Especiação analítica de compostos de arsênio empregando métodos voltamétricos e polarográficos: uma revisão comparativa de suas principais vantagens e aplicações

Carvalho, Leandro Machado de; Nascimento, Paulo Cı́cero do; Bohrer, Denise; Scharf, Mauro; Silva, Marcos Rivail da

doi:10.1590/s0100-40422004000200016

Cited by 11 publications

(4 citation statements)

References 79 publications

(135 reference statements)

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“…The toxicity of trivalent As is because it is retained in the body through the connection with sulfhydric groups (De Carvalho, 2004). In humans, doses between 10 and 50 μg.…”

Section: Introductionmentioning

confidence: 99%

Uroclhoa mosambincensis: A potential native phytoremediator for soils contaminated with arsenic

Sónia¹,

Marta²,

Edmilson³

et al. 2021

Afr. J. Environ. Sci. Technol.

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Industrial development has caused the contamination of the environment, leading to biodiversity loss and human health concerns. The use of native plants and/or their associated microbiota is a sustainable solution for reducing or transforming contaminants into less harmful forms. This study was conducted to evaluate the remedial potential of Uroclhoa mosambincensis in soils contaminated with arsenic. In a greenhouse experiment, seedlings of U. mosambincensis were divided into four treatments of increasing arsenic concentration. It was found out that in U. mosambicensis, although most physiological parameters were affected, in 200 mg.kg -1 arsenic trioxide concentration (As 2 O 3 ) an increase in 23.3% of leaf biomass was observed. Chlorophyll A was not significantly affected by the presence of arsenic. It was also verified that the increase in arsenic concentration stimulated the removal of arsenic from soil to plant tissues at a percentage of 10.8, 27.7 and 30.2 higher in each treatment. This indicates the arsenic accumulator character of U. mosambicensis and its potential use for remediation of soils contaminated with arsenic.

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“…The toxicity of trivalent As is because it is retained in the body through the connection with sulfhydric groups (De Carvalho, 2004). In humans, doses between 10 and 50 μg.…”

Section: Introductionmentioning

confidence: 99%

Uroclhoa mosambincensis: A potential native phytoremediator for soils contaminated with arsenic

Sónia¹,

Marta²,

Edmilson³

et al. 2021

Afr. J. Environ. Sci. Technol.

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“…Various reducing agents have been investigated for this reduction step including sulfite [12], hydrogensulfite [13], sulfur dioxide [14], hydrazine sulfate [15], hydroxylammonium chloride [16], potassium iodide [17], and ascorbic acid þ potassium iodide [18]. However, the reduction step is not simple due to the possible interference from an excess of reducing agent or the products of the reduction reaction [19]. Therefore, the choice and optimization of a reduction reaction that is compatible with the method employed is the most important aspect of arsenic speciation studies by voltammetric methods.…”

Section: Introductionmentioning

confidence: 99%

Redox Speciation of Inorganic Arsenic in Water and Saline Samples by Adsorptive Cathodic Stripping Voltammetry in the Presence of Sodium Diethyl Dithiocarbamate

et al. 2008

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This paper describes a new voltammetric procedure for the inorganic speciation of As(III) and As(V) in water samples. The procedure is based on the chemical reduction of arsenate [As(V)] to arsenite [As(III)] followed by the voltammetric determination of total arsenic as As(III) at the hanging mercury drop electrode (HMDE) by adsorptive cathodic stripping voltammetry (AdCSV) in the presence of sodium diethyl dithiocarbamate (SDDC). The reduction step involved the reaction with a mixture of Na 2 S 2 O 5 and Na 2 S 2 O 3 in the concentrations 2.5 and 0.5 mg mL À1 , respectively, and the sample heating at 80 8C for 45 min. The linear range for the determination of total arsenic as As(III) in the presence of SDDC was between 5 and 150 mg L À1 for a deposition time of 60 s (r ¼ 0.992). A detection limit of 1.05 mg L À1 for total As was calculated for the method in water samples using a deposition time of 60 s. The detection limits of 4.2 mg L À1 and 15.0 mg L À1 for total As in seawater and dialysis concentrates, respectively, were calculated using a deposition time of 60 s. The relative standard deviations calculated were 2.5 and 4.0% for five measurements of 20 mg L À1 As(V) as As(III) in water and dialysis concentrates, respectively, after chemical reduction under optimized conditions. The method was applied for the determination of As(III) and total As in samples of dialysis water, mineral water, seawater and dialysis concentrates. Recovery values between 86.0 and 104.0% for As(III) and As(V) added to the samples prove the satisfactory accuracy and applicability of the procedure for the arsenic monitoring.

