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Appendix B
5/20/2009
3
preparation batch is composed of one to 20 environmental samples of the same
matrix, meeting the above mentioned criteria and with a maximum time between the
start of processing of the first and last sample in the batch to be 24 hours. An
analytical batch is composed of prepared environmental samples (extracts,
digestates, or concentrates) and/or those samples not requiring preparation, which are
analyzed together as a group using the same calibration curve or factor. An
analytical batch can include samples originating from various environmental
matrixes and can exceed 20 samples. (NELAC/EPA)
3.6.
Blank -
A sample that has not been exposed to the analyzed sample stream in order
to monitor contamination during sampling, transport, storage or analysis. The blank
is subjected to the usual analytical and measurement process to establish a zero
baseline or background value and is sometimes used to adjust or correct routine
analytical results. (ASQC)
3.7.
Blank
- Blank value = blank read minus blank zero. An indicator of the stability of
the system. (Exeter)
3.8.
Bridge
- Electrical configuration of the thermal conductivity filaments.(Exeter)
3.9.
Calibrate -
To determine, by measurement or comparison with a standard, the
correct value of each scale reading on a meter or other device, or the correct value
for each setting of a control knob. The levels of the applied calibration standard
should bracket the range of planned or expected sample measurements. (NELAC)
3.10.
Calibration -
The set of operations which establish, under specified
conditions, the relationship between values indicated by a measuring device. The
levels of the applied calibration standard should bracket the range of planned or
expected sample measurements. (NELAC)
3.11.
Calibration Method -
A defined technical procedure for performing a
calibration. (NELAC)
3.12.
Calibration Standard -
A substance or reference material used to calibrate an
instrument. (QAMS)
3.12.1.
Initial Calibration Standards (STD) -
A series of standard solutions used to
initially establish instrument calibration responses and develop calibration curves
for individual target analytes.
3.12.2.
Initial Calibration Verification (ICV) -
An individual standard, analyzed
initially, prior to any sample analysis, which verifies acceptability of the
calibration curve or previously established calibration curve.
3.12.3.
Continuing Calibration Verification (CCV) -
An individual standard which is
analyzed after every tenth field sample analysis.
3.13.
Capsule
- Aluminum container. Used for containing samples and standards
with an accurate weight and maintains integrity prior to combustion.
3.14.
Calibration Standard (CAL)
- An accurately weighed amount of a certified
chemical used to calibrate the instrument response with respect to analyte mass. For
this procedure the calibration standard is acetanilide, 99.9%+ purity.
3.15.
Certified Reference Material
-
A reference material one or more of whose
property values are certified by a technically valid procedure, accompanied by or
traceable to a certificate or other documentation which is issued by a certifying body.
(ISO 17025)