Spurenanalyse der Elemente: Anreicherung durch Austauscher und Sorbentien

Lieser, Κ. H.

doi:10.1007/978-3-642-70167-2_6

Cited by 5 publications

(3 citation statements)

References 129 publications

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“…The following general statements may be made for type A sorption -Sorption is proportional to the specific surface area -Sorption equilibria are established very fast with halftimes of the order of 10 s to 1 min [7]. -The contribution to the overall sorption ratio /^(obs) of natural sediments is in most cases relatively low and may be of the order of several percent.…”

Section: Introduction and Theoretical Backgroundmentioning

confidence: 99%

“…For these substances, physical absorption of ions, molecules or complexes, respectively, is the predominant sorption mechanism. Chemisorption may also take place, if hydroxo complexes of metals or anions are present that may be bound on the surface of silicates or oxides by chemical bonds [6,7]. Generally, ion exchange is of less importance.…”

Section: Introduction and Theoretical Backgroundmentioning

confidence: 99%

“…Generally, ion exchange is of less importance. However, it may be found on the surface of carbonates or other ionic compounds [6,7].…”

Section: Introduction and Theoretical Backgroundmentioning

confidence: 99%

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Sorption of Trace Elements or Radionuclides in Natural Systems Containing Groundwater and Sediments

1986

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Sorption of radionuclides / Sorption ratio / Sorption mechanisms / Radioactive Cs + ¡Radioactive Sr 2+ /Radioactive Ce 3+ Summary A general formula for the sorption ratio that is observed experimentally in natural systems is presented taking into account three kinds of processes: sorption at the outer surface of the solid particles, sorption in porous particles and one-directional processes such as precipitation or coprecipitation. These various processes as well as the mechanisms and the kinetics of sorption are discussed.The sorption of radioactive Cs + , Sr 2+ and Ce 3+ is studied in two selected natural sediment/groundwater systems, one of low and one of high salinity, under various conditions. Cs + ions are mainly sorbed in clay minerals that are suspended in the groundwater with relatively high sorption ratios, Sr 2+ ions are mainly sorbed on the sediments with relatively low sorption ratios, and Ce 3+ is mainly found in form of colloids or in suspended particles or in coprecipitates. Coprecipitation leads to very high sorption ratios for Ce 3+ . The behaviour of Cs + , Sr 2+ and Ce 3+ is typical for all elements with similar properties.

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Section: Introduction and Theoretical Backgroundmentioning

confidence: 99%

Section: Introduction and Theoretical Backgroundmentioning

confidence: 99%

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Sorption of Trace Elements or Radionuclides in Natural Systems Containing Groundwater and Sediments

1986

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Syntheses of cellulose exchangers carrying chelating anchor groups for selective separation of uranyl ions

Fischer

Lieser

1993

Angew. Makromol. Chem.

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Syntheses of cellulose exchangers carrying tailor‐made chelating anchor groups are described. One type of anchor groups offers three coplanar carboxy groups for the complexation of UO2+2, a second type coplanar amidoxime‐hydroxamic acid groups and a third type amidrazone‐hydrazide groups. The distance of the groups is varied by use of different terminal dibromo‐n‐alkanes. The anchor groups of type 1 are obtained from malonic acid diethyl ester and dibromalkanes, type 2 and 3 from cyanacetic acid ethylester and dibromoalkanes. The products containing malonic acid diethylester and alkane groups or cyanoacetic acid ethylester and alkane groups, respectively, in the mole ratio 3 : 2 are coupled with hydrazinedesoxycellulose. The carboxy groups are set free by hydrolysis of the ethyl esters in case of type 1, whereas the anchor groups of types 2 and 3 are obtained by reaction with hydroxylamine and with hydrazine, respectively. The procedures of the syntheses are presented in detail. The products are characterized by the degree of substitution and the content of the individual groups. The anchor groups are inverstigated by means of their 1H‐NMR spectra. The exchange properties are discussed.

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Chromatographische Methoden

Maier¹

1990

Lebensmittel- Und Umweltanalytik

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Spurenanalyse der Elemente: Anreicherung durch Austauscher und Sorbentien

Cited by 5 publications

References 129 publications

Sorption of Trace Elements or Radionuclides in Natural Systems Containing Groundwater and Sediments

Sorption of Trace Elements or Radionuclides in Natural Systems Containing Groundwater and Sediments

Syntheses of cellulose exchangers carrying chelating anchor groups for selective separation of uranyl ions

Chromatographische Methoden

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