カスタマーログイン 0 ショッピングカート
ホーム 書籍 電子書籍 ジャーナル 参考文献と会報 著者、編集者、レビュー者 A-Z商品インデックス
Physical Chemistry of Aqueous Systems: Meeting the Needs of Industry

ISBN 印刷: 978-1-56700-034-4

ISBN オンライン: 978-1-56700-445-8

HIGH TEMPERATURE pH MEASUREMENTS IN DILUTE AQUEOUS AMMONIA SOLUTIONS

要約

By employing an yttria-stabilized zirconia (YSZ) sensor, a hydrogen-platinum pH electrode, and an external pressure balanced reference electrode (EPBRE), experimental investigations of dilute aqueous ammonia solutions (0.4, 0.8, 1.2 ppm) at temperatures from 150°C to 300°C have been pursued. When employing EPBRE, the thermal liquid junction potential (TLJP) problem, which is a characteristic of this type of electrode, must be considered and an appropriate experimental and theoretical treatment of the problem has to be provided. Thermodynamics of non­isothermal cells (thermocells) is considered and applied, in order to derive pH values from the experimentally obtained potentials. Comparison with theoretically calculated pH values derived using the SUPCRT92 data base is presented. The estimated error of the measurements is found to be around ±0.1 pH units, which mainly appears due to a lack of our knowledge on the transport numbers ti and the Eastman entropies of transport S*i at temperatures higher then 100°C.
ホーム Begell Digital Portal Begellデジタルライブラリー ジャーナル 書籍 電子書籍 参考文献と会報 著者、編集者、レビュー者 A-Z商品インデックス 価格及び購読のポリシー Begell Houseの概要 連絡先 Language English 中文 Русский 日本語 Português Deutsch Français Español