SORPTION OF ZIRCONIUM AND HAFNIUM ON SILICA GEL IN THE PRESENCE OF PHOSPHORIC AND PHENYLARSENIC ACID AND IODATECALETKA R.1975; COLLECT. CZECHOSL. CHEM. COMMUNIC.; CZECHOSL.; DA. 1975; VOL. 40; NO 10; PP. 2941-2954; BIBL. 18 REF.Article

ADSORPTION PROPERTIES OF AMMONIUM MOLYBDOPHOSPHATE SUPPORTED IN PORES OF SILICA GELCALETKA R; KONECNY C.1972; RADIOCHEM. RADIOANAL. LETTERS; SWITZ.; DA. 1972; VOL. 12; NO 6; PP. 325-329; BIBL. 8 REF.Serial Issue

DETERMINATION OF ARSENIC AND ANTIMONY IN NIOBIUM BY RADIOCHEMICAL NEUTRON ACTIVATION-GAMMA SPECTROMETRYCALETKA R; KRIVAN V.1982; ANAL. CHIM. ACTA; ISSN 0003-2670; NLD; DA. 1982; VOL. 143; PP. 269-272; BIBL. 10 REF.Article

EXTRAKTION VON ELEMENTEN MIT DITHIZON UND DIETHYLAMMONIUM-N,N'-DIETHYLDITHIOCARBAMAT AUS FLUSSSAUREN LOESUNGEN UND IHRE ANWENDUNG IN DER ANALYSE VON NIOB = EXTRACTION D'ELEMENTS AVEC LA DITHIZONE ET LE N,N'-DIETHYLDITHIOCARBAMATE DE DIETHYLAMMONIUM A PARTIR DE SOLUTIONS FLUORHYDRIQUES ET APPLICATION A L'ANALYSE DU NIOBIUMCALETKA R; KRIVAN V.1982; FRESENIUS Z. ANAL. CHEM.; ISSN 0016-1152; DEU; DA. 1982; VOL. 311; NO 3; PP. 177-182; ABS. ENG; BIBL. 19 REF.Article

SORPTION OF GERMANIUM ON SILICA GEL FROM AQUEOUS AND MIXED AQUEOUS-ORGANIC SOLUTIONSCALETKA R.1974; COLLECT. CZECHOSL. CHEM. COMMUNIC.; CZECHOSL.; DA. 1974; VOL. 39; NO 12; PP. 3660-3671; BIBL. 25 REF.Article

UPTAKE OF INORGANIC ACIDS ON HYDROGELS OF TETRAVALENT HYDROXIDES AND ITS APPLICATION FOR THE PREPARATION OF SOME INORGANIC SORBENTSCALETKA R; TYMPL M.1976; J. RADIOANAL. CHEM.; SWITZ.; DA. 1976; VOL. 30; NO 1; PP. 155-172; BIBL. 30 REF.; (RADIOCHEM. CONF. 8. I; MARIANSKE LAZNE, CZECH.; 1975)Conference Paper

PURIFICATION OF RADIOZIRCONIUM AND THE INFLUENCE OF ACCUMULATION OF DAUGHTER RADIOACTIVITY ON THE ACCURACY OF ITS DISTRIBUTION MEASUREMENTSCALETKA R; KOTAS P.1974; J. RADIOANAL. CHEM.; NETHERL.; DA. 1974; VOL. 20; NO 2; PP. 541-548; BIBL. 9 REF.Article

CATION-EXCHANGE OF 43 ELEMENTS FOR HYDROFLUORIC ACID SOLUTIONCALETKA R; KRIVAN V.1983; TALANTA (OXFORD); ISSN 0039-9140; GBR; DA. 1983; VOL. 30; NO 7; PP. 543-545; BIBL. 15 REF.Article

ADSORPTION PROPERTIES OF TITANIUM (IV) HEXACYANOFERRATE (II)CALETKA R; KONECNY C.1976; J. RADIOANAL. CHEM.; SWITZ.; DA. 1976; VOL. 30; NO NO 1; PP. 119-129; BIBL. 8 REF.; (RADIOCHEM. CONF. 8. I; MARIANSKE LAZNE, CZECH.; 1975)Conference Paper

UPTAKE OF PROTACTINIUM ON HYDROPHOBIC SILICA GEL FROM MIXED MEDIACALETKA R; SPEVACKOVA V.1975; RADIOCHEM. RADIOANAL. LETTERS; SWITZ.; DA. 1975; VOL. 23; NO 1; PP. 37-42; BIBL. 2 REF.Article

SORPTION OF POLYVALENT ELEMENTS ON SILICA GEL. V. SEPARATION OF MACROAMOUNTS OF ZIRCONIUM AND HAFNIUM BY SORPTION ON SILICA GELCALETKA R; SELUCKY P.1972; COLLECT. CZECHOSL. CHEM. COMMUNIC.; CZECHOSL.; DA. 1972; VOL. 37; NO 12; PP. 4008-4015; BIBL. 12 REF.Serial Issue

RETENTION OF ⁸⁵SR AND ¹⁴⁷PM ON INSOLUBLE HYDROXIDES AND PHOSPHATES PREPARED BY THE SOL-GEL PROCEDUREKEPAK F; CALETKA R; NOVA I et al.1975; J. RADIOANAL. CHEM.; SWITZ.; DA. 1975; VOL. 25; NO 2; PP. 247-254; BIBL. 7 REF.Article

