Measurement of Acidity of Inorganic Powders by Pyridine Adsorption

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  • ピリジン吸着法による無機粉体の酸性度の測定
  • ピリジン キュウチャクホウ ニヨル ムキ フンタイ ノ サンセイド ノ ソクテ

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Abstract

The acidities of inorganic powders used in cosmetics have not been successfully measured because of their low values or colors.<BR>The new method by pyridine adsorption was developed, in which the amount of adsorbed pyridine on any powder was simply and accurately determined by gas liquid chromatography.<BR>The amount of adsorbed pyridine was found to depend on the surface property rather than on the specific surface area or the pH of powder, and it closely corresponded to the acidity determined by the n-butylamine titration method.<BR>By this pyridine adsorption method, the acidities of inorganic powders were determined and graded.

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