Speciation of Chromium(vi) and Chromium(iii) Using Pneumatically Assisted Electrospray Mass Spectrometry

Gwizdalaiii, Albin B.; Johnson, S. I.; Mollah, Sahana; Houk, R. S.

doi:10.1039/a606413b

Cited by 34 publications

(17 citation statements)

References 16 publications

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“…As shown in Fig.3, the chromium (III) (line A and B) was quantitatively collected at pH range of 3.0-3.5, whereas the anionic species of chromium (VI) was slightly retained on the resin (line C). , and it tends to be hydrolyzed at pH > 4, as the pKa of hydrolysis of Cr (III) is 3.85 (1,20,21), and eventually precipitated as Cr(OH) 3 . Therefore, the pH dependence of the Cr (III) collection on the iminodiacetate resin column at acidic region seems to be due to its low hydrolysis.…”

Section: Effect Of Ph On the Collection Of Chromium Speciesmentioning

confidence: 99%

“…Chromium (III) compounds are one of the essential trace nutrients in human bodies, and play an important role in the metabolism of glucose and certain lipids, whereas chromium (VI) compounds are toxic and carcinogenic [2][3][4]. The United State Environmental Protection Agency (USEPA) has regulated the permissible limit of 0.1 mg l −1 of total chromium in drinking water.…”

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confidence: 99%

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On-line preconcentration using dual mini-columns for the speciation of chromium(III) and chromium(VI) and its application to water samples as studied by inductively coupled plasma-atomic emission spectrometry

Sumida

Ikenoue

Hamada

et al. 2005

Talanta

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On-line preconcentration system for the selective, sensitive and simultaneous determination of chromium species was investigated. Dual mini-columns containing chelating resin were utilized for the speciation and preconcentration of Cr (III) and Cr (VI) in water samples. In this system, Cr (III) was collected on first column packed with iminodiacetate resin. Cr (VI) in the effluent from the first column was reduced to Cr (III), which was collected on the second column packed with iminodiacetate resin. Hydroxyammonium chloride was examined as a potential reducing agent for Cr (VI) to Cr (III).The effects of pH, sample flow rate, column length, and interfering ions on the recoveries of Cr (III) were carefully studied. Five milliliters of a sample solution was introduced into the system. The collected species were then sequentially washed by 1M ammonium acetate, eluted by 2M nitric acid and measured by ICP-AES. The detection limit for Cr (III) and Cr (VI) was 0.08 and 0.15 ųg l -1 , respectively. The total analysis time was about 9.4 min. The developed method was successfully applied to the speciation of chromium in river, tap water and wastewater samples with satisfied results.

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Section: Effect Of Ph On the Collection Of Chromium Speciesmentioning

confidence: 99%

mentioning

confidence: 99%

On-line preconcentration using dual mini-columns for the speciation of chromium(III) and chromium(VI) and its application to water samples as studied by inductively coupled plasma-atomic emission spectrometry

Sumida

Ikenoue

Hamada

et al. 2005

Talanta

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“…Ions are generated by ion-evaporation processes. Chromium has been speciated by ES-MS (Stewart and Horlick, 1996) and also by using pneumatically assisted electrospray mass spectrometry (Gwizdala et al, 1997). Microbore HPLC is also becoming more popular and has been used with ES-MS-MS (Pergantis et al, 1997).…”

Section: Hplc With Ms Detectorsmentioning

confidence: 99%

Hybrid Methods of Speciation

Greenway¹

2002

Chemical Speciation in the Environment

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“…Cr(III) is considered an essential trace element for the maintenance of an effective glucose, lipid, and protein metabolism in mammals [2]. On the other hand, Cr(VI) can be toxic for biological systems [3,4], and water soluble Cr(VI) is extremely irritating and toxic to human body tissue owing to its oxidizing potential and easy permeation of biological membranes [5,6]. Owing to the different toxicities of Cr(III) and Cr(VI), it is important to determine them separately, in addition to the total chromium content [7].…”

Section: Introductionmentioning

confidence: 99%

Speciation of chromium by selective separation and preconcentration of Cr(III) on an immobilized nanometer titanium dioxide microcolumn

2006

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Nanometer titanium dioxide immobilized on silica gel (immobilized nanometer-scale TiO2 particles) was prepared by a sol-gel method and characterized by X-ray diffraction and scanning electron microscopy. The adsorptive behavior of Cr(III) and Cr(VI) on immobilized nanometer TiO2 was assessed. Cr(III) was selectively sorbed on immobilized nanometer TiO2 in the pH range of 7-9, while Cr(VI) was found to remain in solution. A sensitive and selective method has been developed for the speciation of chromium in water samples using an immobilized nanometer TiO2 microcolumn and inductively coupled plasma atomic emission spectrometry. Under optimized conditions (pH 7.0, flow rate 2.0 mL/min), Cr(III) was retained on the column, then eluted with 0.5 mol/L HNO3 and determined by ICP-AES. Total chromium was determined after the reduction of Cr(VI) to Cr(III) by ascorbic acid. The adsorption capacity of immobilized nanometer TiO2 for Cr(III) was found to be 7.04 mg/g. The detection limit for Cr(III) was 0.22 ng/mL and the RSD was 3.5% (n = 11, c = 100 ng/ mL) with an enrichment factor of 50. The proposed method has been applied to the speciation of chromium in water samples with satisfactory results.

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Speciation of Chromium(vi) and Chromium(iii) Using Pneumatically Assisted Electrospray Mass Spectrometry

Cited by 34 publications

References 16 publications

On-line preconcentration using dual mini-columns for the speciation of chromium(III) and chromium(VI) and its application to water samples as studied by inductively coupled plasma-atomic emission spectrometry

On-line preconcentration using dual mini-columns for the speciation of chromium(III) and chromium(VI) and its application to water samples as studied by inductively coupled plasma-atomic emission spectrometry

Hybrid Methods of Speciation

Speciation of chromium by selective separation and preconcentration of Cr(III) on an immobilized nanometer titanium dioxide microcolumn

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