DETERMINATION OF TI, V, CR, FE, AS, ZR, AND NB IN TUNGSTEN BY RADIOCHEMICAL PROTON ACTIVATION ANALYSISSASTRI CS; CALETKA R; KRIVAN V et al.1982; JOURNAL OF TRACE AND MICROPROBE TECHNIQUES; ISSN 51442X; USA; DA. 1982-1983; VOL. 1; NO 3; PP. 293-306; BIBL. 14 REF.Article

DETERMINATION OF PHOSPHORUS AT THE NG G^-1 LEVEL IN NIOBIUM BY A RADIOCHEMICAL NEUTRON ACTIVATION METHODCALETKA R; VORWALTER C; KRIVAN V et al.1982; ANAL. CHIM. ACTA; ISSN 0003-2670; NLD; DA. 1982; VOL. 141; PP. 393-397; BIBL. 15 REF.Article

TRENNUNGEN MIT TBP AUS SAUREN LOESUNGEN UNTER BESONDERER BERUECKSICHTIGUNG DES NIOBS ALS MATRIX = SEPARATIONS AVEC LE TRI-N-BUTYLPHOSPHATE A PARTIR DE SOLUTIONS ACIDES EN CONSIDERANT SPECIALEMENT LE NIOBIUM COMME MATRICECALETKA R; FABIAN W; KRIVAN V et al.1982; FRESENIUS Z. ANAL. CHEM.; ISSN 0016-1152; DEU; DA. 1982; VOL. 310; NO 1-2; PP. 39-44; ABS. ENG; BIBL. 19 REF.Article

ELEMENT DISTRIBUTION COEFFICIENTS FOR HYDROFLUORIC ACID/NITRIC ACID SOLUTIONS AND THE ANION EXCHANGE RESIN DOWEX 1 X 8FAIX WG; CALETKA R; KRIVAN V et al.1981; ANAL. CHEM. (WASH.); ISSN 0003-2700; USA; DA. 1981; VOL. 53; NO 11; PP. 1719-1721; BIBL. 3 REF.Article

RADIOCHEMICAL MULTIELEMENT NEUTRON ACTIVATION ANALYSIS OF HIGH-PURITY NIOBIUM WITH SHORT-LIVED INDICATOR RADIONUCLIDESFAIX WG; CALETKA R; KRIVAN V et al.1981; ANAL. CHEM. (WASH.); ISSN 0003-2700; USA; DA. 1981; VOL. 53; NO 11; PP. 1594-1598; BIBL. 22 REF.Article

SIMULTANEOUS DETERMINATION OF BORON AND LITHIUM BY CHARGED PARTICLE ACTIVATION ANALYSISSASTRI CS; CALETKA R; KRIVAN V et al.1981; ANAL. CHEM. (WASH.); ISSN 0003-2700; USA; DA. 1981; VOL. 53; NO 5; PP. 765-770; BIBL. 32 REF.Article

RADIOCHEMICAL MULTIELEMENT NEUTRON ACTIVATION ANALYSIS OF NIOBIUM VIA MEDIUM- AND LONG-LIVED RADIONUCLIDESCALETKA R; FAIX WG; KRIVAN V et al.1982; J. RADIOANAL. CHEM.; ISSN 0022-4081; CHE; DA. 1982; VOL. 72; NO 1-2; PP. 109-130; BIBL. 25 REF.Conference Paper

SORPTION PROPERTIES OF IRON(II) SULPHIDE PREPARED BY THE SOL-GEL METHODCALETKA R; TYMPL M; KOTAS P et al.1975; J. CHROMATOGR.; NETHERL.; DA. 1975; VOL. 111; NO 1; PP. 93-104; BIBL. 17 REF.Article

Anion-exchange behaviour of some elements in HF-HC1 mediumCALETKA, R; KRIVAN, V.Journal of radioanalytical and nuclear chemistry. 1990, Vol 142, Num 2, pp 373-382, issn 0236-5731Article

Behaviour of 18 elements in the HF and HF-NH₄F media on anion exchanger in various ionic formsCALETKA, R; KRIVAN, V.Journal of radioanalytical and nuclear chemistry. 1990, Vol 142, Num 2, pp 359-371, issn 0236-5731Article

Separation of niobium and tantalum on polyurethane foam pretreated with diantipyrylmethane, TBP or MIBKCALETKA, R; KRIVAN, V.Fresenius' Zeitschrift für analytische Chemie. 1985, Vol 321, Num 1, pp 61-64, issn 0016-1152Article

Substoichiometric extraction of tantalum with diantipyrylmethaneCALETKA, R; KRIVAN, V.Analytica chimica acta. 1984, Vol 162, pp 67-73, issn 0003-2670Article

Aufschluss von Niob durch Chlorierung und Abtrennung der Spurenverunreinigungen von der Matrix durch homogene Fällung = Attaque du niobium par action du chlore et séparation des impuretés en traces à partir de la matrice par précipitation homogène = Digestion of niobium by chlorination and separation of the trace contaminants from the matrix by homogeneous precipitationBARTH, P; CALETKA, R; KRIVAN, V et al.Fresenius' Zeitschrift für analytische Chemie. 1984, Vol 319, Num 5, pp 560-562, issn 0016-1152Article