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

Silicon measurement in serum and urine by direct current plasma emission spectrometry

1990 ◽  
Vol 36 (8) ◽  
pp. 1460-1465 ◽  
Author(s):  
N B Roberts ◽  
P Williams
Keyword(s):  
Renal Failure ◽  
Chronic Renal Failure ◽  
Direct Current ◽  
Aluminum Toxicity ◽  
Renal Stones ◽  
Emission Spectrometry ◽  
Plasma Emission ◽  
Direct Current Plasma ◽  
Plasma Emission Spectrometry ◽  
Serum And Urine

Abstract Elemental silicon, present as soluble silicic acid in serum and urine, has been measured by direct current plasma emission spectrometry. The method is precise and accurate, yields a standard curve that is linear up to 1000 mumol/L, and requires only a simple dilution in 10 mL/L HNO3. No spectral or background interferences have been observed from serum or urine; the absolute detection limit for silicon was 0.5 mumol/L. Silicon concentrations in serum increase by up to 20-fold in patients with chronic renal failure on hemodialysis, an increase apparently related to dietary silicon intake. No relationship with aluminum was observed in hemodialysis patients, with or without aluminum toxicity. In the undialyzed patient with chronic renal failure, the concentrations of silicon in plasma increased with decreasing glomerular filtration rate. This increase may protect renal-failure patients from possible aluminum toxicity by promoting formation of the relatively inactive aluminosilicate complex. Silicon concentrations in urine of healthy individuals exceed their serum concentrations by 20- to 100-fold. Silicon excretion in patients with renal stones was not different from that in healthy controls and showed no relationship with calcium and (or) oxalate excretion.

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