A practical resource, this book covers sampling and storage, description of analytical methodology, and guidelines and procedures for quality assurance. It presents analytical methods with step-by-step procedures to help practitioners implement these methods in the laboratory, making them instantly applicable without consulting further literature. The book also covers how to develop or improve quality control and quality assurance programs in the laboratory. It includes the availability and measurement of standard reference materials, blank estimation and correction, control of recoveries, and statistical evaluation of quality assurance data.