Speciation of chromium in mineral waters and salinas by solid-phase extraction and graphite furnace atomic absorption spectrometry

Chwastowska, J.; Skwara, W.; Sterlińska, E.; Pszonicki, L.

doi:10.1016/j.talanta.2005.01.055

Cited by 131 publications

(64 citation statements)

References 22 publications

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“…In Great Britain, the allowable concentration of chromium is limited to 15 mg L À 1 for surface waters (Chwastowska et al, 2005). The Brazilian environmental legislation (CONAMA, 2008) states that Cr(III) and Cr(VI) in final effluents should not exceed 1.0 mg L À 1 and 0.1 mg L À 1 , respectively.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous speciation of chromium by spectrophotometry and multicomponent analysis

Soares

Carneiroa

Monteiro

et al. 2009

Chemical Speciation & Bioavailability

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A simple, fast and sensitive spectrophotometric method for the simultaneous determination of Cr(III) and Cr(VI) in effluents and contaminated waters using a UV-visible spectrophotometer, which operates with an advanced software for multicomponent analysis, is proposed. The method consists in the complexation of Cr (III) with EDTA and reaction of Cr(VI) with diphenylcarbazide (DPC). Variables, such as pH and colour stability time, were studied. The effect of concomitant ions on the simultaneous Cr(III) and Cr(VI) determination was also investigated. The sums of the chromium species concentrations obtained by the proposed method were compared with the total chromium concentrations found by electrothermal atomic absorption spectrometry. Recoveries of the chromium species between 75 and 136% were obtained for spiked samples. The linear working range for Cr(III) was 0.5 -30 mg L

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Section: Introductionmentioning

confidence: 99%

Simultaneous speciation of chromium by spectrophotometry and multicomponent analysis

Soares

Carneiroa

Monteiro

et al. 2009

Chemical Speciation & Bioavailability

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“…Published methods of measuring Cr(VI) in environmental and water samples include colorimetry after the complexation of chromate ions with 1,5-diphenylcarbazide (DPC) or other molecules, with and without previous extraction and pre-concentration steps [14][15][16][17][18], and chromatographic techniques for the separation of different oxidation forms [19][20][21] and stripping voltammetry [22]. Furthermore, the website of the National Institute for Occupational Safety and Health (NIOSH) shows various protocols for determining Cr(VI) in environmental air [23], and a comparison of the different analytical methods [24].…”

Section: Introductionmentioning

confidence: 99%

Determination of hexavalent chromium in exhaled breath condensate and environmental air among chrome plating workers

Goldoni

Caglieri

Poli

et al. 2006

Analytica Chimica Acta

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Chromium speciation has attracted attention because of the different toxicity of Cr(III), which is considered relatively non-toxic, and Cr(VI), which can cross cell membranes mainly as a chromate anion and has been classified as a class I human carcinogen. The aims of the present study were to measure soluble Cr(VI) levels in environmental samples, to develop a simple method of quantifying Cr(VI) in exhaled breath condensate (EBC), and to follow the kinetics of EBC Cr(VI) in chrome plating workers.Personal air samples were collected from 10 chrome platers; EBC was collected from the same workers immediately after the work shift on Tuesday and before the work shift on the following Wednesday. Environmental and EBC Cr(VI) levels were determined by means of colorimetry and electrothermal absorption atomic spectrometry, respectively.The method of detecting Cr(VI) in environmental air was based on the extraction of the Cr(VI)-diphenylcarbazide (Cr(VI)-DPC) complex in 1-butanol, whereas EBC Cr(VI) was determined using a solvent extraction of Cr(VI) as an ion pair with tetrabutylammonium ion, and subsequent direct determination of the complex (Cr(VI)-DPC) in EBC.Kinetic data showed that airborne Cr(VI) was reduced by 50% in airway lining fluid sampled at the end of exposure and that there was a further 50% reduction after about 15 h. The persistence of Cr (VI) in EBC supports the use of EBC in assessing target tissue levels of Cr(VI).

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“…Among the instrumental techniques available, graphite furnace atomic absorption spectrometry (GF AAS) is still one of the most widely used for Cr determination in biological samples. 10,11 Particularly, AAS is a well--established analytical technique for chromium detection and speciation of Cr in biological materials using different approaches, such as selective volatilization as Cr(III)-thenoyltrifluoracetonate, 12 flow--injection on-line preconcentration on C18 mini-column, based on the selective formation of diethyldithiocarbanate complex of Cr(VI) in the 1-2 pH range and Cr(III) in the 4-9 pH range, 13 solid-phase extraction using ammonium pyrrolidinedithiocarbamate (APDC)-Cr(III) complex on Diaion HP-2MG resin, 14 Cr(III) extraction and preconcentration on silica gel chemically modified with Nb 2 O 5 15 and glass beads surface modified with 3-aminopropyl triethoxysilane (APTES) and glutaraldehyde for Cr(III)/Cr(VI) speciation in seawater. 16 Among the solid-phase extraction, silica organofunctionalized with APTES 17-21 and 3-(2-aminoethylamino) propyltrimethoxysilane (AAPTMS) 22 has been successfully used for separation and preconcentration of chromium species in different samples.…”

Section: Introductionmentioning

confidence: 99%

In vitro Cr(VI) speciation in synthetic saliva after releasing from orthodontic brackets using silica-aptes separation and GF AAS determination

et al. 2016

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A method for Cr(VI) speciation in synthetic saliva after releasing from orthodontic brackets, using silica nanoparticles organofunctionalized with (3-aminopropyl)triethoxysilane (APTES) for Cr(III)/Cr(VI) separation and GF AAS determination is proposed. Under the optimized conditions, Cr(VI) speciation was performed using 150 mg of silica organofunctionalized with 2.0% (v v -1 ) of APTES at pH 8. It was observed different sensitivity when calibrations of GF AAS were performed using Cr(III) or Cr(VI) as standard solutions. Consequently, calibrations using stoichiometric mixtures (Cr(III) + Cr(VI)) were used for total Cr determination and calibration using Cr(VI) was used only for the determination of this specie. The reliability of the proposed silica-APTES separation procedure and GF AAS determination was checked by addition of both species in synthetic saliva. Recoveries ranging from 97 to 110% were obtained. The repeatability, based on the relative standard deviation (RSD) inter days was less than 6%. A corrosion test was carried out on 20 orthodontic brackets from two different models, after immersion in synthetic saliva (pH=6.0) at 37 °C with agitation (125 rpm) for 24 h. It was observed that about 40% of the total chromium released from the analyzed orthodontic brackets was Cr(VI).

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Speciation of chromium in mineral waters and salinas by solid-phase extraction and graphite furnace atomic absorption spectrometry

Cited by 131 publications

References 22 publications

Simultaneous speciation of chromium by spectrophotometry and multicomponent analysis

Simultaneous speciation of chromium by spectrophotometry and multicomponent analysis

Determination of hexavalent chromium in exhaled breath condensate and environmental air among chrome plating workers

In vitro Cr(VI) speciation in synthetic saliva after releasing from orthodontic brackets using silica-aptes separation and GF AAS determination

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