Spectrographic method for the determination of rare earths in plutonium—use of trilaurylamine

1970 ◽  
Vol 50 (2) ◽  
pp. 237-242 ◽  
Author(s):  
R.K. Dhumwad ◽  
M.V. Joshi ◽  
A.B. Patwardhan
Keyword(s):  
Rare Earths ◽  
Spectrographic Method

Chemical Separation and Spectrographic Determination of Trace Amounts of Rare Earths in Uranium Using LiF—AgCl Carrier

1970 ◽  
Vol 24 (6) ◽  
pp. 573-576 ◽  
Author(s):  
B. D. Joshi ◽  
B. M. Patel
Keyword(s):  
Powder Mixture ◽  
Rare Earths ◽  
Coefficient Of Variation ◽  
Internal Standard ◽  
Chemical Separation ◽  
Graphite Powder ◽  
Spectrographic Determination ◽  
Spectrographic Method ◽  
Dc Arc

An emission spectrographic method is described for the determination of certain rare earths—Ce, Sm, Eu, Gd, Dy, Ho, Er, Yb, and Lu—at fractions of ppm concentration in uranium samples using LiF-AgCl-graphite powder mixture as carrier. The rare earths chemically separated from uranium were excited in a dc arc. Thulium was used as an internal standard. The detection limits in ppm on the basis of 5 g uranium sample are: Yb 0.004; Eu, Gd, Er 0.02; Dy, Lu 0.05; Sm, Ho, 0.2; and Ce 0.5. The precision of the method expressed as a coefficient of variation is estimated to be ±9%. The effect of 14 nonrare earth elements on the intensity of analysis lines was investigated.

Determination of neodymium, holmium and erbium in mixed rare earths by norfloxacin

1998 ◽  
Vol 361 (8) ◽  
pp. 821-824 ◽  
Author(s):  
Nai-Xing Wang ◽  
Lei Wang ◽  
Wei Jiang ◽  
Yue-Zhen Ren ◽  
Zhi-Kun Si ◽  
...  
Keyword(s):  
Rare Earths

Determination of Trace Elements in Opium by Means of Activation Analysis

1963 ◽  
Vol 1 (3) ◽  
Author(s):  
Alexis C. Pappas ◽  
Jorolf Alstad ◽  
Gulbrand Lunde
Keyword(s):  
Trace Elements ◽  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Rare Earths ◽  
Gold Content ◽  
The Individual ◽  
Lanthanide Content ◽  
Different Origin

SummaryMany methods have been advocated for the determination of the origin of opium, but so far no research has been reported on the possibilities of such studies by means of radiochemical methods applied to the opium ash.In the present investigation the gold and lanthanide content in samples of opium ash has been studied using neutron activation analysis. The gold content was found to vary from about 0,5 to 10 ppm and the total rare earths content from about 20 to 150 ppm. Large variations are found in the distribution pattern of the individual rare earths in opium samples from different origin. The results are discussed and indicate that activation analysis may be used to indentify the origin of opium samples.

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