researcharticle radiochemicalstudiesontheseparationof ... · journalofchemistry 3 0.01 0.1 1 10 0.1...

Hindawi Publishing CorporationJournal of ChemistryVolume 2013 Article ID 756876 5 pageshttpdxdoiorg1011552013756876

Research ArticleRadiochemical Studies on the Separation ofCesium Cobalt and Europium from Aqueous Solutions UsingZirconium Selenomolybdate Sorbent

H El-Said

Radioactive Isotopes and Generators Department Hot Laboratories Center Atomic Energy Authority Cairo 13759 Egypt

Correspondence should be addressed to H El-Said hassanlsdyahoocom

Received 9 June 2012 Accepted 27 July 2012

Academic Editor Yoshihiro Kudo

Copyright copy 2013 H El-Said is is an open access article distributed under the Creative Commons Attribution License whichpermits unrestricted use distribution and reproduction in any medium provided the original work is properly cited

A procedure for removal and separation of Cs Eu and activation product of Co using zirconium selenomolybdate was developedInteractions of 134Cs(I) 152154Eu(III) and 60Co(II) ions from HNO3 acid solutions with zirconium selenomolybdate matrix driedat 50∘C have been individually investigated by the batch equilibration method e sorption behavior of the three ions showed aselectivity sequence in the following order Cs(I) gt Eu(III) gt Co(II) e breakthrough capacities of zirconium selenomolybdatefor Cs(I) Eu(III) and Co(II) were found to be 082 045 and 018mmolg of the sorbent respectively A mixture of the threeradionuclides (1 times 10minus2M each) in 140mL of 1 times 10minus2M HNO3 solution was passed through 1 g zirconium selenomolybdatechromatographic columnereaer quantitative elution of the retained Co(II) was achieved with 14mL of 1times10minus1MHNO3 acidsolution leaving Eu(III) and Cs(I) strongly retained onto the column Quantitative elution of Eu(III) was achieved by passing 22mL25 times 10minus1MHNO3 About 89 of the retained Cs(I) was eluted with 32mL of 2M NH4Cl solution at a ow rate of 05mLmin

1 Introduction

Synthetic inorganic sorbents have many advantages overorganic ones ese advantages include high selectivity toions of some elements of potential benets rapid rate ofuptake stability towards high temperature and ionizingradiation doses and acidic and moderately alkaline media[1 2] In addition they have the ability to be converted intounleachable glass or ceramic form ere are a wide varietyof inorganic sorbents utilized successfully for treatment oflarge volume of nuclear waste effluents to separate andconcentrate the radionuclides in small volume before buryingand disposal of the treated liquid aquatic system andorrecovery of some valuable radionuclides for reuse in differentapplications [3ndash14] In addition inorganic ion exchangerscan be used for treatment of industrial effluents to removesome toxic heavy metals which are frequently found in theseeffluents [15ndash21] e proper choice is limited to a numberof factors such as chemical composition of the mediumreactivity of the radionuclides present and in turn selectivityof the sorbent solution concentration pH and temperature

Heteropolyacids and salts have found versatile radio-chemical separation of mixture of radioisotopes from eachother and of ssion products parentdaughter isobars sep-aration onto chromatographic columns in the form ofradioisotope generators and immobilization of exhaustedradiowaste onto installed trapsHeteropolyacid sorbents suchas 12-molybdocerate zirconium-selenomolybdate and 12-tungstocerate have promising surface adsorption reactionswith different metal ions in solution such as Cs Ba Co EuZn Cd Pb Sn In and Ag [14 22 23] eir chemical andradiation stability are suitable for their introduction in theeld of chromatographic applications

e three radioisotopes 137Cs 152154Eu and 60Co areimportant long-lived products in the nuclear waste 137Cs is assion product 60Co is an activation product and 152154Euis ssion and neutron activation product e removal ofthese radioisotopes decrease the radiation level of the wasteIn addition the recovery of some valuable radionuclide suchas 137Cs for reuse in different applications by preparationof 137Cs137mBa radioisotope generator which is used in

