Laboratory Quality Control Sample - Blank Spike

Created by: Andrew White

Modified on: Tue, 7 May, 2019 at 1:03 PM


Blank Spike

A laboratory control sample free of the target analytes or interference, is fortified with a known concentration of all or selected target analytes.  The blank spike is processed through the entire analytical method including any extraction, digestion or any other preparation procedure.  Results are expressed as a percentage recovery.


Frequency and Purpose


Optional control measure.  Ideally 1 per batch run.


Monitors analyte recovery and potential loss during the preparation procedures (extraction efficiency).  It also serves to validate the calibration of the instrumentation technique.


Application and Regulatory Criteria


Used for most analytical parameters.


Acceptable recovery ranges:

EC, Salinity
90% - 110% water; 80% - 120% soil
Metals and Inorganics
80% - 120%; HWS B 70% - 130%
FOC, Methyl Mercury
70% - 130% (all matrices)
VOCs, THMs, BTEX except gases and ketones
60% - 130% (water and soil)
PHCs
60% - 140% (water and soil)
CPs, PFOS, PAHs, PCBs, Volatile Gases & Ketones
50% - 140% (water and soil)
30% - 130% for difficult compounds
Dioxins & Furans
70% - 140% (water and soil)
1,4-Dioxane
70% - 130% waters; 60% - 140% soils


Recommended Actions

Bureau Veritas Laboratories recommends using the acceptable recovery ranges listed above (adopted from CCME Analytical protocols).  Re-extract/re-analyse all associated samples, if possible.  If not, report the data flagged for all failing analytes,  Re-analysis is performed if the laboratory control sample (LCS) in a single analyte test or >10% of the analytes in a multi-element scan are outside the control limits by >10% absolute.


 




 


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Andrew is the author of this solution article.

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