Non-alkali metal interferences in the determination of platinum group metals by d.c. plasma emission spectrometry

1985 ◽  
Vol 40 (1-2) ◽  
pp. 287-291 ◽  
Author(s):  
Roberta L. Fox
Keyword(s):  
Alkali Metal ◽  
Platinum Group Metals ◽  
Emission Spectrometry ◽  
Plasma Emission ◽  
Plasma Emission Spectrometry ◽  
Platinum Group

Enhancement Errors in the Determination of Platinum Group Metals in Alumina-Based Matrices by Direct-Current Plasma Emission Spectrometry

1984 ◽  
Vol 38 (5) ◽  
pp. 644-647 ◽  
Author(s):  
Roberta L. Fox
Keyword(s):  
Direct Current ◽  
Platinum Group Metals ◽  
Emission Spectrometry ◽  
Spectrometric Analysis ◽  
Enhancement Effect ◽  
Plasma Emission ◽  
Direct Current Plasma ◽  
Plasma Emission Spectrometry ◽  
Platinum Group

Direct-current plasma emission spectrometric analysis of platinum group metals in solutions from automobile catalyst shows significant enhancement of analyte values Addition of a lithium buffer does not remove the interference The only matrix constituents in these solutions were aluminum and magnesium, both of which were found to cause enhancement in the determination of platinum, palladium, and rhodium A buffer consisting of 3500 mg/L lithium and 2500 mg/L lanthanum removed the enhancement effect of both magnesium and aluminum on these metals 8-hydroxyquinoline also reduced the degree of interference due to aluminum, although not as efficiently as lanthanum, indicating that formation of compounds in the dc plasma is a possible source for the observed interference

Argon Plasma Emission Spectrometry of Uranium in Phosphatic Materials

1983 ◽  
Vol 66 (4) ◽  
pp. 949-951
Author(s):  
J D Norman ◽  
Louis A Stumpe ◽  
Joe R Trimm ◽  
Frank J Johnson
Keyword(s):  
Argon Plasma ◽  
Sample Pretreatment ◽  
Trioctylphosphine Oxide ◽  
Emission Spectrometry ◽  
Plasma Emission ◽  
Plasma Emission Spectrometry ◽  
Hydrochloric Acid Solutions ◽  
System 2 ◽  
Back Extract

Abstract A method is described for the determination of uranium by using a dc argon plasma emission spectrometer. Problems and interferences found in the method previously reported are overcome by using an improved sample pretreatment. A new synergistic system, 2% oxalic acid adjusted to pH 4.5 with triethanolamine, is used to quantitatively back-extract uranium from trioctylphosphine oxide in cyclohexane. This improved method yields excellent results for >1 ppm uranium in nitric and hydrochloric acid solutions of phosphate rocks, phosphoric acids, phosphate fertilizers, phosphogypsums, organic phosphates, and waste solutions. Recovery data are given for synthetic and certified standards.

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