2 Journal of Chemistry

medicine and industry in quality control process 152154Euand 60Co are used for producing sealed sources which areused in medicine and industry

e present work aims at (i) preparation of zirconi-um(IV) selenomolybdate (ii) determination of batch distri-bution coefficients of 134Cs(I) 152154Eu and 60Co(II) fromHNO3 solutions individually on zirconium(IV) selenomo-lybdate matrix (iii) determination of the breakthroughcapacities of zirconium(IV) selenomolybdatematrix for theseions and (iv) separation of these radionuclides from eachother by loading their mixture solution in HNO3 onto achromatographic column of the matrix and eluting themsubsequently with HNO3 solutions andor other solutions ofdifferent concentrations

2 Experimental

All chemicals were of A R grade Distilled water was usedfor different solution preparations and washing Radiometricidentication and measurements were made by using amultichannel analyzer (MCA) of ldquoInspector 2000rdquo modelCanberra Series made in USA coupled with a high-puritygermanium coaxial detector (HPGe) of ldquoGX2518rdquo model

21 Radiotracers of 134Cs 152154Eu and 60Co Radionuclidesof 134Cs and 60Co were produced by thermal neutron irra-diation of CsCl and CoCl2 target materials in the water-cooled ETRR-2 Research Reactor (Egypt) for 4 h at a ther-mal neutron ux of 1 times 1014 n cmminus2 sminus1 Radionuclides of152154Eu were produced by thermal neutron irradiation ofEu2O3 target materials in the water-cooled ETRR-1 ResearchReactor (Egypt) for 48 h at a thermal neutron ux of 1 times1013 n cmminus2 sminus1

22 Preparation of Zirconium Selenomolybdate Zirconiumselenomolybdate was prepared by mixing amounts of zirco-nium oxychloride selenous acid and ammoniummolybdatewith molar ratio 2 2 1 with constant stirring e pHwas adjusted to be 3 by adding ammonia solution Aerstanding for 24 h the precipitate was separated by suctionand washed with water e separated precipitate was driedat 50∘C packed in chromatographic column and convertedinto the H+-form by passing 10minus1MHNO3 acid solutioneobtained exchanger was washed again with water and redriedat 50∘C

23 Batch Distribution Studies e distribution coefficientsfor 134Cs(I) 152154Eu and 60Co(II) ions in aqueous HNO3acid solutions on zirconium selenomolybdate matrix wereindividually determined by the static batch equilibrationtechnique using the following equation

119870119870119889119889 =119860119860119894119894 minus 119860119860119891119891119860119860119891119891times11988111988111989811989810076491007649mLg10076651007665 (1)

where 119860119860119894119894 and 119860119860119891119891 are the counting rates of the aqueousphase before and aer equilibration with the gel matrix

respectively 119881119881 is the volume of the aqueous phase (10mL)and119898119898 is the weight of the gel matrix (01 g)

24 Capacity Studies Chromatographic column break-through investigations were conducted by passing HNO3solutions (10minus2M) of appropriate volumes 10minus2M of eachof 134Cs(I) 152154Eu and 60Co(II) individually throughglass columns (06 cm id) packed with 1 g of zirconiumselenomolybdate matrix at a ow rate of 05mLmin ebreakthrough capacities (119876119876rsquos) of these ions were calculatedfrom the following equation

119876119876 =11986211986201198811198815011990811990810076491007649mmolg10076651007665 (2)

where 1198621198620 is the initial metal ion concentration of thecorresponding nuclide (M) in its feeding solution 11988111988150 isthe effluent volume (mL) at 1198621198621198621198620 = 05 (as indicatedby measuring the counting rates of the initial solution anddifferent effluent fractions) and119908119908 is the weight of the columnmatrix

25 Chromatographic Separation A mixture solution of134Cs(I) 152154Eu and 60Co(II) ions in HNO3 acid (10minus2Mand pH 2) was passed through a chromatographic column(06 cm id) containing 1 g of zirconium selenomolybdatematrix at a ow 05mLmin e radionuclides were sepa-rated from each other by eluting the loaded column withHNO3 acid and NH4Cl solutions of different volumes andconcentration

3 Results and Discussion

31 Distribution Coefficients of Cs(I) Eu(III) and Co(II) onZirconium Selenomolybdate Matrix Individual interactionsof 134Cs(I) 152154Eu(III) and 60Co(II) ions (sim1 times 10minus4M foreach) in HNO3 acid solutions with zirconium selenomolyb-date matrix dried at 50∘C were investigated by the batchequilibrationmethod under comparable experimental condi-tions to make possible evaluation of the obtained 119870119870119889119889 valuesfor the retention and separation of these ions Figure 1 dis-plays the variation of the119870119870119889119889 values of

