Spectral determination of rare earth elements in solutions using a hollow-cathode discharge in a magnetic field

1978 ◽  
Vol 29 (5) ◽  
pp. 1394-1396
Author(s):  
N. K. Rudnevskii ◽  
D. E. Maksimov ◽  
L. P. Lazareva
Keyword(s):  
Magnetic Field ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Hollow Cathode ◽  
Hollow Cathode Discharge ◽  
Spectral Determination

Spectral determination of certain impurities in semiconductor germanium using a hollow-cathode discharge

1969 ◽  
Vol 11 (5) ◽  
pp. 1284-1286
Author(s):  
N. K. Rudnevskii ◽  
A. N. Tumanova ◽  
D. E. Maksimov ◽  
L. V. Lomzilova
Keyword(s):  
Hollow Cathode ◽  
Hollow Cathode Discharge ◽  
Spectral Determination

The fluorimetric determination of cerium and terbium

1989 ◽  
Vol 54 (3) ◽  
pp. 616-621 ◽  
Author(s):  
Záviš Holzbecher
Keyword(s):  
Rare Earth ◽  
Detection Limit ◽  
Rare Earth Elements ◽  
Fluorimetric Determination ◽  
Fluorescence Maximum ◽  
Relative Standard ◽  
And Shifts ◽  
Hcl Medium ◽  
Fold Excess

It has been found that phosphoric acid decreases the first excitation maximum of Ce(III) at 256 nm, increases the second excitation maximum at 297 nm and shifts the fluorescence maximum from 350 to 346 nm. Under optimum conditions, with λexc = 297 nm and λem = 346 nm, Ce(III) can be determined fluorimetrically with a detection limit of 1.2 ng ml-1 in 12M-H3PO4 medium. No interference was observed from a 20-200 fold excess of HCl, H2SO4, Na, K, NH4+, Al and the rare earth elements. HNO3 interferes and Ce(IV) and Fe(III) interfere strongly. It follows from the stereofluorograms of Ce and Tb that the spectra of the two elements are practically independent. The detection limit for Tb(III) in 0.02-2.5M-H2SO4 medium for λexc = 222 nm and λem = 494 nm is 33 ng ml-1. No interference was observed from a 5-20 fold excess of Al3+ and the other rare earth elements. The determination is slightly less sensitive in H3PO4 or HCl medium. The relative standard deviation of the measurement for 10 ng ml-1 Ce(III) or 50 ng ml-1 Tb(III) is about 3%.

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