Applications of Electrophoresis to the Study of the Complexation of Cadmium with Humic Substances Using <sup>109</sup>Cd as Radiotracer

Beneš, P.; Mizera, Jiří

doi:10.1524/ract.1996.74.special-issue.185

Cited by 6 publications

(1 citation statement)

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“…Few attempts have yet been done to obtain information on the nature from the study of electromigration of the charged metal/HS species. Although numerous complexation studies using the electromigration method appeared several decades ago [1], its application to study complexation behavior of HS is still rare [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Radiotracer study of the electrophoretic behavior of Eu and its complexes with humic acid

Mizera¹,

Dolanský²,

Beneš³

2001

Radiochimica Acta

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Humic acid / Europium / Radiotracer method / Electrophoresis / ComplexationSummary. The interaction of Eu with purified/protonized Aldrich humic acid (HA) was studied by the free liquid/ moving boundary electrophoresis used in combination with the radiotracer method. Introductory experiments were carried out to test electrophoretic behavior of Eu in HA-free solutions, and to determine mobility of Eu 3+ cation. To get the data for evaluation of parameters describing Eu binding to HA, titrations of HA (10 mg/L) with Eu were performed batchwise in the range 3.4 × 10 −8 -1.7 × 10 −3 M of Eu total concentration at pH 3, 4, 5 and 6, and 0.01 M ionic strength (NaClO 4 ). In each batch, the degree of Eu complexation with HA was determined from 152 Eu electrophoretic mobilities in the cathodic direction. The experimental data were fitted with a discrete site model (Scatchard plot-like model) with two types of carboxylic sites. An additional information on the charge characteristics of the Eu-HA complexes has been obtained from the 152 Eu anodic mobilities.

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Section: Introductionmentioning

confidence: 99%

Radiotracer study of the electrophoretic behavior of Eu and its complexes with humic acid

Mizera¹,

Dolanský²,

Beneš³

2001

Radiochimica Acta

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Radiotracer analysis of cadmium speciation in soil solutions using electrophoresis, dialysis, centrifugation, and ultrafiltration

Beneš

Mizera

1999

Biol Trace Elem Res

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Speciation of carrier-free 109Cd, added in cationic form to pre-filtered extracts obtained by leaching forest soil samples with distilled water, was analyzed using electrophoresis, dialysis, centrifugation, and ultrafiltration. Rapid establishment of isotopic equilibrium between the added 109Cd and stable cadmium present in the extracts was observed. All the data obtained indicated that 109Cd and also stable cadmium were present in the analyzed extracts in the form of neutral or negatively charged organic complexes or small colloids. The results of electrophoresis enabled the characterization, at least semiquantitative, of the abundance and electrophoretic mobility of the forms present. The incomplete dialysis of 109Cd from the soil extracts through cellophane membrane against water proved the presence of organic associates with molecular weights higher than 10(4). Dialysis against the same, but unlabeled extract was always complete, indicating the reversible (labile) nature of the organic forms of cadmium. Assessment of the stability constants of the organic forms using a simple discrete two-site model suggested that humate and/or fulvate complexes of cadmium were formed.

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Migration and sorption of 137Cs and 152,154Eu in crushed crystalline rocks under dynamic conditions

Palágyi

Vodičková

Landa

et al. 2009

J Radioanal Nucl Chem

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Applications of Electrophoresis to the Study of the Complexation of Cadmium with Humic Substances Using ¹⁰⁹Cd as Radiotracer

Cited by 6 publications

References 5 publications

Radiotracer study of the electrophoretic behavior of Eu and its complexes with humic acid

Radiotracer study of the electrophoretic behavior of Eu and its complexes with humic acid

Radiotracer analysis of cadmium speciation in soil solutions using electrophoresis, dialysis, centrifugation, and ultrafiltration

Migration and sorption of 137Cs and 152,154Eu in crushed crystalline rocks under dynamic conditions

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Applications of Electrophoresis to the Study of the Complexation of Cadmium with Humic Substances Using 109Cd as Radiotracer

Cited by 6 publications

References 5 publications

Radiotracer study of the electrophoretic behavior of Eu and its complexes with humic acid

Radiotracer study of the electrophoretic behavior of Eu and its complexes with humic acid

Radiotracer analysis of cadmium speciation in soil solutions using electrophoresis, dialysis, centrifugation, and ultrafiltration

Migration and sorption of 137Cs and 152,154Eu in crushed crystalline rocks under dynamic conditions

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Applications of Electrophoresis to the Study of the Complexation of Cadmium with Humic Substances Using ¹⁰⁹Cd as Radiotracer