Determination of Zinc Oxide in Electrophotographic Paper by Chelatometric Titration of Acid Extract

TSUKAHARA Hirokazu, BANBA Takashi, YAMAFUJI Tadashi

doi:10.11370/isjep.9.2_64

A method for the determination of Zine Oxide in electrophotographic papers by chelatometric titration was established. Zinc ion was extracted wth diluted hydrochloric acid or acetic acid from the photosensitive layer which was composed of zinc oxide microcrystallines, sensitizing dyes and hydrophobic polymeric substances, within rather short time quantitatively. The acid extracts were titrated with M/100 aqueous solution of EDTA-2Na under the presence of an indicator such as Eriochrome Black T (plus triethanolamine; at pH=10) or Xylenol Orange (at pH=5).<br>Influences of polyvalent metallic ions which were contained in components of electro-photographic paper, particularly in those of the base-paper, such as clay, talc, calcium carbonate, calcium chloride or aluminum, on the determination of zinc oxide were investigated to know that clay (Al₂Si₂O₅ (OH) ₄) in the base-paper caused no error and when metallic aluminum or water-soluble aluminum salts were present, EBT-indicator (plus triethanolamine) had to be used, and that when alkaline earth metals were not to be neglected, XO-indicator had to be used.<br>The method was applied to commercially available electrophotographic papers in order to determine the weight of coated zinc oxide microcrystallines.

Determination of Zinc Oxide in Electrophotographic Paper by Chelatometric Titration of Acid Extract

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