E. Blasius

Darstellung und eigenschaften von austauschern auf basis von kronenverbindungen

Preparation and properties of ion exchangers based on macrocyclic polyethers Two exchangers that are condensed with macrocyclic polyethers are examined as complexing reagents. These ion exchangers are easily prepared, thermically stable and have a capacity of 2.6 and 1.8 mequiv./g air-dry resin, respectively. They show a very different selectivity for the cations of alkali and alkaline earth elements and for differently substituted or structurally isomeric ammonium cations. Owing to the different partition coefficients, separations will be possible in every individual group as well as among the groups.

Separation of strontium from nuclear waste solutions by solvent extraction with crown ethers

The possibilities of strontium separation from medium activity waste (MAW) solutions have been investigated. MAW originates from the PUREX process and contains NaNO3 and HNO3 in a large excess. By solvent extraction with the crown ether dicyclohexano-18-crown-6 (DC-18-C-6) in 1,1,2,2-tetrachloroethane, separation is possible. The distribution ratio for Sr2+ depends on the concentration of HNO3, NaNO3 and Pb(NO3)2. The extraction system is employed in a continuous counter-current process. After use, the extraction agent can easily be regenerated by reextraction with pure water.

Austauscher mit monobenzokryptand K[2B,2.2.] als ankergruppe

Abstract The capacity of the thermally and chemically very resistent exhanger with monobenzocryptate K[2B.2.2.] as anchor group is 1.2 mmol/g of air-dried resin. This exchanger shows different selectivities for several alkali metal salts. Seperations of alkali chlorides are described.

Gelionophoretische trennung und chrakterisierung gemischter cyano—thiocyanatochromate(III)

Separation and charaterisation of mixed cyano—thiocyanatochromates(III) by gel ionophoresis The mixed ligand complexes [Cr(SCN)x(CN)6−x]3− are separated by an electrophoretic apparatus consisting of a separating tube. The composition of the complexes is confirmed by elementary analysis and absorption spectra.

Anwendung von Austauschern mit cyklischen Polyäthern als Ankergruppen in der Mikro- und Spurenanalyse

ZusammenfassungEine Übersicht über die Eigenschaft neuartiger Austauscher mit cyklischen Polyäthern als Ankergruppen-ein Arbeitsgebiet, das noch stark ausbaufähig ist-wurde gegeben. Unter Verwendung der beschriebenen Meßanordnungen sind Bestimmungen der getrennten Verbindungen bis in den Mikro- und Spurenbereich (μg bis pg) möglich. Spurenanreicherungen lassen sich gut durchführen.SummaryThere is given a synopsis about the characteristics of new-fashioned exchangers based on cyclic polyethers-a field of activity with a great future. With the application of the described measuring methods the determinations of the separated compounds are possible to the range ofμg and pg. Enrichments of traces can be easily realized.

Vergleich der trennleistung verschiedener Hochspannungsionophorese-Apparaturen☆

Abstract Comparison of the separation performance of different high-voltage ionophoresis apparatuses The separations obtained with two self-constructed electrophoresis apparatuses are compared. Apparatus II, in which the paper strips are uniformly pressed on to a metal cooling surface, is superior to apparatus I which consists of two glass cooling plates. It is possible to determine 35 S-labelled products quantitatively with apparatus II since the peaks on the activity distribution curves do not usually coincide. With particularly difficult problems, such as the separation of polysulphanediphosphonates and polysulphanesulphonphosphonates, Satisfactory results can only be obtained with apparatus II. Information about the chemical aspects of this work will be reported in subsequent publications.

Chelatbildende austauscherharze : VI. Pyridin-2,6-dicarbonsäure-austauscher für die trennung Ca2+/Sr2+

Zusammenfassung Durch Umsetzung von Poly-aminostyrol, Polyathylenimin und Poly-(athylendiaminomethyl)-styrol mit 4-Chlor-pyridin-2,6-dicarbonsaure konnten drei chelatbildende Austauscherharze dargestellt werden, die im Aufbau ihres austauschaktiven Grundkorpers angenahert der 4-(N-Phenyl)-amino-, 4-Dimethylamino-, bzw. der 4-Methylamino-pyridin-2,6-dicarbonsaure entsprechen. Als viertes Chelatharz wurde ein Mischkondensat aus Pyridin-2,6-dicarbonsaure-dihydrazid, Resorcin und Formaldehyd hergestellt. Mit einer Ausnahme [Gerustkorper Poly-(athylendiamino-methyl)-styrol] besitzen samtliche beschriebenen Chelatharze gute mechanische und chemische Eigenschaften sowie eine hohe Kapazitat. An den Pyridin-2,6-dicarbonsaure-Harzen auf Poly-aminostyrol- und Polyathylenimin-Basis wurden chromatographische Trennungen durchgefuhrt. Vor allem das Polyathylenimin-Harz ist fur die Ca2+/Sr2+-Trennung gut geeignet. Es hat eine beachtliche Ca2+-Kapazitat (4.2 mVal/g) und kann daher zur Trennung grosserer Mengen eingesetzt werden.

Papierionophoretische verfolgung der darstellung gemischter cyano-thiocyanatochromate(III)

Abstract Paper ionophoretic investigation of the composition of a mixture of cyano-thiocyanatochromates(III) When K 3 [Cr(SCN) 6 ] reacts with KCN in boiling acetonitrile a mixture of all complex ions [Cr(SCN) 6− x (CN) x ] 3− ( x = 0, 1, … 6) is formed. This reaction can be observed by high-voltage paper ionophoresis. The R B -values give a first evidence of the composition of the complex ions.

Apparatur zur gelionophorese in nichtwässrigen lösungsmitteln

Abstract Apparatus for gel ionophoreis in non-aqueous solvents A simple ionophoretic technique has been developed using the method of moving boundaries. Stabilisation of the separating media can be accomplished by gel-forming cellulose acetate. The gelling agents hold out promise of use on a wider scale for ionophoresis in non-aqueous solvents. The method is verified by separating [Cr(SCN)6]3- and [Cr(CN)6]3- in formamide.

Hochspannungspapierionophorese im temperaturgradienten und in nichtwässrigen lösungsmitteln

Abstract High-voltage paper ionophoresis in temperature gradients and non-aqueous solutions An improved separation chamber for high-voltage ionophoresis by means of a temperature gradient has been developed. It enables a temperature gradient 3°/cm. Quantitative evaluations show an improvement of separation efficiency up to 50% compared to separations at 0°. Additional advantages are achieved for non-aqueous electrolyte systems, which show a more temperature-depending viscosity than the aqueous electrolyte solutions. The application of wedge-shaped paperstrips to avoid field strength gradients is not necessary.