Encyclopaedia Of Analytical Chemistry : Applications , Processes & Instrumentation ( 6 Volumes Set )
The analytical process often begins with a question that is not phrased in terms of a chemical analysis. The question could be “Does lead in petrol enter our food supply?” or “Is this water safe to drink?” or “Does emission testing of automobiles reduce air pollution?” A scientist translates such questions into the need for particular measurements. An analytical chemist then must choose or invent a procedure to carry out those measurements. When the analysis is complete, the analyst must translate the results into terms that can be understood by others preferably by the general public. A most important feature of any results is its limitations. What is the statistical uncertainty in reported results? If you took samples in a different manner, would you obtain the same results? Is a tiny amount (a trace) of analyte found in a sample really there or is it contamination? Once all interested parties understand the results and their limitations, then they can draw conclusions and reach decisions. A sample that requires analysis is often a mixture of many components in a complex matrix. For samples containing unknown compounds, the components must be separated from each other so that each individual component can be identified by other analytical methods. The separation properties of the components in a mixture are constant under constant conditions, and therefore once determined they can be used to identify and quantify each of the components. Such procedures are typical in chromatographic and electrophoretic analytical separations. The volumes provide a clear understanding of the principles, applications and limitations of the various techniques involved in analytical chemistry.
AUTOR: Bricker, Benedict
EDITORA: Auris Reference
DISPONIBILIDADE DO PRODUTO: Sob Encomenda - Até 40 dias ( Importação )