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Analytical chemistry
Industry: Chemistry
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Analytical chemistry
two-dimensional chromatography
Chemistry; Analytical chemistry
A paper chromatography technique in which the sample is resolved by standard procedures (ascending, descending, or horizontal solvent movement) and then turned at right angles in a second solvent and ...
oxidation-reduction indicator
Chemistry; Analytical chemistry
A compound whose color in the oxidized state differs from that in the reduced state.
countercurrent cascade
Chemistry; Analytical chemistry
An extraction process involving the introduction of a sample, all at once, into a continuously flowing countercurrent system where both phases are moving in opposite directions and are continuously ...
ultimate analysis
Chemistry; Analytical chemistry
The determination of the percentage of elements contained in a chemical substance.
oxygen-flask method
Chemistry; Analytical chemistry
Technique to determine the presence of combustible elements; the sample is burned with oxygen in a closed flask, and combustion products are absorbed in water of dilute alkali with subsequent ...
crosscurrent extraction
Chemistry; Analytical chemistry
Procedure of batchwise liquid-liquid extraction in a separatory funnel; solvent is added to the sample in the funnel, which is then shaken, and the extract phase is allowed to coalesce, then is drawn ...
ultrasensitive mass spectrometry
Chemistry; Analytical chemistry
A form of mass spectrometry in which the ions to be detected are accelerated to megaelectronvolt energies in a particle accelerator and passed through a thin gas cell or foil, stripping away outer ...
