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Sub-sampling (chemistry) In analytical chemistry, sub-sampling is a procedure by which a small, representative sample is taken from a larger sample. Good sub-sampling technique becomes important when the large sample is not homogeneous .
Samples of different Rosé Wines in glass tubes showing range of colours available. In general, a sample is a limited quantity of something which is intended to be similar to and represent a larger amount of that thing (s). [1] The things could be countable objects such as individual items available as units for sale, or an uncountable material.
In analytical chemistry, sample preparation (working-up) refers to the ways in which a sample is treated prior to its analyses. Preparation is a very important step in most analytical techniques, because the techniques are often not responsive to the analyte in its in-situ form, or the results are distorted by interfering species. Sample ...
In chemical analysis, matrix refers to the components of a sample other than the analyte [1] of interest. The matrix can have a considerable effect on the way the analysis is conducted and the quality of the results are obtained; such effects are called matrix effects. [2] For example, the ionic strength of the solution can have an effect on ...
Analytical chemistry consists of classical, wet chemical methods and modern, instrumental methods. [2] Classical qualitative methods use separations such as precipitation, extraction, and distillation. Identification may be based on differences in color, odor, melting point, boiling point, solubility, radioactivity or reactivity.
Representative layer theory. The concept of the representative layer came about though the work of Donald Dahm, with the assistance of Kevin Dahm and Karl Norris, to describe spectroscopic properties of particulate samples, especially as applied to near-infrared spectroscopy. [1] [2] A representative layer has the same void fraction as the ...
MicroCal. VP-ITC in a glove box. In chemical thermodynamics, isothermal titration calorimetry ( ITC) is a physical technique used to determine the thermodynamic parameters of interactions in solution. [1] [2] It is most often used to study the binding of small molecules (such as medicinal compounds) to larger macromolecules ( proteins, DNA etc ...
Sampling (medicine), gathering of matter from the body to aid in the process of a medical diagnosis and/or evaluation of an indication for treatment, further medical tests or other procedures. Sampling (for testing or analysis), taking a representative portion of a material or product to test (e.g. by physical measurements, chemical analysis ...