Chem 287_Chapter 5

Chem 287_Chapter 5 - Lectures: Classical Methods of...

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Lectures: Classical Methods of Chemical Analysis 1 Analytical Chemistry Chapter 5 Pages: 107-120 Problems: 8,10,11,17 To be covered: 1) Standard Practices 2) Control Charts 3) Calibration Methodologies Accuracy and Precision in the Laboratory Accuracy is examined when using Certified Reference Material (CRM). You report your Mean Value. Precision is examined using repeat measurements. You report the Standard Error s You report the Standard Error, s.
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Lectures: Classical Methods of Chemical Analysis 2 Control Chart: Tracking CRM mean with Time Mean Value Control Chart, X Upper/Lower Confidence Limit n s t x x 49.9 50.0 50.1 50.2 50.3 Sample Mean UCL 49.7 49.8 0 5 10 15 20 Sample Number LCL ABC D E F R Control Chart for CRM Control Chart: Tracking CRM range with Time Upper/Lower Confidence Limit n s t or 0 R 020 0.30 0.40 0.50 0.60 0.70 0.80 mple Range R 0.00 0.10 0.20 0 5 10 15 20 Sa Sample Number LCL
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Lectures: Classical Methods of Chemical Analysis 3 Construction a calibration curve Most methods have a fixed range where the
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This note was uploaded on 07/15/2011 for the course CHEM 287 taught by Professor Burns during the Fall '08 term at McGill.

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Chem 287_Chapter 5 - Lectures: Classical Methods of...

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