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Table 3. Percent Accuracy of Surrogate Predictions for Various Matrices and Method Detection Limits (MDL) in Parts per Billion

Table 3. Percent Accuracy of Surrogate Predictions for Various Matrices and Method Detection Limits (MDL) in Parts per Billiona
  Waterb Soilc Oild
Analyte Group
Volatile
Gases		 111 ± 18 5 to 35 1  0.5 to 5.2 97 ± 6 18 to 28 8 0.6 to 5 99 ± 14 8 to 31 36 7 to 66
Volatiles 100 ± 2 0 to 10 1  0.1 to 1.0 98 ± 5 0 to 20 3 0.1 to 0.7 97 ± 10 2 to 70 35 0.1 to 14
Solubles 95 ± 11 1 to 70 17   0.4 to 40 113 ± 78 2 to 300 9 1 to 6 108 ± 15 3 to 150 34 4 to 35
Neutral Semivolatiles 102 ± 17 1 to 40 2  0.2 to 0.7 98 ± 8 2 to 13 7 0.2 to 1.2 81 ± 23 18 to 60 42 1 to 30
Basic Semivolatiles 132 ± 5 9 to 37 40 22 to 33 115 ± 9 7 to 19 19 11 to 27 81 ± 32 4 to 150 17 300 to 500
Marginal
Analytes		 87 ± 27 8 to 24 87 3 to 36 120 ± 69 5 to 61 31 1 to 100 61 ± 48 3 to 24 146 36

a Method detection limits are equal to 3 times the average standard deviation (1 sigma) of 3 sets of 7 replicate analyses performed on three nonconsecutive days.
b 5-mL water samples.
c 5-g soil samples (vacuum spike, Soil #3).
d 1-g oil samples (vacuum spike, cod liver oil).
e The group average (± 1 sigma) of all analytes contained in the analyte group. Accuracy of each analyte was determined using 3 to 4 replicates.
f The range of individual analyte standard deviations (1 sigma) of the replicate analyses by analyte group.
g The group average variation between predictions of the surrogate pairs for the replicate analyses.
h The range of analyte MDLs within the analyte group.

 

 


 

National Exposure Research Laboratory
Author:  Mike Hiatt
Email:  Hiatt.Mike@epa.gov or Pia.Stephen@epa.gov
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