RelativeResourceManager(2) - Introduction to Instrumental...

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Introduction to Instrumental Analysis and Evaluation of Data Chem 420 August 27, 2008
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Business items from Monday z Notes will be uploaded on-line (compass.uiuc.edu) after class z TA (Callie) is the first line of contact for questions about absences, etc. z Problem sets will be due at the beginning of class on the respective due dates. z Grade breakdown (exams vs. problem sets)
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Grade breakdown z 60:40 exams:problem sets z Each problem set is worth 80 points z 400 total z Exams 1&2 each are worth 175 points z 350 total z Final exam is worth 250 points z Total course: 1000 point
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Types of analytical methods z Classical methods z Information extracted from human observables z Color, melting/boiling point, solubilities, odors, refractive index, (taste) z Gravimetric or Volumetric z Instrumental methods—early 1900s z Measure less readily observable physical characteristics z Conductivity, light absorption or emission, m/z ratio z Improved methods of separation z Chromatography and electrophoresis
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Instrumental methods and what they measure Electromagnetic methods Electrical methods P h o t n s a re m d u la e b y p le
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Instruments are translators z Convert physical or chemical properties that we can’t directly observe into information that we can interpret. 0 0 log log P T P AT b c P P c b ε = =− = =
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Sometimes multiple translations are needed z Thermometer z Bimetallic coil converts temperature to physical displacement z Scale converts angle of the pointer to a number that can be observed z Thermostat z Displacement used to activate switch adapted from C.G. Enke, The Art and Science of Chemical Analysis , 2001 . http://static.howstuffworks.com/gif/home-thermostat-thermometer.jpg
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Components in translation
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Data domains (languages) z Information is encoded and transferred in between domains z Non-electrical domains z Beginning and end of a measurement z Electrical domains z Intermediate data collection and processing Initial conversion device Intermediate conversion device Readout conversion device Q u a n t i y o b e m s r d I q 2 N 1 PMT Resistor Digital voltmeter E mi V l g ( = R ) C
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Data domains, continued
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This note was uploaded on 04/08/2010 for the course CHEM 420 taught by Professor Bailey during the Spring '08 term at University of Illinois at Urbana–Champaign.

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RelativeResourceManager(2) - Introduction to Instrumental...

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