tailieunhanh - Intro to Analytical Chemistry

Analytical chemists work to improve the reliability of existing techniques to meet the demands of for better chemical measurements which arise constantly in our society They adapt proven methodologies to new kinds of materials or to answer new questions about their composition. They carry out research to discover completely new principles of measurements and are at the forefront of the utilization of major discoveries such as lasers and microchip devices for practical purposes. | 4 30 2012 a W VILLANOVA UNIVERSITY Introduction to Analytical Chemistry Lecture Date January 14th 2008 What is Analytical Chemistry Analytical chemistry seeks ever improved means of measuring the chemical composition of natural and artificial materials The techniques of this science are used to identify the substances which may be present in a material and determine the exact amounts of the identified substances Qualitative provides information about the identity of an atomic molecular or biomolecular species Quantitative provides numerical information as to the relative amounts of species Definitions from 1 4 30 2012 The Role of Analytical Chemistry -Friedrich Wilhelm Ostwald Analytical Chemistry or the art of recognizing different substances and determining their constituents takes a prominent position among the applications of science since the questions which it enables us to answer arise wherever chemical processes are employed for scientific or chemical purposes. http www. dyson academics chemistryplv The Role of Analytical Chemistry Analytical chemists work to improve the reliability of existing techniques to meet the demands of for better chemical measurements which arise constantly in our society They adapt proven methodologies to new kinds of materials or to answer new questions about their composition. They carry out research to discover completely new principles of measurements and are at the forefront of the utilization of major discoveries such as lasers and microchip devices for practical purposes. Medicine Industry Environmental Food and Agriculture Forensics Archaeology Space science 2 4 30 2012 History of Analytical Methods Classical methods early years separation of analytes via precipitation extraction or distillation Qualitative recognized by color boiling point solubility taste Quantitative gravimetric or titrimetric measurements Instrumental Methods newer faster more efficient Physical properties of analytes conductivity