Estudo da especiação de arsênio inorgânico e determinação de arsênio total no monitoramento ambiental da qualidade de águas subterrâneas

Borba, Ricardo Perobelli; Puga, Aline Peregrina; Figueiredo, Bernardino Ribeiro; Zambello, Fábio R.

doi:10.1590/s0100-40422009000400027

Cited by 8 publications

(7 citation statements)

References 14 publications

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“…Arsenate, arsenite and phosphate concentrations measured in this work are in the same range as previously reported for waters nearby the sampling site (Table 1); in all previous studies, the arsenite concentrations were very small (Borba et al 2003(Borba et al , 2004(Borba et al , 2009Pimentel et al 2003). …”

Section: Arsenic Concentration In Puddle Watersupporting

confidence: 89%

Arsenic in Biogenic Iron Minerals from a Contaminated Environment

Keim

2011

Geomicrobiology Journal

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High arsenic levels have been found in some water samples from the Iron Quadrangle, a main gold, manganese and iron mining region in Brazil. In this work, we used transmission electron microscopy coupled to energy-dispersive X-ray analysis to show arsenic in bacteriogenic iron minerals (BIOS) collected in this region. Two types of iron bacteria stalks and several morphologically different filamentous sheaths of bacteria were found, most containing arsenic. Bacterial stalks were partially coated by spherical precipitates probably deposited after stalk secretion. Arsenic/iron ratios were the same independently of the amount of spherical precipitates, suggesting that arsenic incorporation is independent of bacterial metabolism. Additionally, arsenic seems to be saturated in these minerals, since the arsenic/iron ratio was the same under different arsenic concentrations.

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Section: Arsenic Concentration In Puddle Watersupporting

confidence: 89%

Arsenic in Biogenic Iron Minerals from a Contaminated Environment

Keim

2011

Geomicrobiology Journal

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“…Voltammetric techniques are suitable for redox speciation and Nascimento et al 103 proposed a method for Se(IV) and Se(VI) determination in saline samples like seawater, hydrothermal and hemodialysis fluids. Borba et al 104 determined total and As species in groundwater based on the different rates of arsine formation. Duarte et al 105 developed a sensitive amperometric sensor for oxygen in pond and tap water with relative standard deviation of 2.0%.…”

Section: Environmentalmentioning

confidence: 99%

Analytical chemistry in Brazil: healthy and growing

Rocha

Pereira-Filho²,

Nóbrega³

2009

J. Braz. Chem. Soc.

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A química brasileira está crescendo rapidamente, sendo um dos principais alicerces para o contínuo desenvolvimento do país. Inspirados no 15º Encontro Nacional de Química Analítica, ENQA, com um número recorde de participantes e comunicações, decidiu-se revisar os recentes desenvolvimentos em química analítica no Brasil. Foram escolhidas as mesmas áreas de aplicação adotadas para a organização temática do ENQA e selecionados artigos publicados por autores brasileiros em 7 periódicos de ampla penetração na área. Os dois periódicos científicos editados pela Sociedade Brasileira de Química também foram pesquisados. Esta revisão não é exaustiva, porém os trabalhos selecionados após 2008 mostram uma significativa visão geral da área. Pode-se concluir que a química analítica brasileira está saudável, em crescimento e certamente atenderá as demandas do país como uma potência emergida.Chemical sciences in Brazil are growing fast and being one of the main supports for the continuous development of the country. Inspired on the 15 th Brazilian Meeting on Analytical Chemistry, ENQA, with a record number of participants and communications, we have decided to review recent developments in analytical chemistry in Brazil. We have chosen the same application areas used for the thematic organization of the ENQA and have searched papers published by Brazilian authors in 7 major and general journals in analytical chemistry. The two scientific journals published by the Brazilian Chemical Society were also searched. This review is not comprehensive, but the selected papers published after 2008 shown an impressive overview of the area. We may conclude that analytical chemistry is healthy and growing in Brazilian scenario and certainly will attend the demands of Brazil as an emerged power.

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“…In the environment, the toxicity of the metal depends on the oxidation state and the chemical structure of the metallic species. Arsenic exists in nature in a variety of chemical forms, including organic species such as monomethylarsonic acid (MMA), dimethylarsinic acid (DMA), arsenobetaine (AsB), and arsenocholine (AsC); and inorganic, the most toxic and formed by arsenate (As +5 ) and arsenite (As +3 ) It is worth mentioning that the inorganic compounds of As are about 100 times more toxic than the partially methylated organic forms (MMA and DMA, since the increasing order of toxicity of the As compounds, are: organic compounds of As 5+ < compounds organic of As 3+ < compounds inorganic of As 5+ < compounds inorganic of As 3+ (Borba et al 2009). A caveat must be made regarding DNA damage, where the trivalent methylated arsenic species, that is, MMA (III) and DMA (III), were considered more toxic than inorganic arsenic because they are more e cient in causing the breaking of DNA (Styblo et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Arsenic in Mining Area: Environmental Contamination Route

Hott¹,

Oliveira²,

Bomfeti³

et al. 2021

Preprint

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The emission of residues has contributed immensely to the fact that man is susceptible and exposed to toxic chemical products, among them, arsenic. One of the main anthropic sources of arsenic in the world is mining, which can contribute to the contamination of soil, water, air, and food. An example of environmental arsenic contamination in Brazil occurs in the city of Paracatu - MG, due to the operation of a gold mine. Thus, the objectives of this study were: (i) to assess the physical-chemical parameters and the concentration of arsenic in samples of superficial fresh water (sub-basin of the Paracatu River), and soil samples, during winter and summer; (ii) evaluate the arsenic concentration in samples of particulate matter; (iii) determine the concentration and species of As in biological samples and (iiii) evaluate the toxicity of surface waters using the Allium cepa test. There was no change in the physical-chemical parameters. The water samples collected during the winter and all soil samples showed values of As above those allowed by organs regulatory agencies. The values of As in the particulate material showed great variations between the regions under study but were within the limit established by the ATSDR for urban areas. Inorganic and organic As was found above the limit allowed in biological samples The analysis of water toxicity by the Allium cepa test indicated the presence of cytotoxic and genotoxic compounds, demonstrating a great risk for the population exposed to the waters of the Rico stream.

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Estudo da especiação de arsênio inorgânico e determinação de arsênio total no monitoramento ambiental da qualidade de águas subterrâneas

Cited by 8 publications

References 14 publications

Arsenic in Biogenic Iron Minerals from a Contaminated Environment

Arsenic in Biogenic Iron Minerals from a Contaminated Environment

Analytical chemistry in Brazil: healthy and growing

Arsenic in Mining Area: Environmental Contamination Route

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