Uranin sensitized chemiluminescence for alternative determinations of copper(II) and free cyanide by the flow injection method

Wu, Xing Zheng; Hobo, Toshiyuki; Suzuki, Shigetaka

doi:10.1021/ac00189a009

Cited by 36 publications

(16 citation statements)

References 16 publications

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“…It is known that there are several maxima in the emission spectra of 1 O 2 , i.e. 1269, 762, 634, 476, and 381 nm [33,34]. Also, when no cotton was packed in the CL cell, 1,4-diazabicyclo [2,2,2,2,]octane (DABCO) and NaN 3 [35], well-known quenchers of 1 O 2 , were used in the present experiment.…”

Section: Spectrummentioning

confidence: 99%

Chemiluminescence study of carbonate and peroxynitrous acid and its application to the direct determination of nitrite based on solid surface enhancement

Lin

Huie

et al. 2004

Analytica Chimica Acta

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Peroxynitrous acid (ONOOH) was produced by the on-line mixing of acidified hydrogen peroxide with nitrite in a flow system. A strong chemiluminescent (CL) emission was observed when ONOOH reacted with carbonate without any special CL reagents. When cotton was present in the CL cell, the CL emission was enhanced significantly. The method was developed to determine nitrite, which showed a key improvement that any CL reagents and sensitizers were not used, resulting in better selectivity. The applicability of the present CL system was demonstrated for the sensitive and selective determination of nitrite in natural water samples without any special pretreatment. Good agreements were obtained for the determination of nitrite in tap and well waters between the present approach and a standard spectrophotometric method. The average precision was 4.6% (n = 7) and detection limit (S/N = 3) was 1.0 × 10 −7 M. Based on the CL spectrum, UV spectra, and dissolved oxygen measurement, a possible CL mechanism was proposed. ONOOH was an unstable compound in acidic solution and could be quenched into peroxynitrite (ONOO − ) in basic solution. ONOO − reacted with CO 2 to produce ONOOCO 2 − , which can rapidly decompose into• NO 2 and • CO 3 − radicals. In the presence of H + ,• CO 3 − radicals can protonate to bicarbonate radical (HCO 3 • ). The recombination of HCO 3• radicals and decomposition can lead to light emission.

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Section: Spectrummentioning

confidence: 99%

Chemiluminescence study of carbonate and peroxynitrous acid and its application to the direct determination of nitrite based on solid surface enhancement

Lin

Huie

et al. 2004

Analytica Chimica Acta

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“…There are many reports about the decomposition of peroxynitrite to form singlet oxygen ( 1 O 2 ) [6,19,20], which is the light-emitting species. It is known that there are several maxima in the emission spectra of 1 O 2 , i.e., 1269, 762, 634, 476, and 381 nm [21]. Two quenchers of 1 O 2 , 1,4-diazabicyclo [2,2,2,2]octane (DABCO), and NaN 3 [22] were used in the present experiment.…”

Section: And Fluorescent Spectramentioning

confidence: 99%

“…The decomposition energy of (CO 2 ) * 2 was calculated by the extended Hückel molecular orbital (EHMO) method and found to be 132 kcal/mol [26], which is high enough to excite uranine (55.5 kcal/mol) [21]:…”

Section: Mechanism From Carbonate-catalyzed Peroxynitrite Decomposmentioning

confidence: 99%

Carbonate-catalyzed chemiluminescence decomposition of peroxynitrite via (CO2)2∗ intermediate

Lin

2004

Catalysis Today

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Peroxynitrous acid (ONOOH) was formed by the on-line rapid reaction of acidified hydrogen peroxide with nitrite in a simple flow system. A weak chemiluminescent (CL) signal was observed due to the production of singlet oxygen ( 1 O 2 ) when ONOOH reacted with NaOH, whereas the replacement of NaOH by Na 2 CO 3 markedly enhanced the CL intensity. The predominant CL-enhanced pathway was achieved by the carbonate-catalyzed decomposition of peroxynitrite (ONOO − ). Carbonate species was regenerated in the process, that is, carbonate acts as a catalyst. Based on the studies of CL and fluorescence spectra, a possible CL mechanism from the reaction of carbonate with ONOOH was proposed. In brief, ONOOH was an unstable compound in acidic solution and could be quenched into ONOO − in basic media. It was suggested that ONOO − reaction with excess HCO 3 − proceeded via one-electron transfer to yield bicarbonate ion radicals (HCO 3 • ). The recombination of HCO 3 • may directly generate excited triplet dimers of two CO 2 molecules [(CO 2 ) * 2 ]. With the decomposition of this unstable intermediate to CO 2 , the energy was released by CL emission. The addition of uranine into carbonate solution caused enhancement of the CL signal, which was due to a part of excited triplet dimers of two CO 2 molecules energy to transfer to uranine, resulting in two CL peaks.

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“…Ma et al reviewed developments in cyanide detection between 2005 and April 2010. The interest in cyanide still is growing; many publications that cover almost all aspects of modern instrumental analysis have appeared, for example, spectrophotometry , electrochemistry , fluorimetry , chemiluminescence (CL) and chromatography .…”

Section: Introductionmentioning

confidence: 99%

Turn‐off–on chemiluminescence determination of cyanide

2014

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A flow injection chemiluminescence (FI-CL) method was developed for the determination of cyanide (CN(-) ) based on the recovered CL signal by Cu(2+) inhibiting a glutathione (GSH)-capped CdTe quantum dot (QD) and hydrogen peroxide system. In an alkaline medium, strong CL signals were observed from the reaction of CdTe QDs and H2O2 , and addition of Cu(2+) could cause significant CL inhibition of the CdTe QDs-H2O2 system. In the presence of CN(-) , Cu(2+) can be removed from the surface of CdTe QDs via the formation of particularly stable [Cu(CN)n ]((n-1)-) species, and the CL signal of the CdTe QDs-H2O2 system was efficiently recovered. Thus, the CL signals of CdTe QDs-H2O2 system were turned off and turned on by the addition of Cu(2+) and CN(-) , respectively. Further, the results showed that among the tested ions, only CN(-) could recover the CL signal, which suggested that the CdTe QDs-H2O2 -Cu(2+) CL system had highly selectivity for CN(-) . Under optimum conditions, the CL intensity and the concentration of CN(-) show a good linear relationship in the range 0.0-650.0 ng/mL (R(2) = 0.9996). The limit of detection for CN(-) was 6.0 ng/mL (3σ). This method has been applied to detect CN(-) in river water and industrial wastewater with satisfactory results.

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Uranin sensitized chemiluminescence for alternative determinations of copper(II) and free cyanide by the flow injection method

Cited by 36 publications

References 16 publications

Chemiluminescence study of carbonate and peroxynitrous acid and its application to the direct determination of nitrite based on solid surface enhancement

Chemiluminescence study of carbonate and peroxynitrous acid and its application to the direct determination of nitrite based on solid surface enhancement

Carbonate-catalyzed chemiluminescence decomposition of peroxynitrite via (CO2)2∗ intermediate

Turn‐off–on chemiluminescence determination of cyanide

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