Draft Data Validation Plan Review Form Page 26
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29Draft Data Validation PRF-Tier II
Date: March 2, 2004
Page 26
Revision: 4.0
2.0
ICP Metals Data Review - Interference Check Samples (ICS)
2.2
Are the results of the AB standard within control limits of
80% - 120%?
Note: The Tier II Data Validator should verify one of the
percent recovery (%R) calculations (%R = found/true X100).
Action: If the results fall outside of the acceptance criteria, the
Tier II Data Validator should use professional judgement to
qualify positive or non-detected data as either estimated or
rejected. The number of analytes outside of the criteria, the
magnitude of the deviations and other relevant information should
be used for this judgement.
2.3
Are concentrations of interfering metals (e.g., Al, Ca,
Fe, and Mg) in samples comparable or greater than
concentrations in the ICS?
Note: The concentration of the these elements may not be
reported. If not, additional information may be requested
from the laboratory.
Action: If the ICS recovery for an element is greater than 120%,
and the sample results are less than the detection limit, the data
is acceptable and shouldn’t be qualified.
If the ICS recovery for an element is greater than 120%, and the
results are greater than the detection limit, qualify all the affected
data as “J.”
If the ICS recovery for an element falls between 50% and 79%
and the sample results are greater than the detection limit, qualify
the affected data as “J.” If the results are less than the detection
limit, qualify these results as “UJ.”
If the ICS recovery for an element is less than 50%, qualify the
affected data as “R.”
2.4
Are results greater than the detection limit for elements
which aren’t in the ICS solution? If yes, the possibility
of a false positive exists.
Action:
For samples with comparable or higher levels of
interferents and with analyte concentrations that approximate
those levels found in the ICS (false positives), qualify sample
results greater than the detection limit as “J.”
2.5
Are negative results observed for elements that are not
present in the ICS solution, and is their absolute value
greater than the detection limit? If so, the possibility of
false negatives in the samples may exist.
Action: For samples with comparable or higher levels of
interferents, qualify results for the affected analytes less than the
detection limit as “UJ.”
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