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Appendix J: Example of Determining Uncertainty Using Replicates

Table A12: Summary of duplicated samples
Sample Concentrations (mg/kg)
Arsenic Copper Lead
A 71 215 183
A2 72 206 182
Mean 71.5 210.5 182.5
B 52 180 181
B2 59 174 204
Mean 55.5 177 192.5
C 17 43 70.1
C2 20 49 73.6
Mean 18.5 46 71.85
D 42 127 84.2
D2 48 137 96.1
Mean 45 132 90.15

 

Table A13: Extracted precision data 11

 

View extracted precision data (large table)

 


11 This method assumes that samples themselves were replicated at each location, so that the variation measured represents the sum of analytical and sampling variation.

 

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Last updated: 19 October 2011