Also found in: Dictionary, Encyclopedia, Wikipedia.
Related to quinhydrone: quinhydrone electrode


A mixture of equimolecular quantities of quinone and hydroquinone; used in pH determinations (that is, via a q. electrode).
References in periodicals archive ?
Each kit contains one pint of pH 7 buffer, one pint of pH 4 buffer, 20 grams of quinhydrone, 3 measuring cups and 75 wood applicators; enough material for 30 two-point calibrations.
The degree of acidity (or alkalinity) of a soil as determined by means of a glass, quinhydrone, or other suit able electrode or indicator at a specified moisture content or soil-water ratio, and expressed in terms of the pH scale.