碩士 / 正修科技大學 / 化工與材料工程研究所 / 97 / The chemical oxygen demand is reflects the water body one of organic matter pollution degree important targets, however in water sample if has the chloride ion, can have the serious disturbance in the chemical oxygen demand determination to cause to measure the value is high, then misinterprets its analysis result, this research in view of Executive Yuan environmental protection bureau environment examination center water quality examination announcement method (NIEA W516.54A), the high concentrated halogen ion of chemical oxygen demand examination method including of water-Potassium Dichromate back-flow method, proposes in the step improvement and the suggestion, by the time can in the fine accurate survey sea water the chemical oxygen demand. This research reference above method, take chloride ion density 2000 mg/L as the low halogen and watershed of the high halogen water sample, in view of shed chlorine time length, Potassium Dichromate Back-flow liquid concentration and Increase Chromium-potassium sulfate or not, discusses the sea water chemical oxygen demand by its result the most suitable method. By experimental result knowing, the high halogen sample its shed chlorine time take 4 hours above as good, uses 0.001667 M Potassium Dichromate back-flow with to do for the oxidant, on the one hand may reduce the dichromate ion and the chloride ion Oxidation-Reduction action, on the other hand may reduce in the titrate step the error, the increase Chromium-potassium sulfate may suppress the dichromate ion in the digestion back-flow of the self-decomposition reaction. This research discussion most suitable method, its applicable scope is COD below density 20 mg/L, also the chlorine salinity reaches as high as when 20000 mg/L was still suitable, therefore its should also be suitable for examination the sea water chemical oxygen demand. But by entire research process, is the suggestion when in the water the chloride ion density is higher than 1000 mg/L, If passes through the shed chlorine process to be supposed first to be possible to improve the empirical datum quality.
| Identifer | oai:union.ndltd.org:TW/097CSU00063007 |
| Date | January 2008 |
| Creators | Fang Yu, 鄭芳宇 |
| Contributors | 黃平志 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 89 |
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