22541-46-4

Basic information

• Product Name: americium(3+)
• CAS NO: 22541-46-4
• Molecular Formula: Am
• Molecular Weight: 243.0597
• Mol File: 22541-46-4.mol
• Article Data: 6

Chemical Properties

• CAS DataBase Reference: americium(3+)(CAS DataBase Reference)
• NIST Chemistry Reference: americium(3+)(22541-46-4)
• EPA Substance Registry System: americium(3+)(22541-46-4)

Safety Data

• Hazardous Substances Data: 22541-46-4(Hazardous Substances Data)

Upstream product

• 22878-02-0 AmO₂⁽¹⁺⁾ 
• 12323-66-9 AmO₂⁽²⁺⁾ 
• 12254-53-4 Americium(IV) hydroxide 

Relevant articles and documents

Preparation and properties of americium(VI) in aqueous carbonate solutions

Hexavalent americium is conveniently prepared as a soluble, red-brown complex in aqueous Na2CO3 or NaHCO3 by O3 or S2O8-2 oxidation of americium in lower valence states. The solutions in 0.1 to 0.5 M NaHCO3 are stable at 90° to reduction by H2O, Cl-, and Br-, but are readily reduced by I-, N2H4, H2O2, NO2-, and NH2OH. Reduction by water occurs at 90° in 2 M Na2CO3. The spectra of Am(VI) in the 500-1300 mμ region are markedly different in carbonate solutions than in acid. The infrared spectra of solid sodium americyl(VI) carbonates establish the presence of the O-Am-O group in the carbonate complex. Based on the properties of Am(VI) in carbonate solution, a new procedure for the preparation of Am(V) free from traces of Am(III) and a useful process for the separation of americium and curium are reported.

Investigation of 137Cs+, 85Sr2+ and 241Am3+ ion exchange on thorium phosphate hydrogenphosphate and their immobilization in the thorium phosphate diphosphate

Thorium phosphate diphosphate (TPD) has been proposed as a host matrix for the long-term storage of tetravalent actinides such as U(IV), Np(IV) and Pu(IV), which form solid solutions with TPD. Small amounts of di- or trivalent cations can also be immobilized in this matrix. Another method of loading of TPD, using the ion-exchange properties of thorium phosphate hydrogenphosphate (TPHP), a precursor of TPD, was applied to 137Cs+, 85Sr2+ and 241Am3+. The adsorption of these cations on TPHP was studied in terms of pH in NaClO4 and NaNO3 media. The ion-exchange process on TPHP was found to be reversible for 85Sr2+ and 241Am3+. Doped TPHP obtained in this way was heated at 1050°C until TPD was formed. Several leaching tests were performed in acidic media on TPD doped with radionuclides with ionic strength equal to 0.1 M. The average partial order related to the proton was found to be equal to 0.24 ± 0.10 and the normalized leaching rate constant was in the range of 3 × 10-6 to 2 × 10-5 gm-2 d-1. These results are similar to those obtained for thorium plutonium(IV) phosphate diphosphate solid solutions. On the basis of the results obtained from the adsorption and leaching studies, this adsorption-immobilization process, based on the TPHP matrix, can be proposed for the decontamination of low level radioactive liquid wastes.