Polarographic Determination of Technetium and Ruthenium Radionuclides in Fission Products

Love, D. L.; Greendale, A. E.

doi:10.1021/ac60163a014

Cited by 36 publications

(7 citation statements)

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“…The results show that the method proposed has advantages of high sensitivity, good selectivity, wide working range, accuracy, and simplicity. It is much more sensitive than polarographic methods reported earlier [1][2][3][4][5][6][7][8][9][10]. With respect to sensitivity, working range, and As( 111) amount…”

Section: Resultsmentioning

confidence: 99%

“…Because Ru content in the earth's shell is very low, it is important to develop a highly sensitive and selective polarographic method for the determination of Ru. Several polarographic methods have been reported for the determination of trace amounts of ruthenium [1][2][3][4][5][6][7][8][9][10]. Wangetal [3] have proposed a polarographic method for Ru with a detection limit of 5 X lo-' M. Recently, Medyantseva et al used a.c. polarographic method for determining Ru as low as 2.2 X lo-' M. However, detection limits less than ng/mL level have not been reported.…”

Section: Kltroductionmentioning

confidence: 99%

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A novel and highly sensitive single‐sweep oscillopolarographic method for the determination of ultratrace amounts of ruthenium

Jiang

1991

Electroanalysis

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A novel and highly sensitive oscillopolarographic method is described for determining ruthenium as low as 7.9 X lo-" M, based on its catalysis of the redox reaction between Ce(Iv) and As(II1). The changes in concentration of As(II1) in the reaction is traced by single-sweep oscillopolarography. The influence of 34 foreign ions is considered. Ruthenium in ore samples was analyzed by the method, and good results were obtained. . A thermometer has been used to determine 0.7-41 X g/mL Ru by measurement of the temperature rise in the Ce(IV)-As(II1) system [ 26). We have found that the reaction can be monitored by singlesweep oscillopolarography through the As(II1) wave at -0.65 V (vs. SCE). In the present work, a novel and highly sensitive method has been developed for the determining ultratrace amounts of Ru at levels higher than 7.9 x lo-" M. EXPERIMENTAL ApparatusA JP-2 model single-sweep oscillopolarograph (Chendu Instrumental Factory) was used for the polarographic measurements. The settings on the JP-2 single-sweep oscillopolarograph were: dropping mercury period 7 s; scanning rate 250 mV/s; scanning potential range 500 mV in the negative direction;I: (second derivative wave); and a three-electrode system-DME, SCE, and platinum electrode. An-5OlB model thermostat and a 10-mL thermostatic polarographic cell were used to control the reaction temperature. ReagentsA 100 pglmL As(II1) solution and 0.004 M Ce(N) solution containing 0.10 M H2SO4 were used.A standard solution of Ru (10 pg/mL) was prepared according to the following procedure: weigh out 16.45 mg of (NH,),Ru(H,0)C15 and place in a 250-mL beaker. Add 50 mg ferrous ammonium sulfate and 50 mL of 10 M H,S04 solution, heat until fumes have evolved for 5 min, cool, then transfer to a 500-mL volumetric flask and dilute to the mark with double distilled water. Prepare working solutions by dilution shortly before use. General ProcedureIn the polarographic cell, place 1.0 mL of 2.0 M H,SO,, 0.50 mL of 0.01 M mercuric sulfate and 0.20 mL of 100 pg/mLAs(III) solutions, and 8.0 X lo-" -4.0 X lo-* g Ru, then dilute to 9.0 mL with water. Keep the temperature of the cell at 25°C. After about 5 min add 1 . O mLof 0.004 M 0 1991 VCH Publishers, Inc.

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Section: Resultsmentioning

confidence: 99%

Section: Kltroductionmentioning

confidence: 99%

A novel and highly sensitive single‐sweep oscillopolarographic method for the determination of ultratrace amounts of ruthenium

Jiang

1991

Electroanalysis

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“…The method described by Love and Greendale has been modified for this determination [4]. The DPP polarogram (Fig.…”

Section: Comparison Of Polarographic and Radiometric Determinations Omentioning

confidence: 99%

Influence of technetium and rhenium speciation on their sorption on natural sorbents

1999

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Natural sorbents are mostly useful for retardation of the radionuclides. In this study, the possibility to apply the natural sorbents as carrier materials for radiopharmaceutical in vitro applications has been tested. The sorption experiments with technetium-99 have been carried out on bentonite R. The Kd values have been determined using the batch method. The results of the comparative study of the determination of the distribution coefficient by radiometric and polarographic methods are discussed from point of view of sorbed radionuclides speciation. The DPP polarografic reduction of ammonium pertechnetate and potassium perrhenate has been studied in aqueous solution with a variety of supporting electrolytes. The formation of the rhenium and technetium complexes as a function of the aqueous phase pH has been studied by the polarographic method.

