lec03.sample_prep - SAMPLE PREPARATION SAMPLE PREPARATION...

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SAMPLE PREPARATION
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SAMPLE PREPARATION PURPOSES: MAKE THE SAMPLE COMPATIBLE WITH THE ANALYTICAL INSTRUMENT. REMOVE INTERFERENCES INCREASE SENSITIVITY
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THE METHOD OF SAMPLE PREPARATION MUST TAKE INTO ACCOUNT BOTH THE NATURE OF THE SAMPLE AND THE NATURE OF THE ANALYTICAL EQUIPMENT. FIND A METHOD THAT USES THE ANALYTICAL EQUIPMENT THAT YOU HAVE AVAILABLE.
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SAMPLE STORAGE IMPORTANT CONSIDERATIONS FOR STORAGE How long? What type of container? Losses, contamination, etc. What about chemical stability? Photodecomposition, oxidation, etc. What about enzymatic stability? What about microbiological stability? Are stabilizers or sterilization needed?
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SAMPLE PROCESSING Number of Sample Preparation Techniques Required per Sample (Survey in LC/GC Magazine) Number of Techniques Percent of Respondants 1 19.3 2 28.6 3 20.7 4 15.0 5 8.6 6 2.1 7 0.7 More than 7 5.0
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Diagram For Sample Preparation for the Analysis of Pregnenolone in Rat Brain using Derivatization with 1- Anthroylnitrile.
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Evaporation, Reconstitution, Dilution,
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lec03.sample_prep - SAMPLE PREPARATION SAMPLE PREPARATION...

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