Speciation of chromium by in-capillary reaction and capillary electrophoresis with chemiluminescence detection

Yang, Weiping; Zhang, Zhujun; Deng, Wei

doi:10.1016/s0021-9673(03)00940-3

Cited by 47 publications

(19 citation statements)

References 27 publications

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“…The results are listed in to eliminate its interference. 33 On the other hand, the concentration of V 5+ in most water samples is lower than this level.…”

Section: Analytical Figures Of Meritmentioning

confidence: 90%

“…30 On the contrary, Cr(VI) is a toxic species and can easily penetrate the cell wall and exert its noxious influence on the cell, causing carcinogenic effects. Speciation of chromium often involves a separation step, such as ion exchange, electrophoresis, 33,34 nano-material micro-column separation, 35 and SPE. 36 Various methods can be used for subsequent determination, for instance, spectrophotometry, 28 atomic absorption spectrometry (AAS), 31,36 inductively coupled plasma atomic emission spectrometry (ICP-AES), 35 and inductively coupled plasma mass spectrometry (ICP-MS).…”

Section: Introductionmentioning

confidence: 99%

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Automation of Liquid–Liquid Extraction–Spectrophotometry Using Prolonged Pseudo-Liquid Drops and Handheld CCD for Speciation of Cr(VI) and Cr(III) in Water Samples

et al. 2005

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A simple spectrophotometric system, based on a prolonged pseudo-liquid drop device as an optical cell and a handheld charge coupled device (CCD) as a detector, was constructed for automatic liquid-liquid extraction and spectrophotometric speciation of trace Cr(VI) and Cr(III) in water samples. A tungsten halogen lamp was used as the light source, and a laboratory-constructed T-tube with two open ends was used to form the prolonged pseudo-liquid drop inside the tube. In the medium of perchloric acid solution, Cr(VI) reacted with 1,5-diphenylcarbazide (DPC); the formed complex was automatically extracted into n-pentanol, with a preconcentration ratio of about 5. The organic phase with extracted chromium complex was then pumped through the optical cell for absorbance measurement at 548 nm. Under optimal conditions, the calibration curve was linear in the range of 7.5 -350 µg L -1 , with a correlation coefficient of 0.9993. The limit of detection (3σ) was 7.5 µg L -1 . That Cr(III) species cannot react with DPC, but can be oxidized to Cr(VI) prior to determination, is the basis of the speciation analysis. The proposed speciation analysis was sensitive, yet simple, laboreffective, and cost-effective. It has been preliminarily applied for the speciation of Cr(VI) and Cr(III) in spiked river and tap water samples. It can also be used for other automatic liquid-liquid extraction-spectrophotometric determinations.

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“…The results are listed in to eliminate its interference. 33 On the other hand, the concentration of V 5+ in most water samples is lower than this level.…”

Section: Analytical Figures Of Meritmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Automation of Liquid–Liquid Extraction–Spectrophotometry Using Prolonged Pseudo-Liquid Drops and Handheld CCD for Speciation of Cr(VI) and Cr(III) in Water Samples

et al. 2005

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“…Luminol-based systems in CE can be a powerful tool to check the contamination level of water samples by metal ions due to the enhancement effect of some of them in this CL emission. H 2 O 2 was used as oxidant to determine chromium(III) (Cr 31 ) and chromium(VI) (CrO 2À 4 ) in tap, surface, well, river and wastewater samples allowing the chromium speciation [124,125]. This method was based on in-capillary reduction, i.e.…”

Section: Food and Environmental Applicationsmentioning

confidence: 99%

Advances and analytical applications in chemiluminescence coupled to capillary electrophoresis

2010

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Advances and analytical applications in chemiluminescence coupled to capillary electrophoresisThe present review presents the state of the art of the developments, key strategies and analytical applications of chemiluminescence detection coupled to CE (CE-CL). Different parts considering the most common CL systems have been included, such as the tris(2,2 0 -bipyridine)ruthenium(II) system, the luminol and derivatives reaction, the peroxyoxalate CL or direct oxidations. New advances in homemade configurations and applications in different fields such as clinical, pharmaceutical, environmental and food analysis have been included. The focus is on studies which appeared from 2000 to the end of 2009.

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“…The choice of reductant is very important for the Cr(VI) to be completely reduced to Cr(III). In order to quantitatively reduce Cr(VI) to Cr(III) H 2 O 2 in an acidic medium [15] [18,19] were used among the others. In most of the methods the reduction or oxidation step is carried out as a separate step outside the measuring system and it requires a relatively long time, which makes the whole measurement more complicated, longer and more exposed to accidental contamination.…”

mentioning

confidence: 99%

“…According to [18] HSO À 3 is an effective reducing agent for Cr(VI). The influence of NaHSO 3 on Cr(III) as well as Cr(VI) signals was studied and the results are presented in Figure 1.…”

mentioning

confidence: 99%

Catalytic Adsorptive Stripping Voltammetric Procedure for Determination of Total Chromium in Environmental Materials

2006

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A sensitive catalytic adsorptive stripping voltammetric procedure for determination of traces of total chromium in environmental samples is reported. The method is based on the preconcentration of a Cr(III)ÀH 2 DTPA complex by adsorption at the HMDE from an acetate buffer solution at the potential À 1.0 V vs. Ag/AgCl. Total chromium was determined as Cr(III) after reduction of Cr(VI) to Cr(III) by NaHSO 3 . In order to stabilize the signal of Cr(III) the measurements were performed at 5 8C. The calibration graph for chromium for an accumulation time of 60 s was linear in the range from 5 Â 10 À10 to 5 Â 10 À8 mol L À1 . The relative standard deviation for a chromium concentration of 1 Â 10 À8 mol L À1 was 3.9% (n ¼ 5). The detection limit for accumulation time of 60 s was about 8 Â 10 À11 mol L À1. The validation of the procedure was performed by the analysis of the certified reference materials.

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Speciation of chromium by in-capillary reaction and capillary electrophoresis with chemiluminescence detection

Cited by 47 publications

References 27 publications

Automation of Liquid–Liquid Extraction–Spectrophotometry Using Prolonged Pseudo-Liquid Drops and Handheld CCD for Speciation of Cr(VI) and Cr(III) in Water Samples

Automation of Liquid–Liquid Extraction–Spectrophotometry Using Prolonged Pseudo-Liquid Drops and Handheld CCD for Speciation of Cr(VI) and Cr(III) in Water Samples

Advances and analytical applications in chemiluminescence coupled to capillary electrophoresis

Catalytic Adsorptive Stripping Voltammetric Procedure for Determination of Total Chromium in Environmental Materials

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