134Cs(I) 152154Eu(III)and 60Co(II) radionuclides individually in HNO3 acid solu-tions on zirconium selenomolybdate as a function of the acidconcentration in the range from 1 times 10minus3 to 1M HNO3It is observed that the 119870119870119889119889 values 134Cs(I) 152154Eu(III)and 60Co(II) radionuclides decrease with increasing the acidconcentration in the equilibrating solutions e obtainedresults may be attributed to the greater competition betweenthe respective cations in solution to exchange with H+-ionson the surface of zirconium selenomolybdate e reten-tion behaviour of 134Cs(I) and 152154Eu(III) on zirconiumselenomolybdate is characterized by plateaus (of almost 119870119870119889119889values of 1160 280mLg resp) in dilute acid solutions ofconcentration up to 8 times 10minus2 and 3 times 10minus2M respectivelyereaer the corresponding 119870119870119889119889 values linearly decreasewith increasing the acid concentration It is also observed that

Journal of Chemistry 3

001 01 1 1001

1

10

Co(II)

Eu(III)

Cs(I)

100

1000

10000

HNO3 acid concentration (M)

F 1 Distribution coefficients of 134Cs(I) 152154Eu(III) and60Co(II) in HNO3 acid solutions on zirconium selenomolybdatematrix as a function of the acid concentration

the 119870119870119889119889 values of the three nuclides increase in the followingorder

Cs (I) gt Eu (III) gt Co (II) (3)

is selectivity sequence may be attributed to the fact thatCs(I) ions are more able to diffuse through the sorbent andreach a higher number of the exchange sites than Eu(III)and Co(II) is may be attributed to that Cs(I) ions havelarger effective ionic radii than Eu(III) and Co(II) ionsand can easily be dehydrated [2] In addition e higher119870119870119889119889 values for Cs(I) compared with Eu(III) and Co(II) onzirconium selenomolybdate may be attributed to the highselectivity of the heteropolyacids for largemonovalent cations(LMCrsquos) such as Cs(I) Ag(I) and Tl(I) which form insolubleheteropolyacid salts [2 23] Table 1 compiles the calculatedseparation factors(120572120572) of Cs(I) Eu(III) and Co(II) from eachother

32 Breakthrough Capacities of Cs(I) Eu(III) and Co(II)on Zirconium Selenomolybdate Matrix Figure 2 illustratesthe breakthrough behaviour of 134Cs(I) 152154Eu(III) and60Co(II) from 1 g zirconium selenomolybdate column(06 cm id) matrix fed with 140mL 1 times 10minus2M 134Cs(I)152154Eu(III) and 60Co(II) in 1 times 10minus2M HNO3 acid at aow rate of 05mLmin Figure 2 indicates (i) an immediatebreakthrough of 60Co(II) and 100 breakthrough at 60mLeffluent volume and (ii) quantitative adsorption of 134Cs and152154Eu up to sim10 and 50mL effluent volume respectivelyaer which concentration in the effluent is graduallyincreases Substituting the values of the effluent volumecorresponding to 50134Cs(I) 152154Eu(III) and 60Co(II)breakthrough the initial concentration (1198621198620 = 1 times 10minus2M)and amount of the bed matrix (119898119898 119898 1 g) (2) a value of 082045 and 018mmolg of zirconium selenomolybdate for134Cs(I) 152154Eu(III) and 60Co(II) respectively

Co(II) Eu(III) Cs(I)

0 20 40 60 80 100 120 140

0

20

40

60

80

100

Bre

akth

rou

gh (

)

Effluent volume (mL)

F 2 Breakthrough curves of Cs(I) Eu(III) and Co(II) from1 g zirconium selenomolybdate column (06 cm id) matrix usingindividual feeding solution of 1 times 10minus2M in 1 times 10minus3M HNO3 acidat a ow rate 05mLmin

Co(II)

Eu(III)

Cs(I)

0 10 20 30 40 50 600

10

20

30

40

50

Rad

ioac

tivi

ty (

)

Eluate volume (mL)

