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Trace Impurities in Phosphor Grade CaWO4- A D.C. Arc Spectrographic Method

 

作者: M.J. Kamat,   V. Sugandhi,   T.R. Saranathan,  

 

期刊: Analytical Letters  （Taylor Available online 1981）
卷期: Volume 14, issue 12  

页码: 933-946

 

ISSN:0003-2719

 

年代: 1981

 

DOI:10.1080/00032718108055491

 

出版商: Taylor & Francis Group

 

关键词: mission Spectroscopy;Calcium Tungstate;Phosphor;Trace Impurities

 

数据来源: Taylor

 

摘要:

A simple d.c. are emission spectrographic method is described for the determination of 12 trace impurities in phosphor grade CaWO4in the range 5 to 250 ppm. A charge of 25 mgs containing sample mixed with graphite in the ratio 1:3 is excited in a 10 amp d.c. arc. Scandium is used as the internal standard. The precision of the method is ± 15%. Detailed discussion on the selection of the final parameters has been given with supporting data.

 

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