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CH3041
ANALYTICAL CONCERNS
Sensitivity
of the method:
This is determined for the overall method by the MDL.
eg. DDT analysis from soil samples using solvent extraction, SPE and GC-ECD
MDL: 2ppb using 100g of soil.
This is determined for the overall method by the MDL.
eg. DDT analysis from soil samples using solvent extraction, SPE and GC-ECD
MDL: 2ppb using 100g of soil.
Selectivity:
False positives are a constant problem in environmental analysis. Selectivity refers to the ability of a technique to discriminate between analytes.
False positives are a constant problem in environmental analysis. Selectivity refers to the ability of a technique to discriminate between analytes.
• For instance the
fluoride electrode that is commonly
used to measure F- in domestic water the electrode also responds to OH-.
selectivity coefficient: kOH-,F- = 0.1
selectivity coefficient: kOH-,F- = 0.1
