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題 名 | 疊氮修正希巴辣光度測氧法及其在環境監測上的應用=Azide-Modified Shibala Colorimetric Method for the Determination of Dissolved Oxygen and an Assessment of its Applicability to Environmental Studies |
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作 者 | 白書禎; 郭廷瑜; 鍾仕偉; 蘇宗德; | 書刊名 | 化學 |
卷 期 | 56:3 1998.09[民87.09] |
頁 次 | 頁173-185 |
分類號 | 445.213 |
關鍵詞 | 疊氮修正; 希巴辣光度法; 溶氧; 碘化學; Azide modification; Shibala colorimetry; Oxygen; Iodometry; |
語 文 | 中文(Chinese) |
中文摘要 | 本文介紹一種新發展的光學測溶氧方法,其化學反應原理雖然與傳統的溫可樂碘 滴定法 (Winkler titration) 類似,但以分光光度計取代了滴定步驟而直接在 456nm 波長 測定。由於本法取樣過程中加了疊氮以遮蔽亞硝酸根離子干擾,測定後再用去碘修正濁度干 擾, 不僅可用於一般自然水體, 也適用於監測排放水及渾濁的樣本。 測值的精密度可達 0.1% ,準確度可達 0.5%,均優於美國 APHA 標準方法中的碘滴定法 (421B) 及我國環保署 公布之標準方法 (NIEA 421.54C)。此外,本法及設備也可延伸應用於許多原來用碘滴定原 理 (iodometry) 測定的環境監測項目上。 |
英文摘要 | An improved Shibala colorimetric method with azide-modification for the determination of oxygen in natural and waste water is proposed. The chemical reaction during the pickling is similar to that of the traditional Winkler titration, but the detection of liberated iodine was made by direct spectrophotometry at 456nm. Inter ference of nitrite of no more than 200 uM was masked completely by sodium azide. Sample containing sus pended solids was corrected for turbidity after adding excess thiosulphate to de-color liberated iodine. Both precision and accuracy were higher than that could be obtained with the titration by an order of magnitude. The proposed method can also be extended to replace titration procedure in many other measurements involv ing iodometry. |
本系統中英文摘要資訊取自各篇刊載內容。