Arsenic contamination assessment in Brazil – Past, present and future concerns: A historical and critical review

Teixeira, Mônica Cristina; Santos, Alcylane Caldeira; Fernandes, Carla Silva; Ng, J. C.

doi:10.1016/j.scitotenv.2020.138217

Cited by 66 publications

(33 citation statements)

References 66 publications

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“…The As distribution in the rocks in the region is strongly associated with the sulfidic gold ores. The IQ possesses approximately sixty mines, and, after more than 300 years of exploitation, it is presumably more than 390000 tons of arsenic wastes had been produced and discharged in the whole IQ area (Teixeira et al, 2020;Figueiredo et al, 2007). Within Ouro Preto and Mariana cities' urban perimeter, several underground mine galleries were dug and explored in ancient times.…”

Section: Introductionmentioning

confidence: 99%

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Developing a biosurfactant to attenuate arsenic contamination in mining tailings

Araújo

Silva

Teixeira

2021

Heliyon

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The present study aimed to investigate the ability of a microbial consortium to produce biosurfactant in the presence of two carbon sources and also to evaluate the efficiency of the cell-free supernatant cultures to mobilize As from naturally contaminated soil. Pseudomonas and Stenotrophomonas were the main microorganisms in the microbial consortium. The pH, the incubation time, the temperature, and the glucose and glycerol ratios in the culture medium are the main factors influencing biosurfactant production. The lowest surface tension, 30 mN.m À1 , and the higher emulsification index, 58%, were achieved at the optimum production conditions (OPC), i.e., pH 9.5, a 2.5 glucose/glycerol ratio, after three days of incubation at 25 C. The cell-free extracts containing biosurfactants were more efficient in mobilizing As than distilled water, CaCl 2 0.1 mol.L À1 ; saponin, 0.1%; or sodium dodecyl sulfate, 1% during a sequential soil-flushing procedure. The As mobilization using the supernatants containing biosurfactant was sensitive to pH. The use of OPC cell-free supernatant under alkaline conditions leads to the best-obtained results: 24.6% of As removal (678 mg.kg À1) during sequential extractions. The toxicity reduction of the column eluted solution from the first to the seventh cycle evaluated by the germination index (GI) and morphological structures of Allium cepa in the ecotoxicological assessment confirmed the efficiency of the proposed treatment. Allium cepa seeds and seedlings were sensitive in detecting As in soil and eluted solutions with short time responses to the contaminant. Seeds development increased gradually with arsenic removal. The germination index rose from 0 to 55% after soil decontamination through the proposed soil-flushing procedure.

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Section: Introductionmentioning

confidence: 99%

“…Mining tailings exposure to the air and humidity contributes to As release in the environment (Teixeira et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Developing a biosurfactant to attenuate arsenic contamination in mining tailings

Araújo

Silva

Teixeira

2021

Heliyon

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“…1 According to the statistics of the World Health Organization, 2 in addition to the catastrophic arsenic pollution in water in Bangladesh and India's Bangladesh region, the United States, Mexico, Chile and other countries still have high concentrations of arsenic in water. [3][4][5] Longterm exposure to low-dose local arsenic contamination has become one of the most prominent environmental problems domestically and abroad; 6 thus, the international standards for drinking water of arsenic have become stricter. 7 Current treatment technologies for arsenic-containing water mainly include precipitation, adsorption, ion exchange, neutralization oxidation, ion otation, electro-occulation, extraction, membrane separation and biological method, among others.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of arsenic from aqueous solution using a zero-valent iron material modified by the ionic liquid [Hmim]SbF₆

Zhao

et al. 2021

RSC Adv.

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“…The World Health Association has recommended a safe level of 10 µg/L as a guideline in drinking water [5]. Reports in several countries of Latin America have shown concentrations of arsenic in groundwater above this risk level [1,[6][7][8] and the distribution of arsenic in soils, sediments, vegetables and irrigation water has been recently reviewed in Colombia [9] and Brazil [10]. The presence of arsenic in soils and waters naturally may occur, although anthropogenic activities have been the main contributory factor to the environmental contamination by arsenic, soils naturally enriched by arsenic need more attention.…”

Section: Introductionmentioning

confidence: 99%

As3MT and GST Polymorphisms Influencing Arsenic Metabolism in Human Exposure to Drinking Groundwater

González-Martínez

Sánchez-Rodas

Varela

et al. 2020

IJMS

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The urinary arsenic metabolites may vary among individuals and the genetic factors have been reported to explain part of the variation. We assessed the influence of polymorphic variants of Arsenic-3-methyl-transferase and Glutathione-S-transferase on urinary arsenic metabolites. Twenty-two groundwater wells for human consumption from municipalities of Colombia were analyzed for assessed the exposure by lifetime average daily dose (LADD) (µg/kg bw/day). Surveys on 151 participants aged between 18 and 81 years old were applied to collect demographic information and other factors. In addition, genetic polymorphisms (GSTO2-rs156697, GSTP1-rs1695, As3MT-rs3740400, GSTT1 and GSTM1) were evaluated by real time and/or conventional PCR. Arsenic metabolites: AsIII, AsV, monomethylarsonic acid (MMA), and dimethylarsinic acid (DMA) were measured using HPLC-HG-AFS. The influence of polymorphic variants, LADD and other factors were tested using multivariate analyses. The median of total arsenic concentration in groundwater was of 33.3 μg/L and the median of LADD for the high exposure dose was 0.33 µg/kg bw/day. Univariate analyses among arsenic metabolites and genetic polymorphisms showed MMA concentrations higher in heterozygous and/or homozygous genotypes of As3MT compared to the wild-type genotype. Besides, DMA concentrations were lower in heterozygous and/or homozygous genotypes of GSTP1 compared to the wild-type genotype. Both DMA and MMA concentrations were higher in GSTM1-null genotypes compared to the active genotype. Multivariate analyses showed statistically significant association among interactions gene-gene and gene-covariates to modify the MMA and DMA excretion. Interactions between polymorphic variants As3MT*GSTM1 and GSTO2*GSTP1 could be potential modifiers of urinary excretion of arsenic and covariates as age, LADD, and alcohol consumption contribute to largely vary the arsenic individual metabolic capacity in exposed people.

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Arsenic contamination assessment in Brazil – Past, present and future concerns: A historical and critical review

Cited by 66 publications

References 66 publications

Developing a biosurfactant to attenuate arsenic contamination in mining tailings

Developing a biosurfactant to attenuate arsenic contamination in mining tailings

Adsorption of arsenic from aqueous solution using a zero-valent iron material modified by the ionic liquid [Hmim]SbF₆

As3MT and GST Polymorphisms Influencing Arsenic Metabolism in Human Exposure to Drinking Groundwater

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Arsenic contamination assessment in Brazil – Past, present and future concerns: A historical and critical review

Cited by 66 publications

References 66 publications

Developing a biosurfactant to attenuate arsenic contamination in mining tailings

Developing a biosurfactant to attenuate arsenic contamination in mining tailings

Adsorption of arsenic from aqueous solution using a zero-valent iron material modified by the ionic liquid [Hmim]SbF6

As3MT and GST Polymorphisms Influencing Arsenic Metabolism in Human Exposure to Drinking Groundwater

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Adsorption of arsenic from aqueous solution using a zero-valent iron material modified by the ionic liquid [Hmim]SbF₆