1 times 10minus1MHNO3 25 times 10minus1 MHNO3 2 M NH4Cl

F 3 Elution proles of Cs(I) Eu(III) and Co(II) from 1 gzirconium selenomolybdate column (06 cm id) with HNO3 andNH4Cl solutions at a ow rate 05mLmin

33 Separation of Cs(I) Eu(III) and Co(II) Using a ZirconiumSelenomolybdate Chromatographic Column A mixture ofCs(I) Eu(III) and Co(II) (1 times 10minus2M each) in 140mL of1 times 10minus2M HNO3 acid solution was passed through a 1 gzirconium selenomolybdate column (06 cm id) at a ow rateof 05mLmin Figure 3 shows the elution proles of Cs(I)Eu(III) and zirconium selenomolybdate column (06 cm id)at a ow rate of 05mLmin It is observed that Co(II) of thelower affinity for the bed matrix immediately passed alongthe column bed matrix leaving Eu(III) and Cs(I) of relativelyhigher affinity build up onto the bed matrix e retainedCo(II) was eluted from the column bed by passing 14mL1 times 10minus1M HNO3 acid solution at a ow rate 05mLminereaer quantitative elution of Eu(II) was achieved by


T 1 e calculated separation factors (120572120572) of Cs(I) Eu(III) andCo(II)

Acidconcentration M

Separation factors 120572120572119870119870dCs(I)119870119870dEu(III) 119870119870dCs(I)119870119870dco(II) 119870119870dEu(III)119870119870dco(II)

3 times 10minus3 42 387 941 times 10minus2 4 1185 2954 times 10minus2 41 3957 9678 times 10minus2 84 6667 803 times 10minus1 50 1250 251 100 700 7

passing 22mL 25 times 10minus1MHNO3 acid solution at a ow rateof 05mmin Cs(I) was strongly adsorbed onto the matrixbecause of the formation of insoluble heteropolyacid saltswhich is oen the case with large monovalent cations andheteropolyacids Consequently it typically requires anothermonovalent cations of very similar bar ionic radius toexchange Cs(I) NH4Cl was used for the elution of Cs About89 of Cs(I) was eluted with 32mL 2M NH4Cl solution at aow rate of 05mLmin Complete recovery of Cs(I) could beachieved aer decomposing the adsorbent

As a heteropolyacid salt zirconium selenomolybdateis very selective for cesium But comparing zirconiumselenomolybdate with 12-tungstocerate we found that Cswas recovered completely with 2M HNO3 acid solu-tion but in our study about 89 of the retained Cs(I)was eluted with 2M NH4Cl solution which means it isadsorbed strongly enable us in a following study to sepa-rate parent(137Cs)daughter(137119898119898Ba) isobars onto chromato-graphic columns in the form of radioisotope generators

4 Conclusion

Chromatographic column of zirconium selenomolybdatewas used successfully for separation of cesium europiumand cobalt from their aqueous mixture solution by elutionwith HNO3 and NH4Cl

Acknowledgment

e authors would like to express their appreciation forsupport of colleagues in Radioactive Isotopes and GeneratorsDepartment Hot Labs Center Egyptian Atomic EnergyAuthority

References

[1] AMushtaq ldquoInorganic ion-exchangers their role in chromato-graphic radionuclide generators for the decade 1993ndash2002rdquoJournal of Radioanalytical and Nuclear Chemistry vol 262 no3 pp 797ndash810 2004

[2] M Qureshi and K G Varshney Inorganic Ion Exchangers inChemical Analysis CRC Press Boca Raton Fla USA 1991

[3] V V Pushkarev Y V Egorov E V Tkachenko and V LZolotavin ldquoe clarication and purication of radioactive

waste water by the otation methodrdquo Soviet Atomic Energy vol16 no 1 pp 50ndash52 1964

[4] A S Mollah A Begum and M M Rahman ldquoRemoval ofradionuclides from low level radioactive liquid waste by precip-itationrdquo Journal of Radioanalytical and Nuclear Chemistry vol229 no 1-2 pp 187ndash189 1998

[5] M Kyrš K Svoboda P Lhotaacutek and J Alexovaacute ldquoSynergisticsolvent extraction of Eu Sr andCs into chlorobenzene solutionsof the three conformers of tetrathiocalixarene and dicarbolliderdquoJournal of Radioanalytical and Nuclear Chemistry vol 258 no3 pp 497ndash509 2003

