Table T8. Estimates of accuracy and precision for Carlo Erba gas chromatography analyses of CO2, H2O, and S.
Standard
Date (2003)
Volatiles
CO2
(wt%)
H2O
(wt%)
S
(ppm)
JP-1 23 May 0.31 3.04

27 May
2.39

28 May 0.30 2.94

31 May 0.29 2.73

5 Jun 0.30 2.95

10 Jun 0.33 3.05

13 Jun 0.33 3.21

16 Jun 0.32 2.43

21 Jun 0.36 2.32
Average (wt%): 0.32 2.79
Preferred value (wt%):
3
Standard deviation (wt%): 0.02 0.33
Precision (%): 7.00 11.74
Accuracy (%): NA 0.55
BAS140 23 May 0.12 1.20 841

27 May
1.42

28 May 0.12 1.05 1237

31 May 0.11 1.06 929

5 Jun 0.11 1.12 546

10 Jun 0.13 1.16 1479

13 Jun 0.11 1.26 628

16 Jun 0.13 1.93 493

21 Jun 0.16 1.78 581
Average (wt%): 0.12 1.33 842
Preferred value (wt%): 0.05 1.12 900
Standard deviation (wt%): 0.02 0.32 357
Precision (%): 12.86 24.00 42.42
Accuracy (%): 58.79 15.90 –6.93
147-895D-10W 23 May 0.98 10.76

27 May 0.88 10.43

28 May 1.08 11.03

31 May 1.05 11.33

5 Jun 0.92 11.66

10 Jun 1.41 11.36

13 Jun 1.09 13.78

16 Jun 0.97 9.99

21 Jun 1.14 11.14
Average (wt%): 1.06 11.28
Preferred value (wt%): 0.95 9.62 600
Standard deviation (wt%): 0.16 1.07
Precision (%): 14.84 9.48
Accuracy (%): 11.24 17.23

Notes: Preferred values: BAS140 (Sparks and Zuleger, 1995), JP-1 (Sims et al., 1988), and 147-895D-10W (Puchelt et al, 1996). NA = not applicable (no preferred value). This table is also available in ASCII.