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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...

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...

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...

Laboratory Duplicates A second aliquot from a randomly chosen sample within an analytical batch processed through the entire analytical method. Laborat...

Laboratory Reference Samples Purchased or prepared samples that have been certified by a recognized agency to contain specified levels of selected constitu...

Surrogate Recovery Surrogates are deuterated analogues or compounds not normally found in nature but have chemical and physical behaviour similar to the an...

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...

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...

Trip Blank - a sample of analyte free media supplied by the analyzing laboratory taken to the site and returned to the laboratory unopened.   The trip bla...

Matrix interference could include compounds directly affecting instrument sensitivity.  It could also be target or non-target compounds masking the signal o...