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Quality Assurance

TermDefinition
raw data mesurements
treated data worked up data (found concentrations, graph) -may exclude outliers
results final values and interpretations
false positive returns a positive result when it should be negative
false negative returns a negative result when it should be positive
Blank sample has no analyte
reagent blank contains all other reagents other than the analyte
method blank reagent blank that has bene run through all the processing steps of the procedure
field blank method blank includimg similar environmental exposure to the analysis samples
sample matirx rest of the sample other than the analyte -ex. DI water or ocean water
spike -signal change based on analyte added to a sample
selectivity what the method responds to, whether is it just the analyte or other things as well.
accuracy how close you are to the correct answer
Precision how close your values are to each other
reproducibility within your data, similarity between each run or from day to day
repeatability similarity of results between diferent analysis' or labs
Dynamic range concentration range of analyte where precise within acceptable limits
Working range including limitations of sample prep or lab capability (not just instrument response or theoretical limits)
Limit of Linearity (LOL) upper bound where instrument response stops being linear
sensitivity how reactive the instument is due to analyte change
Limit of detection (LOD) lowest amount of analyte we can reliably detect
Limit of quanitification lowets amount of analyte we can reliably quantify
Reporting limit minimum concentration- below this, amount recorded as 0
Robustness ability of the method to withstand small variations in conditions and still give acceptable results
Internal standard similar to but not the analyte (ex. using F- when measuring Cl-)
Standard addition constant amount of unknown sample is added to the standards in a concentration series
Created by: zoey.stevenson
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