Extraction

Morrison, George H.; Freiser, Henry

doi:10.1021/ac50163a013

Cited by 27 publications

(5 citation statements)

References 39 publications

(41 reference statements)

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“…Heretofore, chromatography was limited to those separations where there was dynamic, reversible, selective sorption of the substances being separated. The extension of the term "chromatography" to periodic irreversible precipitations by various reagents or electrolysis (16,156, 157, 287) is not in accord with previous usage.…”

Section: Differential Migration An Analytic Disciplinementioning

confidence: 93%

Chromatography

Strain¹

1960

Anal. Chem.

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Section: Differential Migration An Analytic Disciplinementioning

confidence: 93%

Chromatography

Strain¹

1960

Anal. Chem.

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“…A double extraction utilizing sodium diethyldithiocarbamate and thenoyltrifluoroacetone was used in isolating magnesium from biological materials. The chelating abilities of the sodium salt of diethyldithiocarbamic acid and thenoyltrifluoroacetone (TTA) in analytical techniques are well documented as they have been utilized as reagents for colorimetric determinations for various elements (5)(6)(7)(8).…”

Section: Applicationsmentioning

confidence: 99%

Solvent Extraction and Determination of Magnesium Biological Materials.

Hahn¹,

Tuma²,

Quaife³

1967

Anal. Chem.

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plutonium-241, is only 4 X 10-5, the initial activity of the uranium is significant because of its short half-life of 6.75 days (7).Results for the alpha-gamma method showed a greater variation from the expected americium growth for two reasons. 65 64 103 96 218 214 242 228mended for extending the range to 0.2 ppm. This lower limit represents a count rate of about 100 counts/minute in 250 µg of typical plutonium, and is below the usual background of a gamma counter. Increasing the sensitivity of the method by employing much larger sample size enhances the hazard of spread of contamination during extraction and therefore is not recommended.

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“…Thus, two broad categories of metal complexes-chelates and ion association complexes-may be distinguished. These categories are utilized in the classification scheme outlined in Table I (7). The names ap plied to the systems are indicative of the reagents used to achieve complex formation.…”

Section: Classification Of Solvent Extraction Systemsmentioning

confidence: 99%

“…In addition to covering the principles and practical as pects of the technique, procedures for the extraction of the elements are presented. The review by the authors (7) in Analytical Chemistry surveys the latest developments in the field.…”

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confidence: 99%

Solvent Extraction in Radiochemical Separations

Freiser¹,

Morrison²

1959

Annu. Rev. Nucl. Sci.

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The last several years have seen a reawakening appreciation of the value of solvent extraction separations processes both on analytical and process scales. Separations by solvent extraction are simple, convenient, clean, and applicable equally well to carrier-free tracer and macro amounts of materials. They usually require apparatus as uncomplicated as a separatory funnel and may readily be adapted to remote handling procedures.A variety of separations techniques have been applied to the problems of isolation and radiochemical purification of nuclides. General descriptions and recent surveys of radiochemical separations can be found in references (1) through (5). Although all of the separation methods mentioned are of great importance to the radiochemist, solvent extraction is particularly well suited to the purification of many radioisotopes since, after several extractions of a substance, the final product is usually relatively free from extraneous im purities which may be present when other separation procedures are em ployed. Also, if the isotope of interest has a short half life, a rapid separation is essential and extraction procedures have proved invaluable. Most of the extractions employed in radiochemistry are based on previously developed conventional analytical extractions, and the recent book by the authors (6) offers a comprehensive treatment of the subject of extraction as applied to inorganic analysis. In addition to covering the principles and practical as pects of the technique, procedures for the extraction of the elements are presented. The review by the authors (7) in Analytical Chemistry surveys the latest developments in the field. CLASSIFICATION OF SOLVENT EXTRACTION SYSTEMSMost metal salts are strong electrolytes that are relatively insoluble in organic solvents and soluble in water because of its ability to solvate the ions as well as because of its high dielectric constant. Since it is usually necessary to transform the hydrated metal ion into an uncharged complex in order to extract it into an organic solvent, it is convenient to classify metal extraction systems on the basis of the nature of the extractable metal 1 The survey of literature pertaining to this review was completed in December, 1958.2 Among the abbreviations used in this chapter are: EDTA (ethylenediamine tetraacetic acid); HDGP (dioctylphenyl orthophosphoric acid); TBP (tributyl phos phate); TTA (thenoyltrifluoracetone).

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Extraction

Cited by 27 publications

References 39 publications

Chromatography

Chromatography

Solvent Extraction and Determination of Magnesium Biological Materials.

Solvent Extraction in Radiochemical Separations

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