Deviations from Plate Theory in the Ion–exchange Separation of Technetium and Rhenium

Sarma, Rajdeep; Anders, Edward; Miller, J.M.

doi:10.1021/j150574a027

Cited by 21 publications

(3 citation statements)

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“…Note (4). The principal remaining impurities at this point are Au (extracted as chloro-or bromoaurate) and…”

Section: Chromatographic Behavior Of Technetiummentioning

confidence: 99%

The Radiochemistry of Technetium

Anders¹

1960

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This series of monographs has grown out of the need for up-to-date compilations of radiochemical information and procedures. The Subcommittee has endeavored to present a series which will be of mELXimum use to the working scientist and which contains the latest available Information. Each monograph collects in one volume the pertinent information required for radiochemical work with an individual element or a group of closely related elements. An expert in the radiochemistry of the particular element has written the monograph, following a standard format developed by the Subcommittee. The Atomic Energy Commission has sponsored the printing of the series. The Subcommittee is confident these publications will be useful not only to the radlochemlst but also to the research worker in other fields such as physics, biochemistry or medicine who wishes to use radiochemical techniques to solve a specific problem.

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“…Note (4). The principal remaining impurities at this point are Au (extracted as chloro-or bromoaurate) and…”

Section: Chromatographic Behavior Of Technetiummentioning

confidence: 99%

The Radiochemistry of Technetium

Anders¹

1960

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“…Table I shows that before chlorination, the salt-splitting capacity is about 1 % lower than the total capacity for all resin samples, indicating that about 1% of the exchangeable groups on the unchlorinated resin are weak acid groups. The existence of weak acid groups on Dowex 50W strong acid cation exchanger and of weak base groups on Dowex 1 strong base anion exchanger has been inferred from tailing phenomena by Strelow (15) and by Sen Sarma, Anders, and Miller (14)• The weak acid groups on Dowex 50W are ones with pK"'s in the region 7 to 13, and are neutralizable only in rather strongly basic solution. Upon running 2.5M NaCl at pH's of 7.0 and 10.0 through unchlorinated Dowex 50W in the acid form, the effluent pH rose rather uniformly through the end of the pH region, indicating that a variety of weak acid groups is present, a conclusion which seems reasonable in view of the many different sites that are available for weak acid groups on the resin matrix.…”

Section: Formation Of Weak Acid Groups Upon Chlorinationmentioning

confidence: 99%

Use of Chlorine in Cation Exchange Separations

Blaedel¹,

Olsen²

1961

Anal. Chem.

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“…In the present study, types 4A and 5A molecular sieves, which have apertures with nominal diameters of 4 A and 5 A, respectively, were used. Methane and ethane are known to be taken up by both sieves while isobutane is excluded from both (19).…”

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confidence: 99%

Effects of micropores on peak shape and retention volume in gas-solid chromatography

Oberholtzer¹,

Rogers²

1969

Anal. Chem.

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A high-precision gas chromatograph has been used to study porosity effects by comparing the elution behavior of methane, ethane, and isobutane on 4A and 5A molecular sieves. Methane and ethane, which could enter the sieve crystallites, showed tailing independent of sample size. For the first time in gas chromatography, changes in retention volume were observed with changes in flow rate. Furthermore, methane and ethane showed a pronounced decrease in column efficiency with increasing temperature in the mass-transfer limited region rather than an increase. Those effects were attributed to slow diffusion within the zeolite because isobutane, which was excluded from the zeolite pores, did not show those effects.

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Deviations from Plate Theory in the Ion–exchange Separation of Technetium and Rhenium

Cited by 21 publications

References 0 publications

The Radiochemistry of Technetium

The Radiochemistry of Technetium

Use of Chlorine in Cation Exchange Separations

Effects of micropores on peak shape and retention volume in gas-solid chromatography

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