Determination of Cr(vi) in water samples by ICP-OES after separation of Cr(iii) by montmorillonite

Frois, Sérgio Ribeiro; Grassi, Marco Tadeu; Campos, Mônica Soares de; Abate, Gilberto

doi:10.1039/c2ay26125a

Cited by 29 publications

(10 citation statements)

References 29 publications

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“…Aqueous solution was synthesized to simulate electroplating effluent in a hydrate-based experiment, using chromium chloride hexahydrate 38 , nickel sulfate hexahydrate 29 , zinc vitriol 26 , and copper sulfate pentahydrate 39 . Under atmospheric pressure at temperatures lower than 8.4 °C, hydrochlorofluorocarbon (HCFC) R141b (CH 3 -CCl 2 F) is known to form a structure-II hydrate consisting of a central organic molecule surrounded by 17 water molecules 40 ; it was selected as the hydrate former 41 42 43 in the present study because of its immiscibility with water, non-toxicity, and thermodynamic stability.…”

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confidence: 99%

Hydrate-based heavy metal separation from aqueous solution

Song

Dong

Yang

et al. 2016

Sci Rep

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A novel hydrate-based method is proposed for separating heavy metal ions from aqueous solution. We report the first batch of experiments and removal characteristics in this paper, the effectiveness and feasibility of which are verified by Raman spectroscopy analysis and cross-experiment. 88.01–90.82% of removal efficiencies for Cr3+, Cu2+, Ni2+, and Zn2+ were obtained. Further study showed that higher R141b–effluent volume ratio contributed to higher enrichment factor and yield of dissociated water, while lower R141b–effluent volume ratio resulted in higher removal efficiency. This study provides insights into low-energy, intensive treatment of wastewater.

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confidence: 99%

Hydrate-based heavy metal separation from aqueous solution

Song

Dong

Yang

et al. 2016

Sci Rep

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“…While Cr(III) is considered to be an essential micronutrient for humans, exposure to Cr(VI) compounds can cause damage to skin, respiratory tract and kidneys, and also increases risk of lung cancer. 5 Spectro-analytical methods such as FAAS, 6 ET-AAS, 7 ICP-OES 8 and ICP-MS 9 can detect the total chromium in water samples. However, these singular detection techniques suffer from low sensitivity and precision due to interferences in the sample matrix.…”

Section: Introductionmentioning

confidence: 99%

Chromium Speciation Using Flow-injection Preconcentration on Xylenol Orange Functionalized Amberlite XAD-16 and Determination in Industrial Water Samples by Flame Atomic Absorption Spectrometry

2015

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A speciation method for Cr(III) and Cr(VI) by on-line solid-phase extraction using a flow-injection system with FAAS has been proposed. The Cr(III) was selectively retained at pH 5 on the AXAD16-XO chelating resin and was eluted using 0.5 mol L -1 HNO3. The preconcentration factor and the detection limit (3σ) of 73 and 0.11 μg L -1 , respectively, were obtained for a 120-s preconcentration time. The precision (%RSD) at the 100 μg L -1 level was 1.08%. The linearity for Cr(III) measurements was up to 600 μg L -1 . The total chromium was determined by reducing Cr(VI) to Cr(III) using hydroxylamine hydrochloride, and the Cr(VI) concentration was obtained by subtraction from the total chromium concentration. The effect of interfering ions was examined towards the selectivity of the proposed system for Cr(III). Spike recovery studies in industrial water samples were carried out using standard Cr(III) and Cr(VI) solutions traceable to NIST. The proposed method was validated using SRM 1643e (Trace Elements in Water) supplied by NIST, USA.

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“…is based on the formation of a colored complex between Cr(VI) and 1,5-diphenylcarbazide (DPC) as given elsewhere in detail (50). This same approach was carried out in other studies (51). The results presented in Table V show that the developed method can be successfully employed for the selective determination of Cr(VI) in solutions containing both species of Cr.…”

Section: Analytical Application Of Proposed Spe Proceduresmentioning

confidence: 56%

Selective Determination of Cr(VI) by FAAS After Solid Phase Extraction on Bis(3-aminopropyl)amine-Bonded Silica Gel

Akyüz¹,

İmamoğlu²

2013

At.Spectrosc.

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In this study, a novel method was developed for the selective determination of Cr(VI) based on column solid phase extraction (SPE) using bis(3-aminopropyl) amine-bonded silica gel (BAPA-SG). To optimize the SPE procedure, the effects of various variables, including pH, sample volume, eluent type and volume, matrix ions and sample flow rate, were studied. The column SPE studies showed that BAPA-SG could selectively collect Cr(VI) ions at the pH of 2.0 from a sample volume up to 1000 mL in the presence of Cr(III). The recovery of the Cr(VI) ions was not affected by anions and cations widely found in environmental water samples. Adsorbed Cr(VI) on the column could be easily eluted using 5.0 mL of a 2.0M HCl solution. Cr(VI) adsorption dynamics onto BAPA-SG were also studied batch-wise by investigating the effects of contact time, initial Cr(VI) concentration, and temperature. Increasing the temperature showed adverse effects on the adsorption of Cr(VI). A Langmuir model best fit the experimental data. The maximum adsorption capacity was 75.5 mg g-1. The developed SPE procedure was successfully applied to the determination of Cr(VI) in spiked solutions by flame atomic absorption spectrometry. The pre-concentration factor of 200 permitted a detection limit of 0.11 ng/mL.

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Determination of Cr(vi) in water samples by ICP-OES after separation of Cr(iii) by montmorillonite

Cited by 29 publications

References 29 publications

Hydrate-based heavy metal separation from aqueous solution

Hydrate-based heavy metal separation from aqueous solution

Chromium Speciation Using Flow-injection Preconcentration on Xylenol Orange Functionalized Amberlite XAD-16 and Determination in Industrial Water Samples by Flame Atomic Absorption Spectrometry

Selective Determination of Cr(VI) by FAAS After Solid Phase Extraction on Bis(3-aminopropyl)amine-Bonded Silica Gel

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