A purchased CRM / LCS or a sample previously analysed by an accredited laboratory multiple time, is submitted to the laboratory blind (without laboratory knowing).
Frequency and Purpose
Optional. 1 per remediation or large project. Evaluates laboratory accuracy and precision.
Application and Regulatory Criteria
Ideal for long holding time test such as metals in soil. Submission of the same blind known multiple times during a large project provides excellent monitoring of the laboratory precision and accuracy. Acceptable recovery ranges are provided by the supplier.
Recommended Actions
Contact the laboratory if recovery results are outside the recommended ranges.