2 - Analysis of the sample Samples rarely "bench ready" for...

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1 Analysis of the sample • Samples rarely "bench ready" for analysis – Pre-treatments of various kinds – May include removal of INTERFERENCES • Substances that "add on" to the result, or decrease the apparent analyte level, or otherwise interfere with the chemistry – Usually REPLICATE samples are measured • Carried out in the same or different laboratory – Methods generally require CALIBRATION with STANDARDS • Materials of accurately known composition measured by the same method 1 Analysis of the sample Effect on Sample 2 Destructive Non-Destructive e.g. Dissolve a steel sample, analyze for Cr Microscopic examination, e.g., UV/VIS spectrum Performing Analysis Interference 3 Additive Reductive Interfere e.g., Mg 2+ in Ca 2+ analysis e.g., Fe 2+ in F - analysis e.g. Colored species and indicators
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2 Performing Analysis Blank analysis – Perform analysis on sample matrix without analyte Calibration – Perform analysis on a series of known concentrations of a standard
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This note was uploaded on 04/12/2010 for the course ENGINEERIN 1ac3 taught by Professor Xxx during the Spring '10 term at McMaster University.

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2 - Analysis of the sample Samples rarely "bench ready" for...

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