extraction of arsenic

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The extraction of arsenic (As) species present in rice flour samples was investigated using different extracting solvents, and the concentration of each species was

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Jun 01, 2001  Arsenic of residual form was not extracted. The arsenic extractions abruptly increased by increasing phosphate concentration to 300 mM, attaining 35% extraction.

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Aug 01, 2015  PV plants after growing in soil containing 200 mg kg − 1 AsV were used to compare As extraction and speciation of four extraction methods. Total As concentrations in

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Extraction of arsenic - Hydrometallurgy: Leaching in Heap ...

The Extraction of Arsenic (V) and Sulphuric Acid From Acidic Sulphate Media by Tri-n-butyl Phosphate (TBP) in Shellsol A Or T: I - An Equilibrium Study of the

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Apr 01, 2019  However, the uptrend ceased after the sample was roasted for 90 min, where arsenic extraction almost reached 99% and further prolonging the time had brought little

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Mar 15, 2006  Different extraction procedures were applied to improve the extraction efficiency of arsenic compounds from lichens. Two lichen species were chosen from an

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Working methods: Complete extraction of arsenic species: a ...

Jul 31, 2003  Mesay M. Wolle, G.M. Mizanur Rahman, H.M. ‘Skip’ Kingston, Matt Pamuku, Speciation analysis of arsenic in prenatal and children's dietary supplements using

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The arsenic speciation of the biological samples was preserved using a Trypsin enzymatic extraction procedure. Extraction efficiencies were high, with values of

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The extraction of arsenic (V) from acidic copper sulphate electrolytes (e.g. refinery bleed streams) was investigated using various solvating, chelating and anion

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Aug 01, 2019  Liquid-liquid extraction of arsenic and H 2 SO 4 by undiluted TBP (97 vol-%) and mixture of 1,2-octanediol and 2-ethylhexanol was investigated experimentally for

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Chemical extraction of arsenic from contaminated soil ...

In this research, we investigated a chemical extraction process, under subcritical conditions, for arsenic (As)-contaminated soil in the vicinity of an abandoned smelting plant in South Korea. The total concentration of As in soil was 75.5 mg/kg, 68% of which was As(+III). X-ray photoelectron spectr

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Extraction techniques for arsenic species in rice flour ...

The extraction of arsenic (As) species present in rice flour samples was investigated using different extracting solvents, and the concentration of each species was determined by HPLC-ICP-MS after heat-assisted extraction. The extraction efficiencies for total arsenic species and especially for arse

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Extraction of arsenic(III) and arsenic(V) from natural ...

Extraction of Arsenic(III) with Macroporous Resin Impregnated with Bis(2-ethylhexyl)ammonium Bis(2-ethylhexyl)-dithiocarbamate.. Analytical Sciences 1998 , 14 (2) , 299-303.

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Extraction of arsenic species from spiked soils and ...

Jul 15, 2021  reduction reactions.6 Arsenic extraction and speciation in contami-nated soils is a topic of current interest.7–9One major difficulty is the extraction of arsenic from soils. Since arsenic compounds can be associated with the soil matrix to different degrees depending on a number of factors, any given solvent may not provide a sufficient ...

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New Approaches to the Extraction of Arsenic Species from ...

Oct 14, 2005  Arsenic extraction in natural and spiked soil samples was studied using two main types of extractants. The extractants were phosphoric acid used alone and with the addition of reducing agents (ascorbic acid and hydroxylammonium hydrochloride). The stability of arsenite (As(III)), arsenate (As(V)), monomethylarsonic acid (MMA) and dimethylarsinic acid (DMA) in the extracts over time and under ...

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Extraction Remediation Technologies of Arsenic ...

Arsenic extraction efficiency increases with the increasing of citric acid concentration, liquid soil ratio, and extraction time. When citric acid concentration is 0.25 mol/L, liquid-soil ratio was 20 mL/g, extraction time was 21 hours, arsenic extraction efficiency achieves the maximum 74.84%.

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Chemical Extraction of Arsenic from Contaminated Soil ...

Arsenic was extracted most efficiently by 5% H 3 PO 4 with a maximum of more than 99% from the model soil. Sulfuric acid also showed high percentage extraction efficiency. On the other hand, C 2 H 4 O 2 and oxidizing acids such as HNO 3 and HClO 4 showed low efficiency of As extraction compared with C 6 H 8 O 7. Although, NaOH also showed ...

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Arsenic Pyrite Gold Extraction by Alkaline Leaching Oxidation

Jul 22, 2017  The reason for the decrease in arsenic extraction at > 140 psig O2 pressure was not apparent. Lower oxygen pressure favored higher extraction of arsenic. The effect of percent solids on arsenic extraction using 106 pct of stoichiometric NaOH (2.0M)> 140 psig O2, 100° C, and 4 h is illustrated by the results from tests 8, 10, and 11.

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Comparison of mild extraction procedures for determination ...

Feb 14, 2005  Eight extraction agents (water, methanol–water mixtures in various ratios, methanol, a 20 mmol l−1 ammonium phosphate buffer, and a methanol–phosphate buffer) were tested for the extraction

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The toxicokinetic of arsenic in the edible and non-edible ...

20 小时前  The extraction efficiency of arsenic calculated as the percentage of the sum of speciated arsenic to the total arsenic (C Asspecies / C tAs) was in the range of 73 to 86% for the edible part and 64 to 97% for the non-edible part. Fig. 3 shows the proportion of arsenic species in the P. eximius samples from different sampling sites. The ...

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(PDF) The extraction of arsenic from copper electrolytes

The extraction of arsenic (V) from acidic copper sulphate electrolytes (e.g. refinery bleed streams) was investigated using various solvating, chelating and anion exchange extractants.

