Basic HTML Version
Appendix C
5/20/2009
11
9.4.4
0.09 X STD conc.
9.4.5
5.0 ml sample
5.0/5.5 = 0.91
9.4.6
(original sample conc. X 0.91) + (0.09 x std conc.) =
(expected conc.) mg/L
9.5 Data Assessment and Acceptance Criteria for Quality Control Measures
9.5.1 The Acceptance Criteria for DOC is 0.9990. If the r
2
is less
than acceptable, all blanks and standards analyzed during the run
may be averaged into the curve.
9.6 Corrective Actions for Out of Control Data
9.6.1 If the acceptance criteria are still not met, the samples are
to be rerun.
10
CALIBRATION AND STANDARDIZATION
10.1
Calibration – Daily calibration must be performed before sample
analysis may begin. Four point calibration is used with the Shimadzu
TOC 5000/5000A.
10.1.1
Type I water is used as the “zero point” in the calibration.
Because even Type I water contains some organic carbon,
the area count response is subtracted from the standards as
the water blank, forcing the curve through zero. The
standards are calculated by the following equation:
mg TOC/L = (A
STD
– A
H2OBLK
)/ m
Where:
A
STD
= Area of the standard
A
H2OBLK
= Area of water blank
m = slope of the regression line
TOC sample concentration is calculated using the following equation:
mg TOC/L = (A
S
-
|
b
|
)/ m
Where:
A
S
= area of the sample,
b = y-intercept, and
m = slope of the regression line