@article{oai:kanazawa-u.repo.nii.ac.jp:00031258,
 author = {松本, 健 and 北川, 真由美},
 issue = {8},
 journal = {分析化学 = Japan analyst},
 month = {Aug},
 note = {難溶性の酸化セリウム(IV)の分解方法として, 硫酸水素アンモニウム融解法を検討し, 迅速簡便な方法を確立した. すなわち, 硬質ガラス製試験管にセリウム化合物試料と硫酸水素アンモニウム約3gを入れて混合した後, バーナーの小さなフレームで350〜450℃に加熱する. 約数分から10分間の加熱で分解は十分であり, 分解と同時に黄色のセリウム(IV)はセリウム(III)に還元され, 融解物は無色になる. 固化した白色の融解物を水で溶解し, 溶液中のセリウム(III)を吸光光度法あるいは滴定法で定量する. 本法を難溶性セリウム化合物であるチタン酸セリウム(IV)及びジルコニウム酸セリウム(IV)等の分解に応用し, 試料中のセリウム, チタン及びジルコニウムを再現性良く正確に定量した. 定量値は計算値と良く一致した. 本法は試料の分解過程を目視で確認でき, 容器の損傷がなく, 高濃度のアルカリ金属を含まない試料溶液を容易に調製できるなどの特色がある. A simple and rapid method for the decomposition of refractory cerium compounds has been proposed. Cerium samples (CeO_2, CeTiO_4, CeZrO_4 and ore) were decomposed by fusion with ammonium hydrogen sulfate, which was found to be a suitably powerful flux for dissolving various refractory cerium compounds. An accurately weighed sample (ca. 30〜100 mg) was placed in a dry Pyrex glass test-tube (16 mm o.d., 180 mm length). Ammonium hydrogen sulfate(ca. 3 g) was added to the tube and mixed with the sample by agitating the tube. The bottom of the test tube was gently heated along with a swirling motion over a small gas flame of a Bunsen burner with a fish-tail at a temperature of ca. 350〜450℃. Heating was continued until the yellow melt changed into a colorless, clear and translucent form. The cooled melt was dissolved in water. Cerium(IV) oxide was dissolved by heating for about 6 min; for cerium(IV) titanate and cerium(IV) zirconate it was about 10 min. Finally, the concentration of the cerium in the resulting solution was determined by absorption spectrophotometry or a redox titrimetric method. This method was successfully applied to various cerium compounds and ore. The cerium, titanium and zirconium in the samples were determined., 金沢大学イノベーション創成センター},
 pages = {491--495},
 title = {硫酸水素アンモニウム融解による難溶性酸化セリウム(IV)の迅速分解と分析への応用},
 volume = {47},
 year = {1998}
}