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“…21,22 A more direct source of highly toxic As species has been observed in some types of algae containing inorganic arsenic as arsenate. 23,24 Although, arsenic speciation in different algae has been extensively developed in the past years, 8,[25][26][27][28][29][30][31][32][33] characterization of the As species has been exclusively studied in algae samples collected from sites with possible arsenic contamination from anthropogenic sources. Antarctica is still a relatively pristine continent, and it is a unique observation site to investigate global change phenomena that eventually will have an impact on more inhabited lands.…”

Section: Introductionmentioning

confidence: 99%

“…Since Antarctic algae can be considered as free of direct contamination from anthropogenic sources and due to the particular growing conditions imparted by the Antarctic environment, arsenic speciation in these samples could be different from other algae studied to date. Although, in the past, several publications have studied arsenic speciation in seaweed samples, 8,[25][26][27][28][29][30]35 to our knowledge no information on As species in Antarctic algae have been presented. In this work, an investigation of the arsenic species found in marine algae from the Antarctic region is presented.…”

Section: Introductionmentioning

confidence: 99%

Investigation of arsenic speciation in algae of the Antarctic region by HPLC-ICP-MS and HPLC-ESI-Ion Trap MS

Wuilloud

Altamirano

Smichowski

et al. 2006

J. Anal. At. Spectrom.

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An investigation into presence and nature of As species in algae originating from the Antarctic region is presented in this work. Arsenic speciation information in Antarctic algae samples was obtained by using anion-and cation-exchange chromatography with on-line detection by inductively coupled plasma spectrometry (ICP-MS) or electrospray ionization ion trap mass spectrometry (ESI-ITMS). Total arsenic concentrations found by ICP-MS in the Antarctic algae samples ranged from 8.4 to 29.3 mg As g À1 (dry weight). Arsenic species were efficiently extracted (83-108%) by using an MeOH : H 2 O (1 : 1) mixture. Anion-exchange chromatography utilizing gradient elution with 25 mM ammonium bicarbonate adjusted to pH 10 was used to separate the anionic As species present in the algae extracts. Additionally, gradient cation-exchange chromatography was performed using 4 mM pyridine solution adjusted to pH 2.4. This allowed the separation of neutral and cationic As species present in the algae extracts. High volatility of the mobile phases allowed sample introduction compatibility with both ICP-MS and ESI-ITMS detectors. Three arsenosugar species (arsenosugar-OH, -SO 3 , and -PO 4 ) previously reported in marine algae samples accounted for B50-80% of the total extractable arsenic in 4 of the 5 samples studied. In one algae sample, the presence of a previously unreported arsenic-containing compound in algae samples was confirmed by ESI-ITMS isolation and fragmentation as 5-dimethylarsinoyl-b-ribofuranose. This compound has been identified previously in marine bivalves but, to our knowledge, not in algae samples.

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Especiação analítica de compostos de arsênio empregando métodos voltamétricos e polarográficos: uma revisão comparativa de suas principais vantagens e aplicações

Cited by 11 publications

References 79 publications

Uroclhoa mosambincensis: A potential native phytoremediator for soils contaminated with arsenic

Uroclhoa mosambincensis: A potential native phytoremediator for soils contaminated with arsenic

Redox Speciation of Inorganic Arsenic in Water and Saline Samples by Adsorptive Cathodic Stripping Voltammetry in the Presence of Sodium Diethyl Dithiocarbamate

Investigation of arsenic speciation in algae of the Antarctic region by HPLC-ICP-MS and HPLC-ESI-Ion Trap MS

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