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本文讨论了茜素磺酸钠的pH变色域.通过用分光光度法测定离解常数、并结合目视观察的方法,确定试剂的目视pH变色域为4.7(黄)～6.3(红).
This article discusses the pH discoloration of sodium alizarin sulfonate.The visual pH shift of the reagent is determined to be 4.7 (yellow) to 6.3 (red) by spectrophotometric determination of the dissociation constant in combination with the visual observation.