Complexometric determination of gallium with calcein blue as indicator

Elsheimer, H.N.

doi:10.1016/0039-9140(67)80051-1

Cited by 10 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

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

2007

View full text Add to dashboard Cite

show abstract

“…5 Strontium and barium ions were also titrated by EDTA, using Calcein Blue according to Elsheimer's method. 6 The selectivity coefficient was obtained by the following equation, where E, is the total ion exchange capacity (m eq), C (relative capacity), the volume of a cationic solution at the equilibrium point (m eq) and N, the amount of adsorbed cation (m eq) eluted by a 0.1 N HCl solution after being thorough washed with water. Though two kinds of equilibrium points were observed in the adsorption chromatography of calcium and magnesium ions, the last cations to be adsorbed disappeared as a result of a thorough washing with water or 0.1 M KCI: The exchange equilibrium between magnesium and calcium ions was measured by passing the calcium solution through the magnesium-bound CM-chitin layer at a flow rate of 0.6 ml min.…”

Section: Adsorption Chromatographymentioning

confidence: 99%

Studies on Chitin IX. Specific Binding of Calcium Ions by Carboxymethyl-Chitin

Tokura

Nishimura

Nishi

1983

Polym J

View full text Add to dashboard Cite

Carboxymethylation of chitin was carried out effectively for preparing a cation exchange resin under basic conditions. The resulting carboxymethyl-chitin (CM-chitin) was found to bind calcium ions specifically among alkali-earth metals even in the presence of monovalent cations such as sodium or potassium. Differential IR absorption spectroscopy suggested that the binding of calcium ion by carboxyl groups was assisted by acetamide groups at C2 and primary hydroxyl groups at C6 or secondary hydroxyl groups at C3 in the N-acetylglucosamine residue. The binding constants were estimated at various ionic strengths and ion concentrations. The selectivity coefficient of CM-chitin for calcium ions over sodium ions was assumed to be 45.6 at neutral pH and 0.1-{).2 of ionic strength. The fibrous CM-chitin was prepared to investigate the effects of an increase in the number of surface ionic sites and degree of orientation on the binding capacity. The results indicated a marked enhancement.

show abstract

“…Therefore, any Ga complex should be carefully checked for free Ga(III) ions before use. Various methods have already been proposed for the quantification of gallium ions in solution, such as spectrophotometry (7), fluorometry (8), complexometric titrations (9) or ICP-AES (10). As compared with the nondestructive NMR technique (11,12), those methods have the drawback that the measurement has to be carried out in acidic or strongly acidic media.…”

Section: Introductionmentioning

confidence: 99%

NMR determination of free gallium(III) ions in aqueous solutions of Ga complexes, “cold” analogs of PET/SPECT tracers

Zhou

Henoumont

Elst

et al. 2011

Contrast Media & Molecular

View full text Add to dashboard Cite

Ga complexes are widely used as radiopharmaceuticals for PET or SPECT imaging and as therapeutic agents. At physiological pH, free gallium(III) ions can stably exist as soluble gallate [Ga(OH)4]−, a nephrotoxic compound whose presence should be avoided. Any Ga complex, therefore, should be carefully checked for the absence of gallate before use. Here we show that 71Ga NMR is a useful tool to rapidly detect the presence of gallate in aqueous solutions of Ga complexes and to follow the purification steps of the Ga complex solutions. Copyright © 2011 John Wiley & Sons, Ltd.

show abstract

Complexometric determination of gallium with calcein blue as indicator

Cited by 10 publications

References 4 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

Studies on Chitin IX. Specific Binding of Calcium Ions by Carboxymethyl-Chitin

NMR determination of free gallium(III) ions in aqueous solutions of Ga complexes, “cold” analogs of PET/SPECT tracers

Contact Info

Product

Resources

About