heringer³

et al. 2019

Rev. Bras. Gest. Amb. Sustent.

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The importance of arsenic (As) quantification in environmental compartments is due to its risks to ecosystems and public health. There are reports of high concentrations of this metalloid in Brazil and technological differences between states are observed. The objective of this work was to present and discuss current scenarios of accreditation and compare the limit of quantification (LOQ) of As by analytical technique in Brazil. Data from accredited laboratories were collected on Inmetro website and in state metrological networks and then grouped and analyzed by state, matrix and analytical technique. There are large discrepancies between the number of laboratories per state and a good correlation with gross domestic product (GDP). Almost all laboratories have a LOQ less than the environmental limits. The observed list of techniques sorted from lowest to highest LOQ values is: for liquid samples ICP MS (inductively coupled plasma mass spectrometry), ET AAS (electrothermal atomic absorption spectrometry), HG AAS (hydride generation combined with atomic absorption spectrometry) or HG ICP OES (hydride generation combined with inductively coupled plasma optical emission spectrometry) and UV VIS (visible ultraviolet spectroscopy); for solids samples HG ICP OES, ICP MS, HG AAS, ET AAS and FAAS (flame atomic absorption spectrometry); and for bioindicators ICP MS, HG ICP OES. Analysis of As species is accredited in only one laboratory, but does not include all species.

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Arsenic and Trace Metals in Water and Sediment of the Velhas River, Southeastern Iron Quadrangle Region, Minas Gerais, Brazil

Cited by 9 publications

References 39 publications

Arsenic Contamination of Drinking Water: A Study of the Exposure to Residents From the Passagem De Mariana, A Historical Gold Mining Town in the Quadrilátero Ferrifero, Brazil

Arsenic Contamination of Drinking Water: A Study of the Exposure to Residents From the Passagem De Mariana, A Historical Gold Mining Town in the Quadrilátero Ferrifero, Brazil

Oyster aquaculture enhances sediment microbial diversity– Insights from a multi-omics study

Arsenic quantification techniques and ISO/IEC 17025 accreditation in Brazil

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