Chemistry 155 Introduction to Instrumental Analytical Chemistry

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Chem 155 Unit 1 Page 28 of 3131.8.3 Dynamic RangeLOQ = Limit of Quantitation (σ S /S ≈ 0.3)LOL = Limit of LinearityBetween LOQ and LOL your instrument is mostuseful!This is called:Linear Dynamic RangePage 28 of 313
Chem 155 Unit 1 Page 29 of 3131.8.4 SelectivitySometimes another chemical species will add to orsubtract from your analyte signal –S = m A C A + m B C B + m C C C + m D C D + … + S BAnalyte Interferants BlankSelectivity coefficients determine how serious aninterferant is to your determination of analyte C A :k B,A = m B /m A ,k C,A = m C /m A , etc…So:S = m A (C A + k B,A C B + k C,A C C + …) + S BPage 29 of 313
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Chemistry 155 Introduction to Instrumental Analytical Chemistry

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