[6] P Rajec L Maacutetel J Orechovskaacute J Šuacutecha and I NovaacutekldquoSorption of radionuclides on inorganic sorbentsrdquo Journal ofRadioanalytical and Nuclear Chemistry vol 208 no 2 pp477ndash486 1996

[7] B El-Gammal and S A Shady ldquoChromatographic separationof sodium cobalt and europium on the particles of zirconiummolybdate and zirconium silicate ion exchangersrdquo Colloids andSurfaces A vol 287 no 1ndash3 pp 132ndash138 2006

[8] J Lehto R Harjula H Leinonen et al ldquoAdvanced separation ofharmfulmetals from industrial waste effluents by ion exchangerdquoJournal of Radioanalytical and Nuclear Chemistry vol 208 no2 pp 435ndash443 1996

[9] TMller A Cleareld and R Harjula ldquoPreparation of hydrousmixed metal oxides of Sb Nb Si Ti and W with a pyrochlorestructure and exchange of radioactive cesium and strontiumions into thematerialsrdquoMicroporous andMesoporousMaterialsvol 54 no 1-2 pp 187ndash199 2002

[10] Y Koudsi and A Dyer ldquoSorption of 60Co on a synthetictitanosilicate analogue of the mineral penkvilksite-2O andantimonysilicaterdquo Journal of Radioanalytical andNuclear Chem-istry vol 247 no 1 pp 209ndash219 2001

[11] S Lahiri K Roy S Bhattacharya S Maji and S BasuldquoSeparation of 134Cs and 152Eu using inorganic ion exchangerszirconium vanadate and ceric vanadaterdquo Applied Radiation andIsotopes vol 63 no 3 pp 293ndash297 2005

[12] R Koivula RHarjula and J Lehto ldquoStructure and ion exchangeproperties of tin antimonates with various Sn and Sb contentsrdquoMicroporous and Mesoporous Materials vol 55 no 3 pp231ndash238 2002

[13] T J Tranter R S Herbst T A Todd A L Olson and HB Eldredge ldquoEvaluation of ammonium molybdophosphate-polyacrylonitrile (AMP-PAN) as a cesium selective sorbentfor the removal of 137Cs from acidic nuclear waste solutionsrdquoAdvances in Environmental Research vol 6 no 2 pp 107ndash1212002

[14] H El-SaidMMostafa andMA El-Amir ldquoStudy of chromato-graphic separation of cesium europium and cobalt on differenttypes of tungstocerate columnmatricesrdquo Solvent Extraction andIon Exchange vol 26 no 6 pp 722ndash734 2008

[15] S A Nabi Alimuddin and A Islam ldquoSynthesis and characteri-zation of a new cation exchanger-zirconium(IV)iodotungstateseparation and determination ofmetal ion contents of syntheticmixtures pharmaceutical preparations and standard referencematerialrdquo Journal of Hazardous Materials vol 172 no 1 pp202ndash207 2009

[16] Rakkar and U Chudasama ldquoSynthesis and characterizationof zirconium titanium phosphate and its application in separa-tion of metal ionsrdquo Journal of Hazardous Materials vol 172 no1 pp 129ndash137 2009

[17] F M Zonoz S J Ahmadi S A Nosrati and M G MaraghehldquoPreparation and characterization of zirconium (IV) molybdo


tungsto vanado silicate as a novel inorganic ion exchanger insorption of radionuclidesrdquo Journal of Hazardous Materials vol169 no 1ndash3 pp 808ndash812 2009

[18] M N Akieh M Lahtinen A Vaumlisaumlnen and M SillanpaumlaumlldquoPreparation and characterization of sodium iron titanate ionexchanger and its application in heavy metal removal fromwaste watersrdquo Journal of Hazardous Materials vol 152 no 2pp 640ndash647 2008

[19] Q Zhang B Pan W Zhang et al ldquoSelective removal of Pb(II)Cd(II) and Zn(II) ions from waters by an inorganic exchangerZr(HPO3S)2rdquo Journal of Hazardous Materials vol 170 no 2-3pp 824ndash828 2009

[20] E Repo T A Kurniawan J K Warchol and M E T SillanpaumlaumlldquoRemoval of Co(II) and Ni(II) ions from contaminated waterusing silica gel functionalized with EDTA andor DTPA aschelating agentsrdquo Journal of Hazardous Materials vol 171 no1-3 pp 1071ndash1080 2009

