Ultra-Trace-Level Determination of Cobalt, Chromium, and Hydrogen Peroxide by Luminol Chemiluminescence Detected with a Charge-Coupled Device

Jalkian, Rafi D.; Denton, M. Bonner

doi:10.1366/0003702884429931

Cited by 14 publications

(4 citation statements)

References 24 publications

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“…In a recent paper on luminol CL in unbuffered solutions with a cobalt(II)−ethanolamine complex, it would be worthwhile examining the possible role of CO 2 in addition to O 2 and N 2 gases. The role of CO 2 demonstrated in this work could explain the very low detection limits achieved with a batch apparatus, where the reagents and the sample are mixed in an open container enhancing gas exchange.…”

Section: Discussionmentioning

confidence: 92%

Carbon Dioxide Effects on Luminol and 1,10-Phenanthroline Chemiluminescence

et al. 2002

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Luminol and 1,10-phenanthroline are widely used chemiluminescent (CL) reagents for the analysis of a wide range of metals and inorganic and organic complexes. While the fundamental mechanism for luminol and 1,10-phenantholine chemiluminescence is understood, the analytical application of these reagents is largely empirical and often poorly described mechanistically. For example, CL signals observed from metal-luminol systems are strongly dependent on the pH of the sample, even though the final pH of the reaction mixture is controlled to a narrow range by a buffer. Other investigators report significant changes in CL signal due to freshness and the acidity of reagents. Our work shows that many of these effects are due to dissolved CO2 present or formed in the analytical system. The hypothesis that carbon dioxide plays a pivotal role in enhancing luminol CL is supported by direct manipulation of CO2(aq) concentrations by the addition of CO2(g) or carbonic anhydrase. In contrast, Cu(II) analysis using the CL reagent 1,10-phenanthroline is completely quenched in the presence of CO2(aq). A plausible mechanism for these observations involves the reaction between superoxide, produced in these analytical systems, and CO2(aq) to form the peroxycarbonate radical, *C04-. The formation of *CO4- has very important analytical implications since this species appears to enhance or quench the CL signal from luminol and 1,10-phenanthroline, respectively.

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Section: Discussionmentioning

confidence: 92%

Carbon Dioxide Effects on Luminol and 1,10-Phenanthroline Chemiluminescence

et al. 2002

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“…An approach using diphenylcarbazide colorimetry in tandem with the exchange resin Dowex 50W-X4 has also been proposed (25,26). Other less common approaches include isotope dilution (27), adsorptive differential-pulse voltammetry (28), luminol chemiluminescence (29), and cathodic stripping voltammetry (30). The discrepancies in the published results suggest that complete separation of Cr species is not always achieved using these various methods.…”

Section: Introductionmentioning

confidence: 99%

Chromium Speciation and Distribution in the Great Lakes

Beaubien¹,

Nriagu²,

Blowes³

et al. 1994

Environ. Sci. Technol.

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A technique is described for selectively measuring the forms of chromium in freshwater samples, with detection limits of 21 ng L-1 for Cr(III), 4 ng L-1 for Cr(VI), and 8 ng L-1 for colloidal/organic Cr. Recovery of the Cr(VI) and Cr(III) spikes were consistently >90%, but only about 70% for the added organic Cr. When the method was applied to samples from Lake Ontario, it was found that Cr(VI) made up 75-85% of the dissolved Cr and that Cr(III) was consistently below the analytical detection limit. About 10% of the dissolved Cr was in the colloidal/organic form. Average concentrations of total dissolved Cr in the epilimnetic waters were found to be 69 ng L-1 in Lake Superior, 136 ng L-1 in Lake Erie, and 351 ng L-1 in Lake Ontario. The increasing concentration of Cr down the Great Lakes watershed reflects the conservative geochemical behaviour of Cr(VI) and the increasing input of Cr from industrial and municipal sources

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“…Other papers employ intensity vs wavelength registers obtained from special devices (DDC) in order to determine an analyte [15,16] We validated our findings with a reference material …”

Section: Discussionmentioning

confidence: 54%

“…The simultaneous determination is achieved using wavelength discrimination or mathematical resolution [15,16]. The use of two different reactions have described for Co and Fe determination in the same manifold [17].…”

Section: Introductionmentioning

confidence: 99%

Multivariate calibration applied to simultaneous chemiluminescence determination of cobalt and chromium

et al. 2002

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The simultaneous determination of chromium and cobalt in water samples has been studied. Chemiluminescence registers based on the luminol-hydrogen peroxide reaction have obtained by a batch procedure. PLS algorithms have employed to model the time-response (formation and destruction of emitter). The influence of the presence of two metals and the non-linearity relationship between response and concentration have been evaluated in the signal. Different experimental designs and the selection of variables have been tested. The calibration set has been selected based on two criteria: unicomponent and/or bicomponent standard solutions and the slope calculated from linear univariate calibration. The response has been modelled providing high percentages of explained variance, robust models and low prediction errors. The proposed methodology has been validated using test standard solutions and a standard reference material of fresh water. Accurate results have proved the advantages of this method for the simultaneous determination of chromium and cobalt in water samples.

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Ultra-Trace-Level Determination of Cobalt, Chromium, and Hydrogen Peroxide by Luminol Chemiluminescence Detected with a Charge-Coupled Device

Cited by 14 publications

References 24 publications

Carbon Dioxide Effects on Luminol and 1,10-Phenanthroline Chemiluminescence

Carbon Dioxide Effects on Luminol and 1,10-Phenanthroline Chemiluminescence

Chromium Speciation and Distribution in the Great Lakes

Multivariate calibration applied to simultaneous chemiluminescence determination of cobalt and chromium

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