In:
Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 42, No. 11 ( 1987-11-1), p. 1451-1460
Kurzfassung:
We synthesized a variety of colloidal and non-colloidal mixed hexacyanoferrate(II) complexes of Fe, Cu, Co, Ni, Zn, Mn and studied the cesium sorption in vitro under physiological conditions (artificial gastric juice. pH 1.2 and artificial duoden al juice. pH 6.8). All of the hexacyanoferrates under study (except cesium iron (III) hexacyanoferrate CsFeHCF) sorb tracer am ounts of 137 Cs quantitatively. Differences in the sorption capacity become obvious by offering substantial amounts of cesium . Potassium copper hexacyanoferrate(II) (KCuHCF) and potassium zinc hexacy an o ferrate(II) (KZnHCF) are most efficient in cesium sorption at pH 1.2 and at pH 6.8. The sorption capacities of KCuHCF and KZnHCF (2.3 -3.0 mmol Cs/g HCF) are twice as high as for colloidal Prussian blue (KFeHCF; 1.0-1.3 mmol Cs/g HCF) and insoluble Prussian blue (FeHCF; 1.0-1.6 mmol Cs/g HCF). The most promising compounds, KCuHCF and KZnHCF , should be further investigated in invivo studies for 137/134 cesium decorporation. Evidence indicate that the sorption mechanism for most of the compounds under study is a cesium /potassium ion-exchange reaction. In the case of insoluble Prussian blue (FeHCF), a cesium /proton exchange was observed. On laboratory scale, 137/134 Cs-contaminated whey dry powder, produced from South German cow milk in summer 1986 was almost completely decontaminated by dialysing a whey suspension against buffer solution containing FeHCF. The 137/134 Cs + -ions, completely bound by FeHCF can be isolated from the buffer solution by simple filtration. The buffer solution and the FeHCF can be re-used several times.
Materialart:
Online-Ressource
ISSN:
1865-7117
,
0932-0776
DOI:
10.1515/znb-1987-1114
Sprache:
Englisch
Verlag:
Walter de Gruyter GmbH
Publikationsdatum:
1987
ZDB Id:
2078109-X
ZDB Id:
124635-5
