Atmospheric Deposition Cation Method Detection Limits and Cation Analysis

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ADP flameAA cation Method Detection Limit results (SMQ 3/1/01)
K: 0.03ppm K trial (10 reps)
  • S.D. 0.003797 (2.821) 0.0107, MDL
  • 5x the MDL @0.05, this is the Practical Quantitation Limit
  • A new standard range of 0.05-0.5 ppm will need to be used
Mg: 0.01ppm Mg trial (10 reps)
  • S.D. 0.00135 (2.821) 0.0038, MDL
  • 5x the MDL @0.02, this is the Practical Quantitation Limit
  • The current standard range of 0.02-0.2 ppm will not change
Ca: 0.02ppm Ca trial (10 reps)
  • S.D. 0.006596 (2.821) 0.01967, MDL
  • 5x the MDL @ 0.1, this is the Practical Quantitation Limit
  • The current standard range of 0.5-5 ppm will not change
Na: 0.1ppm Ca trial (9 reps)
  • S.D. 0.004045 (2.896) 0.0117143, MDL
  • 5x the MDL @0.05, this is the Practical Quantitation Limit
The current standard range of 0.1-1 will not change
*For Na, this was a fairly conservative estimate, it may be possible to reduce the standards to a range of 0.05 0.5ppm.
Element, MDL, PQL, Std. Range
K, 0.01, 0.05, 0.05 - 0.5
Mg, 0.004, 0.02, 0.02 - 0.2
Ca, 0.02, 0.1, 0.5 - 5
Na, 0.01, 0.05, 0.1 - 1
Cation Analysis
Sample Preparation:
Rinse Nitric acid washed tubes with nanopure water before using then rinse with sample when pouring sample.
10ml of sample is about what is needed, 1/5-1/4 of a tube, for analyzing K and Na.
Add modifier to Ca and Mg before analysis. Pipet 4.5ml of sample twice and then add 1ml of 50,000 ppm La modifier for 10 ml of sample. This should be enough for both analyses. Add more in the same ratio if necessary.
BULK STANDARD:
Concentration, ml of 1000ppm std, Volume (ml) ml ultra HNO 3
2.0, 0.1, 50, 0.357
1.0, 0.1, 100, 0.714
0.5, 0.5, 100, 0.714
0.25, 0.025, 100, 0.714
0.1, 0.025, 250, 0.714
0.05, 0.025, 500, 0.714
0.025,0.025, 1000, 0.714
Quality Control Water Pollution QC
0.1 ml of QC in 100 ml volumetric flask with 0.714 ml of ultra HNO 3 .
Element, Concentration ppm
Ca, 0.5
Na, 0.5
Mg, 0.1
K, 0.1
Author(s): Nancy Grimm, Diane Hope,Cathy Kochert
Data Manager, Global Institute of Sustainability, Arizona State University,
POB 875402,TEMPE
 caplter.data@asu.edu 

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