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Sampling and Analysis |
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| Data Validation
and Interpretation |
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When an employee is sampled and the results analyzed, the measured exposure will rarely be the same as the true exposure. This
variation is due to sampling and analytical errors (SAE's). The total error depends on the combined effects of the contributing errors inherent in
sampling, analysis, and pump flow.
Consider the following questions when analyzing results:
- Do the results make sense?
- Based on knowledge of the
sampling site, are the laboratory results consistent with what you expect?
- And are they
consistent between samples?
- Are the results consistent with previous sampling results?
- If an error in analytical procedures or results is suspected, contact the laboratory
quality assurance section for assistance and resolution.
- Were the samples collected using the correct sampling method and were the method
specifications followed?
- Was the correct sampling media used?
- Were the sample flow rates and total volumes within specifications?
- Were samples properly preserved and shipped?
- Was there a possibility of contamination? Were blanks submitted for analysis?
- Were there any unusual circumstances surrounding the sample collection which may
influence the validity?
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