By Gary D. Christian
The seventh version of Gary Christian's Analytical Chemistry makes a speciality of extra in-depth insurance and knowledge approximately Quantitative research (aka Analytical Chemistry) and similar fields. The content material builds upon prior versions with extra more advantageous content material that offers with rules and methods of quantitative research with extra examples of analytical options drawn from parts equivalent to scientific chemistry, existence sciences, air and water pollutants, and commercial analyses.
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Extra info for Analytical Chemistry
Tex 10 Care must be taken not to alter or contaminate the sample. M. Page 10 CHAPTER 1 ANALYTICAL OBJECTIVES, OR: WHAT ANALYTICAL CHEMISTS DO plasma remaining can be analyzed. Plasma and serum are essentially identical in chemical composition, the chief difference being that ﬁbrinogen has been removed from the latter. Details of sampling other materials are available in reference books on speciﬁc areas of analysis. See the references at the end of the chapter for some citations. Certain precautions should be taken in handling and storing samples to prevent or minimize contamination, loss, decomposition, or matrix change.
Ashing is the burning of organic matter. Digestion is the wet oxidation of organic matter. The pH of the sample solution will usually have to be adjusted. Always run a blank! M. Page 12 CHAPTER 1 ANALYTICAL OBJECTIVES, OR: WHAT ANALYTICAL CHEMISTS DO PERFORMING THE MEASUREMENT——YOU DECIDE THE METHOD Instruments are more selective and sensitive than volumetric and gravimetric methods. But they may be less precise. The method employed for the actual quantitative measurement of the analyte will depend on a number of factors, not the least important being the amount of analyte present and the accuracy and precision required.
The reagent-grade chemicals, besides meeting minimum requirements of purity, may be supplied with a report of analysis of the impurities (printed on the label). 95% pure. They are analyzed and the results are printed on the label. They are more expensive than reagent-grade chemicals and are used only for the preparation of standard solutions or for the standardization of a solution by reaction (titration) with it. Not all chemicals are available in primary standard grade. There are special grades of solvents for special purposes, for example, spectroscopy or liquid chromatography/mass spectrometry grades.
Analytical Chemistry by Gary D. Christian