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Analytical chemistry
Industry: Chemistry
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Analytical chemistry
Acetyl number
Chemistry; Analytical chemistry
A measure of free hydroxyl groups in fats or oils determined by the amount of potassium hydroxide used to neutralise the acetic acid formed by saponification of acetylated fat or oil.
Peroxide number
Chemistry; Analytical chemistry
Measure of millimoles of peroxide (or milliequivalents of oxygen) taken up by 1000 grammes of fat or oil; used to measure rancidity. Also known as peroxide value.
Differential thermometric titration
Chemistry; Analytical chemistry
Thermometric titration in which titrant is added simultaneously to the reaction mixture and to a blank in identically equipped cells.
Acid-base indicator
Chemistry; Analytical chemistry
A substance that reveals, through characteristic colour changes, the degree of acidity or basicity of solutions.
Phase ratio
Chemistry; Analytical chemistry
In chromatography, the ratio of the volume of the mobile phase to that of the stationary phase in a chromatographic column.
Diffusion current
Chemistry; Analytical chemistry
In polarography with a dropping-mercury electrode, the flow that is controled by the rate of diffusion of the active solution species across the concentration gradient produced by the removal of ions ...
Acid-base titration
Chemistry; Analytical chemistry
A titration in which an acid of known concentration is added to a solution of base of unknown concentration, or the converse.