[21] E Repo R Petrus M Sillanpaumlauml and J K Warchoł ldquoEquilib-rium studies on the adsorption of Co(II) and Ni(II) by modi-ed silica gels one-component and binary systemsrdquo ChemicalEngineering Journal vol 172 no 1 pp 376ndash385 2011

[22] A P Gupta G L Verma and S Ikram ldquoStudies on a newheteropolyacid-based inorganic ion exchanger zirconium(IV)selenomolybdaterdquoReactive and Functional Polymers vol 43 no1 pp 33ndash41 2000

[23] H El-Said M Mostafa and M A El-Amir ldquoPotential use oftungstocerate matrices on the separation of 113mIn from 110mAgrelevant to the separation of the cyclotron-produced 111Infrom its silver targetrdquo Journal of Radioanalytical and NuclearChemistry vol 279 no 1 pp 263ndash269 2009

Submit your manuscripts athttpwwwhindawicom

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Quantum Chemistry


Organic Chemistry International


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ElectrochemistryInternational Journal of



medicine and industry in quality control process 152154Euand 60Co are used for producing sealed sources which areused in medicine and industry

e present work aims at (i) preparation of zirconi-um(IV) selenomolybdate (ii) determination of batch distri-bution coefficients of 134Cs(I) 152154Eu and 60Co(II) fromHNO3 solutions individually on zirconium(IV) selenomo-lybdate matrix (iii) determination of the breakthroughcapacities of zirconium(IV) selenomolybdatematrix for theseions and (iv) separation of these radionuclides from eachother by loading their mixture solution in HNO3 onto achromatographic column of the matrix and eluting themsubsequently with HNO3 solutions andor other solutions ofdifferent concentrations

2 Experimental

All chemicals were of A R grade Distilled water was usedfor different solution preparations and washing Radiometricidentication and measurements were made by using amultichannel analyzer (MCA) of ldquoInspector 2000rdquo modelCanberra Series made in USA coupled with a high-puritygermanium coaxial detector (HPGe) of ldquoGX2518rdquo model

21 Radiotracers of 134Cs 152154Eu and 60Co Radionuclidesof 134Cs and 60Co were produced by thermal neutron irra-diation of CsCl and CoCl2 target materials in the water-cooled ETRR-2 Research Reactor (Egypt) for 4 h at a ther-mal neutron ux of 1 times 1014 n cmminus2 sminus1 Radionuclides of152154Eu were produced by thermal neutron irradiation ofEu2O3 target materials in the water-cooled ETRR-1 ResearchReactor (Egypt) for 48 h at a thermal neutron ux of 1 times1013 n cmminus2 sminus1

22 Preparation of Zirconium Selenomolybdate Zirconiumselenomolybdate was prepared by mixing amounts of zirco-nium oxychloride selenous acid and ammoniummolybdatewith molar ratio 2 2 1 with constant stirring e pHwas adjusted to be 3 by adding ammonia solution Aerstanding for 24 h the precipitate was separated by suctionand washed with water e separated precipitate was driedat 50∘C packed in chromatographic column and convertedinto the H+-form by passing 10minus1MHNO3 acid solutioneobtained exchanger was washed again with water and redriedat 50∘C

23 Batch Distribution Studies e distribution coefficientsfor 134Cs(I) 152154Eu and 60Co(II) ions in aqueous HNO3acid solutions on zirconium selenomolybdate matrix wereindividually determined by the static batch equilibrationtechnique using the following equation

119870119870119889119889 =119860119860119894119894 minus 119860119860119891119891119860119860119891119891times11988111988111989811989810076491007649mLg10076651007665 (1)

where 119860119860119894119894 and 119860119860119891119891 are the counting rates of the aqueousphase before and aer equilibration with the gel matrix

respectively 119881119881 is the volume of the aqueous phase (10mL)and119898119898 is the weight of the gel matrix (01 g)

24 Capacity Studies Chromatographic column break-through investigations were conducted by passing HNO3solutions (10minus2M) of appropriate volumes 10minus2M of eachof 134Cs(I) 152154Eu and 60Co(II) individually throughglass columns (06 cm id) packed with 1 g of zirconiumselenomolybdate matrix at a ow rate of 05mLmin ebreakthrough capacities (119876119876rsquos) of these ions were calculatedfrom the following equation