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Extraction of Arsenic(V) with Hexabutylphosphoric Triamide ...

The effects of the concentrations of sulfuric acid and arsenic in the aqueous phase, concentration of the extractant in the organic phase, temperature, and time of phase contact on arsenic(V) extraction with hexabutylphosphoric triamide were studied, and the arsenic(V) extraction constant was calculated.

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Extraction of adsorbed arsenic from IAEA-SOIL-5 Request PDF

The solvent extraction of arsenic from spent copper electrolyte by tri-n-butyl phosphate (TBP) was studied in order to develop a new process for purification of spent copper electrolyte. The paper ...

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Enhanced reductive extraction of arsenic from contaminated ...

Mar 02, 2015  Arsenic extraction was hindered by an excess of dithionite, and the optimum dithionite concentration was affected by the arsenic concentrations and the speciations present in the soils. Relatively high arsenic extraction could be obtained by a combination of dithionite and oxalate at a wide range of pH conditions.

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Chemical extraction of arsenic from contaminated soil ...

Oct 23, 2017  Arsenic species in the solution extracted at 300°C indicated that subcritical water oxidation may be involved in the dissolution of As(+III)-bearing minerals under given conditions. Our results suggest that subcritical water extraction/oxidation is a promising option for effective disposal of As-contaminated soil.

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Extraction of arsenic species from spiked soils and ...

Jul 15, 2021  reduction reactions.6 Arsenic extraction and speciation in contami-nated soils is a topic of current interest.7–9One major difficulty is the extraction of arsenic from soils. Since arsenic compounds can be associated with the soil matrix to different degrees depending on a number of factors, any given solvent may not provide a sufficient ...

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Extraction Remediation Technologies of Arsenic ...

Arsenic extraction efficiency increases with the increasing of citric acid concentration, liquid soil ratio, and extraction time. When citric acid concentration is 0.25 mol/L, liquid-soil ratio was 20 mL/g, extraction time was 21 hours, arsenic extraction efficiency achieves the maximum 74.84%.

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Extraction of Arsenic(V) with Hexabutylphosphoric Triamide ...

The effects of the concentrations of sulfuric acid and arsenic in the aqueous phase, concentration of the extractant in the organic phase, temperature, and time of phase contact on arsenic(V) extraction with hexabutylphosphoric triamide were studied, and the arsenic(V) extraction constant was calculated.

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Extraction of Arsenic(V) with Hexabutylphosphoric Triamide

Download Citation Extraction of Arsenic(V) with Hexabutylphosphoric Triamide The effects of the concentrations of sulfuric acid and arsenic in the aqueous phase, concentration of the ...

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(PDF) Extraction of arsenic(III) and arsenic(V) with ...

Arsenic Extraction of arsenic(III) and arsenic(V) were car- was stripped from the organic phase by mixing with ried out using equal volumes of both phases (20 mL the same volume of distilled water at 50 °C under each) at 50 °C under vigorous mixing (1000 min

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Enzyme-assisted extraction and liquid chromatography mass ...

Aug 12, 2015  We compared the extraction of arsenic species using several proteolytic enzymes: bromelain, papain, pepsin, proteinase K, and trypsin. With the use of papain-assisted extraction, 10 arsenic species were extracted and detected, as compared to 8 detectable arsenic species in the water/methanol extract.

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Development of a rapid extraction procedure for speciation ...

Mar 21, 2006  A rapid extraction procedure has been developed for speciation of arsenic in chicken tissue. Water, methanol–water (1:1), and methanol–chloroform (1:1) were tested as extraction media. Individual use of an ultrasonic bath, a microwave oven, or an ultrasonic probe was not sufficient for quantitative recovery of As(III), dimethylarsinate, monomethylarsonate, As(V), and arsenobetaine in ...

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Comparison of mild extraction procedures for determination ...

Feb 14, 2005  Eight extraction agents (water, methanol–water mixtures in various ratios, methanol, a 20 mmol l−1 ammonium phosphate buffer, and a methanol–phosphate buffer) were tested for the extraction

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The toxicokinetic of arsenic in the edible and non-edible ...

20 小时前  The extraction efficiency of arsenic calculated as the percentage of the sum of speciated arsenic to the total arsenic (C Asspecies / C tAs) was in the range of 73 to 86% for the edible part and 64 to 97% for the non-edible part. Fig. 3 shows the proportion of arsenic species in the P. eximius samples from different sampling sites. The ...

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The Determination of Arsenic Compounds: A Critical Review

A large number of publications describe the determination of arsenic in “environmental” samples in the broadest sense, a substantial subset of which focus on plant-based foodstuffs. There is a considerable interest in the inorganic arsenic content of food, especially rice, as there is recent evidence that concentrations may be high enough to exceed acceptable risk thresholds.

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Arsenic species extraction of biological marine samples ...

Jan 15, 2012  Arsenic species extraction of biological marine samples (Periwinkles, Littorina littorea) from a highly contaminated site. Whaley-Martin KJ(1), Koch I, Reimer KJ. Author information: (1)Royal Military College of Canada, Department of Chemistry and Chemical Engineering, PO Box 17000, Station Forces, Kingston, Ontario, Canada.

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Selective Extraction of Antimony and Arsenic from ...

Dec 01, 2016  For instance, a decreasing trend is noted in the extraction of both antimony and arsenic when the amount of decopperization slime increased from 50 g/L to 200 g/L (Fig. 6c). On the other hand, Fig. 6 d shows an increasing trend in the extraction of the metals when the leaching time was prolonged.

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(PDF) Extraction of arsenic species in soils using ...

Extraction of arsenic species in soils using microwave-assisted extraction detected by ion chromatography coupled to inductively coupled plasma mass spectrometry. Download. Related Papers. A comparative study of the extractability of arsenic species from silverbeet and

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