Basic HTML Version
Appendix B
5/20/2009
4
3.16.
Combustion Time
- Time for sample to fully combust in an oxygen
environment.
3.17.
Combustion Tube
- Quartz tube packed with reagents and used for sample
combustion.
3.18.
Conditioner
- A standard chemical which is not necessarily accurately
weighed that is used to coat the surfaces of the instrument with the analytes (water
vapor, carbon dioxide, and nitrogen).
3.19.
Corrective Action -
Action taken to eliminate the causes of an existing
nonconformity, defect or other undesirable situation in order to prevent recurrence.
(ISO 8402)
3.20.
Deficiency -
An unauthorized deviation from acceptable procedures or
practices. (ASQC)
3.21.
Demonstration of Capability -
A procedure to establish the ability of the
analyst to generate acceptable accuracy. (NELAC)
3.22.
Detection Limit -
The lowest concentration or amount of the target analyte
that can be determined to be different from zero by a single measurement at a stated
degree of confidence.
3.23.
Detector
- The heart of the analyzer consisting of three bridges. Determines
the percentages of carbon, hydrogen, and nitrogen in the sample via thermal
conductivity.
3.24.
Detector Oven
- Keeps the temperature of the detector, pressure transducer,
mixing volume, and sample volume constant.
3.25.
Double Drop
- Two samples are dropped for one run - used for filter and
inorganic applications. Sample requires a + prefix.
3.26.
Duplicate Analyses -
The analyses or measurements of the variable of
interest performed identically on two sub samples (aliquots) of the same sample.
The results from duplicate analyses are used to evaluate analytical or measurement
precision but not the precision of sampling, preservation or storage internal to the
laboratory (EPA-QAD)
3.27.
External Standard (ES)
- A pure analyte (atropine) that is measured in an
experiment separate from the experiment used to measure the analyte(s) in the
sample. The signal observed for a known quantity of the pure external standard is
used to calibrate the instrument response for the corresponding analyte(s). The
instrument response is used to calculate the concentrations of the analyte(s) in the
unknown sample.
3.28.
Field Duplicates (FD1 and FD2)
- Two separate samples collected at the
same time and place under identical circumstances and treated exactly the same
throughout field and laboratory procedures. Analyses of FD1 and FD2 give a
measure of the precision associated with sample collection, preservation and storage,
as well as with laboratory procedures.
3.29.
Fill Time
- Time required to build-up the pressure in the mixing volume to
1500 mm Hg.
3.30.
Filtered Sample
–
An accurately measured amount of water from fresh,
estuarine or coastal samples, filtered through a 25 mm Whatman GF/F filter or
equivalent, which has been precombusted at 500
o
C for 90 minutes.
3.31.
Furnace
- Heats the reduction and combustion tubes to operating temperature.