Spectrofluorimetric determination of submicrogram amounts of zirconium with Calcein Blue

Hems, R.; Kirkbright, G. F.; West, T.S.

doi:10.1021/ac60289a019

Cited by 8 publications

(2 citation statements)

References 9 publications

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“…According to these authors, it seems that the presence p-electrons in the ligand molecule favors the adsorption process. Calcien blue (4-methylumbelliferone-8-methyliminodiacetic acid) (CB) is a weakly acidic compound with different functional groups (with hard and soft nature ) and so can be coordinated to soft and hard metal ions such as Zr 4þ [29], Ln 3þ [30], Ag þ [31], Ga 3þ [32], Ca 2þ [33], Mg 2þ [34] and Fe 2þ [35] through donating groups depending on the pH of the solution. In this connection, the complexation of CB with Cu 2þ was tested by cyclic voltammetry.…”

Section: Resultsmentioning

confidence: 99%

Determination of Copper by Adsorptive Stripping Voltammetry in the Presence of Calcein Blue

2007

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An electrochemical adsorptive stripping approach is presented for the trace measurement of copper in some real samples. The method is based on the reduction of Cu 2þ at pH 5.5 calcein blue (CB) containing solution at À 250 mV (vs. Ag/AgCl), adsorption of CuÀCB complex on hanging mercury drop electrode (HMDE) and the voltammetric determination by further reduction to Cu þ at HMDE. Experimental optimum conditions were determined in the fundamental studies. At the experimental optimum conditions the adsorbed complex of Cu 2þ and calcein blue gives a well defined cathodic stripping peak current at À 0.135 V, which has been used for the determination of copper in the concentration range of 0.02 to 15 ng/mL with accumulation time of 90 s. The relative standard deviation (RSD) for the determination of 0.5 and 6.0 ng mL À1 were 2.60 and 1.94% respectively. (n ¼ 10). The method has been applied to the analysis of copper in analytical reagent grade salts and tap water, mineral water and drug samples with satisfactory results.

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Section: Resultsmentioning

confidence: 99%

Determination of Copper by Adsorptive Stripping Voltammetry in the Presence of Calcein Blue

2007

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“…This deviation may be due to the existence of high background fluorescence from the metal chelate, which would make it difficult to measure any enhancement of the fluorescence by low concentrations of fluoride. This means that the assumption made in deriving equation (4) was not valid at this low fluoride concentration. The approximation used to derive equations ( 4) and ( 5 ) was valid for a restricted range of molarity.…”

Section: Determination Of the Conditional Formation Constantmentioning

confidence: 91%

Fibre optic fluorimetric determination of fluoride ions

Russell¹,

Narayanaswamy²

1989

Analyst

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The reaction between fluoride ions and a complex of calcein blue and zirconium, immobilised on a non-ionic exchange resin Amberlite XAD-4, has been studied with respect to the development of a fibre-optic based fluoride ion sensor. The fluorescence from this complex was enhanced in the presence of fluoride ions, which were detected using optical fibres with the immobilised reagent phase contained in a flow cell. The response to fluoride ions at pH 2.2 was linear in the range 0.1 1-0.42 mM (2-8 p.p.m.). The reversibility of the reaction has been investigated together with the effect of some foreign ions on the determination of fluoride ions.

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A ferrous ion optical sensor based on fluorescence quenching

Noiré

Dureault

1995

Sensors and Actuators B: Chemical

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Spectrofluorimetric determination of submicrogram amounts of zirconium with Calcein Blue

Abstract: Several reagents have been shown to provide sensitive methods for the spectrofluorimetric determination of zirconium. Flavanol (/), quercetin (2), and morin (3), where vicinal

Cited by 8 publications

References 9 publications

Determination of Copper by Adsorptive Stripping Voltammetry in the Presence of Calcein Blue

Determination of Copper by Adsorptive Stripping Voltammetry in the Presence of Calcein Blue

Fibre optic fluorimetric determination of fluoride ions

A ferrous ion optical sensor based on fluorescence quenching

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