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Appendix D
5/20/2009
2
3.5
Batch – Environmental samples, which are prepared and /or analyzed
together with the same process and personnel, using the same lot(s) of
reagents. A
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 matrices 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
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)
3.8
Calibration – The set if 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)
3.9
Calibration Curve – The graphical relationship between known values,
such as concentrations, or a series of calibration standards and their
analytical response. (NELAC)
3.10
Calibration Method – A defined technical procedure for performing a
calibration. (NELAC)
3.11
Calibration Standard – A substance or reference material used to
calibrate an instrument. (QAMS)
3.11.1
Initial Calibration Standard (STD) – A series of standard
solutions used to initially establish instrument calibration
responses and develop calibration curves for individual target
analytes.
3.11.2
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.
3.11.3
Continuing Calibration Verification (CCV) – An individual
standard which is analyzed after every 10-15 field sample
analysis.