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Appendix B
5/20/2009
18
21
ATROPINE 2/29 N= 4.85 %
22
ATROPINE 2/29 C= 70.23 %
23
ATROPINE 3/3 N= 4.90 %
24
ATROPINE 3/3 C= 70.35 %
12.3.1. Cell 1A - Analysis date
12.3.2. Cell 2A – Analyst’s name
12.3.3. Cell 3A – Sample source or client
12.3.4. Cell 4A – Sample date
12.3.5. Cell 5A – Column heading for Sample
12.3.6. Cell 5B – Column heading for N concentration
12.3.7. Cell 5C - Column heading for C concentration.
12.3.8. Cells 5A to 11D – Sample Results table.
12.3.9. Cells 10 D and 11 D - % to indicate that BCSS-1 is reported in %N or C
12.1.10.Cells 12A to 15E – QC table for field duplicates. The mean of these values is
reported in the sample results table.
12.1.11.Cells 17A to 20F – Instrument values for the Blanks, and Ks.
12.1.12. Cells 21A to 24B- Values for LRB (atropine) for each day of analyses and
middle and end of analytical run.
12.2.
Sample data should be reported in units of mg/L as carbon or nitrogen for aqueous
samples, and as percent carbon or nitrogen for sediment samples.
12.3.
Report analyte concentrations to three significant figures for both aqueous and
sediment samples.
12.4.
For aqueous samples, calculate the sample concentration using the following
formula:
12.5.
For sediment samples, % N or %C are already calculated by the instrument
software.
13.
METHOD PERFORMANCE
13.1. The procedure validation MDL, based on seven filtrations of a sample, was
found to be 0.0633 mg/L for carbon and 0.0105 mg/L for nitrogen.
13.1.
Twenty analyses of the BCSS-1 Marine Sediment QC, from 7/2007 to 3/2008,
produced an average value of 2.13 +/- 0.4% C. The true value for the QC is 2.19
+/- 0.09% C. The true value for %N is not given, but the value obtained by our
procedure was 0.194 +/- 0.008%N.
13.2.
Forty analyses of the LRB (acetanilide), from 7/2007 to 3/2008, produced the
following values for carbon and nitrogen: The true value for carbon in acetanilide
is 71.09%. The average value over the time period was 70.35% ± 0.70%.
The
true value for nitrogen in acetanilide is 10.36%. The average value over the time
period was 10.31% ± 0.10%.
13.3.
Atropine became the standard used for LRB analyses as of 3/15/08. The true
value for carbon is 70.56%. The average value form 3/15-4/7/08 was 70.14 ±
0.42%. The true value for nitrogen in atropine is 4.84%. The average value for
the period was 4.92 ± 0.03%.