Study on the Interference in the Determination of Ammonia in Seawater
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...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2001
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| Online Access: | http://ndltd.ncl.edu.tw/handle/10761910716004628024 |
| Summary: | 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.
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