119876119876 =11986211986201198811198815011990811990810076491007649mmolg10076651007665 (2)

where 1198621198620 is the initial metal ion concentration of thecorresponding nuclide (M) in its feeding solution 11988111988150 isthe effluent volume (mL) at 1198621198621198621198620 = 05 (as indicatedby measuring the counting rates of the initial solution anddifferent effluent fractions) and119908119908 is the weight of the columnmatrix

25 Chromatographic Separation A mixture solution of134Cs(I) 152154Eu and 60Co(II) ions in HNO3 acid (10minus2Mand pH 2) was passed through a chromatographic column(06 cm id) containing 1 g of zirconium selenomolybdatematrix at a ow 05mLmin e radionuclides were sepa-rated from each other by eluting the loaded column withHNO3 acid and NH4Cl solutions of different volumes andconcentration

3 Results and Discussion

31 Distribution Coefficients of Cs(I) Eu(III) and Co(II) onZirconium Selenomolybdate Matrix Individual interactionsof 134Cs(I) 152154Eu(III) and 60Co(II) ions (sim1 times 10minus4M foreach) in HNO3 acid solutions with zirconium selenomolyb-date matrix dried at 50∘C were investigated by the batchequilibrationmethod under comparable experimental condi-tions to make possible evaluation of the obtained 119870119870119889119889 valuesfor the retention and separation of these ions Figure 1 dis-plays the variation of the119870119870119889119889 values of

134Cs(I) 152154Eu(III)and 60Co(II) radionuclides individually in HNO3 acid solu-tions on zirconium selenomolybdate as a function of the acidconcentration in the range from 1 times 10minus3 to 1M HNO3It is observed that the 119870119870119889119889 values 134Cs(I) 152154Eu(III)and 60Co(II) radionuclides decrease with increasing the acidconcentration in the equilibrating solutions e obtainedresults may be attributed to the greater competition betweenthe respective cations in solution to exchange with H+-ionson the surface of zirconium selenomolybdate e reten-tion behaviour of 134Cs(I) and 152154Eu(III) on zirconiumselenomolybdate is characterized by plateaus (of almost 119870119870119889119889values of 1160 280mLg resp) in dilute acid solutions ofconcentration up to 8 times 10minus2 and 3 times 10minus2M respectivelyereaer the corresponding 119870119870119889119889 values linearly decreasewith increasing the acid concentration It is also observed that


001 01 1 1001

1

10

Co(II)

Eu(III)

Cs(I)

100

1000

10000








0 20 40 60 80 100 120 140

0

20

40

60

80

100

Bre

akth

rou

gh (

)



Co(II)

Eu(III)

Cs(I)

0 10 20 30 40 50 600

10

20

30

40

50

Rad

ioac

tivi

ty (

)

Eluate volume (mL)






Acidconcentration M





4 Conclusion


Acknowledgment


References




































Journal of

Chemistry


Advances in

Physical Chemistry



Journal of

Volume 2014














Journal of

Spectroscopy



Journal of


Quantum Chemistry




CatalystsJournal of




001 01 1 1001

1

10

Co(II)

Eu(III)

Cs(I)

100

1000

10000








0 20 40 60 80 100 120 140

0

20

40

60

80

100

Bre

akth

rou

gh (

)



Co(II)

Eu(III)

Cs(I)

0 10 20 30 40 50 600

10

20

30

40

50

Rad

ioac

tivi

ty (

)

Eluate volume (mL)






Acidconcentration M





4 Conclusion


Acknowledgment


References




































Journal of

Chemistry


Advances in

Physical Chemistry



Journal of

Volume 2014














Journal of

Spectroscopy



Journal of


Quantum Chemistry




CatalystsJournal of





Acidconcentration M





4 Conclusion


Acknowledgment


References




































Journal of

Chemistry


Advances in

Physical Chemistry



Journal of

Volume 2014














Journal of

Spectroscopy



Journal of


Quantum Chemistry




CatalystsJournal of




















Journal of

Chemistry


Advances in

Physical Chemistry



Journal of

Volume 2014














Journal of

Spectroscopy



Journal of


Quantum Chemistry




CatalystsJournal of



researcharticle radiochemicalstudiesontheseparationof ... · journalofchemistry 3 0.01 0.1 1 10 0.1...

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