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- https://chem.libretexts.org/Courses/Los_Angeles_Trade_Technical_College/Analytical_Chemistry/2%3A_Analytical_Chemistry_2.0_(Harvey)/04%3A_The_Vocabulary_of_Analytical_Chemistry/4.1%3A_Analysis%2C_Determination%2C_and_MeasurementThe first important distinction we will make is among the terms analysis, determination, and measurement. An analysis provides chemical or physical information about a sample. The component of interes...The first important distinction we will make is among the terms analysis, determination, and measurement. An analysis provides chemical or physical information about a sample. The component of interest in the sample is called the analyte, and the remainder of the sample is the matrix. In an analysis we determine the identity, concentration, or properties of an analyte. To make this determination we measure one or more of the analyte’s chemical or physical properties.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Instrumental_Analysis_(LibreTexts)/31%3A_Thermal_MethodsA thermal method of analysis is a technique in which measure a physical property of a material as we subject it to a change in temperature. In this chapter we consider three examples of thermal method...A thermal method of analysis is a technique in which measure a physical property of a material as we subject it to a change in temperature. In this chapter we consider three examples of thermal methods: thermogravimetry, differential thermal analysis, and differential scanning calorimetry.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Instrumental_Analysis_(LibreTexts)/33%3A_Automated_Methods_of_Analysis
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Instrumental_Analysis_(LibreTexts)/32%3A_Radiochemical_MethodsRadiochemical methods of analysis take advantage of the instability of some elemental isotopes, which decay through the release of alpha particles, beta particles, gamma rays, and/or X-rays, provide f...Radiochemical methods of analysis take advantage of the instability of some elemental isotopes, which decay through the release of alpha particles, beta particles, gamma rays, and/or X-rays, provide for a selective analysis for one analyte in a complex mixture of other species without the need for a prior separation. In this chapter we review the basics of radioactive decay and its direct application to samples, and two other methods of importance: neutron activation and isotope dilution.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Instrumental_Analysis_(LibreTexts)/28%3A_High-Performance_Liquid_ChromatographyIn high-performance liquid chromatography (HPLC) we inject the sample, which is in solution form, into a liquid mobile phase. The mobile phase carries the sample through a packed or capillary column t...In high-performance liquid chromatography (HPLC) we inject the sample, which is in solution form, into a liquid mobile phase. The mobile phase carries the sample through a packed or capillary column that separates the sample’s components based on their ability to partition between the mobile phase and the stationary phase. By adjusting conditions it usually is possible to design a separation so that analytes elute by themselves, even when the mixture is complex.
- https://chem.libretexts.org/Bookshelves/General_Chemistry/General_Chemistry_Supplement_(Eames)/Chemistry_Calculations/Dimensional_AnalysisDimensional analysis means thinking about units piece by piece. Dimensional analysis can by to correctly go between different types of units, to catch mistakes in one's calculations, and to make many ...Dimensional analysis means thinking about units piece by piece. Dimensional analysis can by to correctly go between different types of units, to catch mistakes in one's calculations, and to make many useful calculations in real life. Essentially, dimensional analysis means multiplying by one. You collect a set of "conversion factors" or ratios that equal one, and then multiply a quantity that you are interested in by those "ones."
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Analytical_Chemistry_2.1_(Harvey)/07%3A_Obtaining_and_Preparing_Samples_for_Analysis/7.03%3A_Implementing_the_Sampling_PlanThe page discusses the steps involved in implementing a sampling plan, emphasizing the importance of preventing contamination and preserving samples to maintain their representativeness of the target ...The page discusses the steps involved in implementing a sampling plan, emphasizing the importance of preventing contamination and preserving samples to maintain their representativeness of the target population. It describes various sample types, including solutions, gases, and solids, and the methods used for their collection, preservation, and preparation.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Instrumental_Analysis_(LibreTexts)/23%3A_PotentiometryIn potentiometry we measure the potential of an electrochemical cell under static conditions. Because no current—or only a negligible current—flows through the electrochemical cell, its composition re...In potentiometry we measure the potential of an electrochemical cell under static conditions. Because no current—or only a negligible current—flows through the electrochemical cell, its composition remains unchanged. For this reason, potentiometry is a useful quantitative method of analysis.
- https://chem.libretexts.org/Courses/Los_Angeles_Trade_Technical_College/Analytical_Chemistry/2%3A_Analytical_Chemistry_2.0_(Harvey)/14%3A_Kinetic_Methods/14.1%3A_Kinetic_Methods_Versus_Equilibrium_MethodsIn an equilibrium method the analytical signal is determined by an equilibrium reaction involving the analyte or by a steady-state process that maintains the analyte’s concentration. In a kinetic meth...In an equilibrium method the analytical signal is determined by an equilibrium reaction involving the analyte or by a steady-state process that maintains the analyte’s concentration. In a kinetic method the analytical signal is determined by the rate of a reaction involving the analyte, or by a nonsteady-state process. As a result, the analyte’s concentration changes during the time in which we are monitoring the signal.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Analytical_Chemistry_2.1_(Harvey)/03%3A__The_Vocabulary_of_Analytical_Chemistry/3.06%3A_ProtocolsA protocol is a set of stringent written guidelines crucial for agency approval of analytical results. It includes procedures for internal and external QA/QC to ensure accuracy. The EPA's protocol for...A protocol is a set of stringent written guidelines crucial for agency approval of analytical results. It includes procedures for internal and external QA/QC to ensure accuracy. The EPA's protocol for trace metal analysis using atomic absorption spectroscopy involves calibration with a method blank and three standards. Calibration is verified through ICV and ICB samples, needing results within ??10% accuracy.
- https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Physical_Chemistry_(LibreTexts)/32%3A_Math_Chapters/32.10%3A_Fourier_Analysis/32.10.01%3A_Fourier_Analysis_in_MatlabThis page discusses Fourier analysis, which breaks down functions into simpler components and reconstructs them through Fourier synthesis. The Fourier transform is a critical process that represents f...This page discusses Fourier analysis, which breaks down functions into simpler components and reconstructs them through Fourier synthesis. The Fourier transform is a critical process that represents functions using complex exponentials. It is widely applied in fields like signal processing, where tools such as Matlab's FFT compute discrete Fourier transforms. This analysis helps identify frequency components in noisy signals, offering insights into the underlying structure of complex data.
