Principle of Instrumental Analysis Chapter 1 Questions and Answers

Analytical Chemistry consists of two types of analysis: - Answer-Qualitative and quantitative There are 2 types of analytical methods: - Answer-Classical and intrumental Newer methods than classical methods for separating and determining chemical species such as chromatographic and electrophoretic techniques, light absorption or emission, mass-to-charge ratio, fluorescence, conductivity, and electrode potential. - Answer-What are instrumental methods To select an analytical method intelligently, it is essential to define clearly the nature of the ... - Answeranalytical problem What are the numerical criteria for selecting analytical methods? hint: PBSDDS - Answer-1. Precision 2. Bias 3. Sensitivity 4. Detection limit 5. Dynamic range 6. Selectivity What are the criteria to be considered for sensitivity? - Answer-A measure of its ability to discriminate between small differences in analyte concentration. Calibration sensitivity, analytical sensitivity What is a transducer in an analytical instrument? - Answer-A transducer is a device that converts chemical or physical information into an electrical signal or the reverse. The most common input transducers convert chemical or physical information into a current, voltage, or charge, and the most common output transducers convert electrical signals into some numerical form.What is the information processor in an instrument for measuring the color of a solution visually? - Answer-the human brain What is the detector in a spectrograph in which spectral lines are recorded photographically? - Answer-A photographic film or plate What is a data domain? - Answer-One of the modes in which data may be recorded. What is a figure of merit? - Answer-a number that provides quantitative information about some performance criterion for an instrument or method.