Data Quality - QA/QC

Laboratory Quality Control Sample - Method Blank
Method Blank A method blank is a laboratory control sample that is free of the target parameters and any substances that may interfere with that analysi...
Wed, 19 Dec, 2018 at 6:58 AM
Laboratory Quality Control Sample - Blank Spike
Blank Spike A laboratory control sample free of the target analytes or interference, is fortified with a known concentration of all or selected target anal...
Tue, 7 May, 2019 at 1:03 PM
Laboratory Quality Control Sample - Matrix Spike
Matrix Spike A second aliquot from a randomly chosen sample is fortified with a known concentration of target analytes. The sample is processed through the...
Tue, 7 May, 2019 at 1:04 PM
Laboratory Quality Control Sample - Duplicates and RPD
Laboratory Duplicates A second aliquot from a randomly chosen sample within an analytical batch processed through the entire analytical method. Laborat...
Tue, 7 May, 2019 at 1:09 PM
Laboratory Quality Control Sample - Laboratory Reference Samples & Certified Reference Material
Laboratory Reference Samples Purchased or prepared samples that have been certified by a recognized agency to contain specified levels of selected constitu...
Thu, 20 Dec, 2018 at 6:51 AM
Laboratory Quality Control - Surrogate Recovery
Surrogate Recovery Surrogates are deuterated analogues or compounds not normally found in nature but have chemical and physical behaviour similar to the an...
Tue, 7 May, 2019 at 1:09 PM
Calculating Relative Percent Difference (RPD)
One of the most commonly used estimates of precision is the relative percent difference or RPD between two samples.  In typical sampling situations a second...
Tue, 18 Dec, 2018 at 9:59 AM
Field Quality Control Sample - Blind Duplicates
A Blind Duplicate is a second sample collected at the same time and location, under the same conditions and submitted in separate containers. Samples ar...
Wed, 19 Dec, 2018 at 7:00 AM
Field Quality Control Sample - Trip Blank
Trip Blank A sample of analyte free media (supplied by the laboratory) taken to the site and returned to the laboratory unopened.  The trip blank as well a...
Wed, 19 Dec, 2018 at 11:55 AM
Detection limits raised due to matrix interference.
Matrix interference could include compounds directly affecting instrument sensitivity.  It could also be target or non-target compounds masking the signal o...
Tue, 7 May, 2019 at 11:05 AM