碩士 / 國立臺灣大學 / 海洋研究所 / 89 / This study focuses on the pH and buffering capacity problems involved in the determination of ammonia in seawater by the indophenol blue colo-rimetric method. The pH-shift puzzle was unraveled by acid-base titration. The major buffering capacity for the indophenol blue method is induced by the combination of the phenate system (pK = 10) and a previous — un-known Mg-citrate system. By adding extra alkali reagent to compensate for the pH difference in saline media, the molar absorptivity was found to be 21000 /M/cm at 640 nm. For sample with a variety of salinities, an empirical equation is suggested to correct the results.
| Identifer | oai:union.ndltd.org:TW/089NTU00279037 |
| Date | January 2001 |
| Creators | Tai-I Yang, 楊岱宜 |
| Contributors | S. C. Pai, 白書禎 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 63 |
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