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“…The reduction of Tc(VII) to Tc(IV) and the subsequent electrodeposition of TcO,. nH20 occurs in alkaline solutions in the presence of nitrate and nitrite (Love and Greendale 1960). The researchers assert that technetium(VI1) is reduced to metal from a 0.1 M NaOH and 1 .O M sodium citrate solution on a dropping mercury electrode at -1.55 V (measured versus the saturated calomel electrode).…”

Section: Electrodepositionmentioning

confidence: 99%

Decontamination of alkaline solution from technetium and other fission products and from some actinides by reductive coprecipitation and sorption on metals

Peretrukhin¹,

Silin²,

Тананаев³

et al. 1997

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SummaryEffective decontamination of alkaline solutions and Hanford Site tank waste simulants from technetium has been accomplished by reductive coprecipitation with iron(II1) hydroxide. Addition of 1 M (NH4),Fe(S04), to 0.5 to 4.0 M NaOH to a final concentration of 0.1 to 0.15 M coprecipitates more than 99% of the technetium from 0.5 to 1.0 &j NaOH and 98 to 96% from 2.0 to 4.0 M NaOH. Similar results were obtained by reduction of Tc(VII) with 0.1 to 0.15 &j hydrazine and subsequent addition of FeCI, to a final concentration of 0.15 M. Inclusion of four complex-fonning agents rO.01 &j phosphate, 0.1 M EDTA (ethylenediaminetetraacetate), 0.03 M citrate, and 0.1 M glycolate (HOCH,CO;)] to the alkaline solution decreases technetium coprecipitation with iron hydroxide to 85% under otherwise similar conditions. Inclusion of 0.04 M NqCrO, drastically decreases reductive coprecipitation of Tc(VII) in 0.5 to 4.0 M NaOH. Iron(I1) salt, added to a 0.07 M excess over that of chromate, completely reduces chromate and provides greater than 99% coprecipitation of technetium with product iron(II1) and chromium(II1) hydroxides. Technetium(VI1) reduction by hydrazine is slow in the presence of chromate in alkaline solution, and technetium coprecipitation is incomplete in these conditions. Decontamination of an alkaline Hanford Site tank waste simulant, containing 0.04 &j chromate and eleven salts and complex-forming agents, by adding 1 M iron(I1) salt solution was studied.Coprecipitation of 15 to 28% of the technetium and more than 99% of the plutonium occurred in the Fe/Cr(III) hydroxide precipitate produced by adding 0.05 to 0.10 _M iron@). Chromate reduction was incomplete. About 75% of the technetium was coprecipitated, and the chromate was completely reduced, after adding 0.2 _M iron@) salt.Technetium(VI1) capture from 0.5 to 4.0 M NaOH was insignificant or incomplete on coprecipitation carriers Pe(OH),, Cr(OH),, Mn(OH),, Co(OH),, Co(OH),J obtained by the Method of Appearing Reagents under conditions providing complete capture of Np(V) and Pu(V1). Under the same conditions, cesium-137 capture is insignificant and strontium-90 capture is incomplete with these metal hydroxide carriers. Sodium diuranate coprecipitation from 0.5 to 4 M NaOH removed about 15 to 60? -of the technetium; sodium uranate coprecipitation removed 98 to 99% of the 90Sr, and 1 to 12% of the l3'CS.Reductive sorption of Tc(VI1) on metals (Zn, Cry Sn, and two Pb alloys) from 0.5 to 4 M NaOH and from alkaline waste simulant provided poor decontamination of these solutions. In contrast, greater than 98% of the plutonium(V1) was sorbed on chromium from 0.5 M NaOH at a surface area to volume ratio of 1.6 cm-'.

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Polarographic Determination of Technetium and Ruthenium Radionuclides in Fission Products

Cited by 36 publications

References 9 publications

A novel and highly sensitive single‐sweep oscillopolarographic method for the determination of ultratrace amounts of ruthenium

A novel and highly sensitive single‐sweep oscillopolarographic method for the determination of ultratrace amounts of ruthenium

Influence of technetium and rhenium speciation on their sorption on natural sorbents

Decontamination of alkaline solution from technetium and other fission products and from some actinides by reductive coprecipitation and sorption on metals

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