Basic HTML Version
Appendix B
5/20/2009
6
3.48.
Method Detection Limit (MDL)
- The minimum concentration of an analyte
that can be identified, measured, and reported with 98% confidence that the analyte
concentration is greater than zero.
3.49.
Mixing Volume
- Spherical bottle in which sample gases become
homogenous.
3.50.
Mother Board
- The main printed circuit board. All CE 440 power supplies
are located here.
3.51.
Must -
Denotes a requirement that must be met. (Random House College
Dictionary)
3.52.
Precision -
The degree to which a set of observations or measurements of the
same property, obtained under similar conditions, conform to themselves; a data
quality indicator. Precision is usually expressed as standard deviation, variance or
range, in either absolute or relative terms. (NELAC)
3.53.
Preservation –
Refrigeration, freezing and/or reagents added at the time of
sample collection (or later) to maintain the chemical and or biological integrity of the
sample.
3.54.
Pressure Transducer
- Used to check for leaks in the system and to monitor
pressure in the mixing volume.
3.55.
P Valve
- The valve on the injector box of the horizontal auto-injector (HA)
used to automatically purge the box.
3.56.
Profile
- Generated by the bridge signal. Used to help determine if a leak or
malfunction occurs in the system.
3.57.
Quality Control Sample (QCS)
- A sample of analytes of known and
certified concentrations. The QCS is obtained from a source external to the
laboratory and different from the source of calibration standards. It is used to check
laboratory performance with externally prepared test materials.
3.58.
Reduction Tube
- Quartz tube with reduced copper that removes excess
oxygen from the sample gas and reduces oxides of nitrogen to free nitrogen.
3.59.
Response Factor (RF)
- The ratio of the response of the instrument to a
known amount of analyte.
3.60.
Run
- One sample analysis from start to finish, including printout.
3.61.
Run Cycle
- Typically a day or half day of operation - the entire analytical
sequence of runs from the first run to the last run on the Sample Wheel.
3.62.
Sample Volume
- Tube where sample gas is exhausted from the mixing
volume prior to entering the detector.
3.63.
Sample Wheel
–
Sample holding device which contains up to 64 blanks,
standards and samples. One wheel equals roughly 6 hours of run time, which is
called the Run Cycle.
3.64.
Scrubber
- Removes water and CO
2
from the gas supplies.
3.65.
Sediment (or Soil) Sample
- A fluvial, sand, or humic sample matrix exposed
to a marine, estuarine or fresh water environment.
3.66.
Sensitivity -
The capability of a test method or instrument to discriminate
between measurement responses representing different levels (concentrations) of a
variable of interest.
3.67.
Shall -
Denotes a requirement that is mandatory whenever the criterion for
conformance with the specification requires that there be no deviation. (ANSI)