Ion Exchange Separation of Zinc, Cadmium, and Mercury in Aqueous and Partial Nonaqueous Media

Berg, Eugene W.; Truemper, Joseph T.

doi:10.1021/ac60143a034

Cited by 29 publications

(5 citation statements)

References 8 publications

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“…In the separation of metal ions, non-aqueous solvents and anion exchange resin are reported to be more efficient than aqueous systems [25][26][27][28], In many cases, the presence of organic solvent causes metal ions to be adsorbed at lower acid concentrations. Distribution coefficients for these systems are considerably higher than for the more conventional acid/ aqueous systems.…”

Section: Resultsmentioning

confidence: 99%

Separation of ⁶⁴Cu from ⁶⁷Ga Waste Products Using Anion Exchange and Low Acid Aqueous/Organic Mixtures

1996

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M Cu / Anion exchange / Radionuclide / 61 Ga waste / Cyclotron / Radionuclide separation SummaryLow acid concentration aqueous/organic mixtures with an anion exchange resin (AG1-X8) have been used to separate carrierfree '"Cu from the by-products of cyclotron produced 67 Ga. The specific activity of the M Cu (5 X10 14 Bq/g) was found to be higher than that reported previously. Trace levels (<1%) of 67 Cu were also present. The new separation method is easier and faster (2 hours) than those currently employed in routine purification of both 67 Cu and "Cu production. We believe that the new method is the first reported use of organic solvents in the separation and purification of these radioisotopes and represents the first effort towards full characterisation of by-products for appropriate waste management.

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Section: Resultsmentioning

confidence: 99%

Separation of ⁶⁴Cu from ⁶⁷Ga Waste Products Using Anion Exchange and Low Acid Aqueous/Organic Mixtures

1996

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“…Unless some hours are allowed for equilibrium conditions, the anion exchange separation method will not be generally applicable. Even then Cd will interfere unless a different solvent system is used such as the use of CH3OH-H2O-HCI elution recently reported (6). All four separation procedures tested with radiozinc showed that 97 to 100% of the Zn is retained in the final Zn fraction and that these separations are truly efficient and not merely reproducible distributions with sizable loss of Zn.…”

Section: Ratio Of Impuritiesmentioning

confidence: 96%

“…Dithizone is now believed (17,23) to coordinate through one S and one N atom. For dithizone the complexes, and Zn(II) becoming more stable than Pb(II) (1)(2)(3)(4)(5)(6)(7)(8).…”

Section: Role Of Sulfur-coordinating Ligandsmentioning

confidence: 99%

Evaluation of Methods for Trace Zinc Determination

Margerum¹,

Sentacana²

1960

Anal. Chem.

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b Methods for determination of microgram quantities of zinc are experimentally evaluated. The preferred method uses bis(2-hydroxyethy1)dithiocarbamate (diethanoldithiocarbamate) masking with dithizone extraction and a single color method; 30 pg. of zinc are determined with an accuracy of 99.0 =t 1.8% (for duplicate samples with 95% confidence limits) in the presence of a tenfold excess of each of the following: cadmium, cobalt, copper, mercury, nickel, lead, iron, manganese, chromium, and tin. Because zinc is a common contaminator of reagents, the true efficiency of zinc separation procedures is proved with zinc-65. Radiozinc also elucidates the difference in behavior of diethyldithiocarbamate and diethanoldithiocarbamate as masking agents in dithizone extractions. The use of Zincon for zinc determinations is not recommended unless a limited number of impurities are present.HIS WORK compares and evaluates T methods for the determination of microgram quantities of zinc in the presence of an excess of a Ride range of metallic impurities. The chemical behavior of these methods is elucidated where helpful. The methods considered were limited to those adaptable to the determination of 1 to 100 pg. of Zn in solution with concentrations as low as 0.1 p.p.m. and to those with good accuracy (relative error less than 10%). Determinations without separations did not meet these limitations and the only suitable separations were dithizone extractions in the presence of various masking agents, anion elchange resin elution with hydrocliloric acid, and certain sulfide precipitations.Since Zn is a very common contaminator of reagents and of water, it is not knomn whether many separation procedures are truly efficient or if they merely give reproducible distribution of zinc in the various steps. For this reason several separation procedures have been tested with radiozinc to determine the total loss of Zn in a determination and to locate operations which might be particularly susceptible to error due t o incomplete separation.

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“…This resin was washed with hydrochloric acid to ensure complete conversion to the chloride form 10 and to remove iron impurity present in the commercial product. The hydrochloric acid concentration must be less than 2 mol L -1 to prevent the anionic iron-chloro complex formation which was adsorbed by the resin 11 . Also, the conditions to regenerate on-line the resin were studied, different concentrations of hydrochloric acid were tested between 0.1 to 0.5 mol L -1 , the optimum value was 0.2 mol L -1 .…”

Section: Preconcentration Systemmentioning

confidence: 99%

Automated flow-injection method for cadmium determination with pre-concentration and reagent preparation on-line

Nezio¹,

Palomeque²,

Band³

2005

Quím. Nova

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Ion Exchange Separation of Zinc, Cadmium, and Mercury in Aqueous and Partial Nonaqueous Media

Cited by 29 publications

References 8 publications

Separation of ⁶⁴Cu from ⁶⁷Ga Waste Products Using Anion Exchange and Low Acid Aqueous/Organic Mixtures

Separation of ⁶⁴Cu from ⁶⁷Ga Waste Products Using Anion Exchange and Low Acid Aqueous/Organic Mixtures

Evaluation of Methods for Trace Zinc Determination

Automated flow-injection method for cadmium determination with pre-concentration and reagent preparation on-line

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Ion Exchange Separation of Zinc, Cadmium, and Mercury in Aqueous and Partial Nonaqueous Media

Cited by 29 publications

References 8 publications

Separation of 64Cu from 67Ga Waste Products Using Anion Exchange and Low Acid Aqueous/Organic Mixtures

Separation of 64Cu from 67Ga Waste Products Using Anion Exchange and Low Acid Aqueous/Organic Mixtures

Evaluation of Methods for Trace Zinc Determination

Automated flow-injection method for cadmium determination with pre-concentration and reagent preparation on-line

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Separation of ⁶⁴Cu from ⁶⁷Ga Waste Products Using Anion Exchange and Low Acid Aqueous/Organic Mixtures

Separation of ⁶⁴Cu from ⁶⁷Ga Waste Products Using Anion Exchange and Low Acid Aqueous/Organic Mixtures