インドフェノール抽出法による海水中のアンモニアの定量

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書誌事項

タイトル別名
  • Determination of ammonia in sea water by extraction of indophenol
  • インドフェノール チュウシュツホウ ニ ヨル カイスイチュウ ノ アンモニア ノ テイリョウ
公開日
1971
DOI
  • 10.2116/bunsekikagaku.20.993
公開者
公益社団法人 日本分析化学会

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説明

A sensitive method for the extraction of ammonia in sea water has been developed by using Chloramine T and thymol which are superior in stability and easiness of handling. The procedure established is as follows.<BR>Adjust the pH of 100 ml of a sample solution to 4.1 with 0.45M H3PO4 (Fig. 1). Add 3 ml of 2.5% Chloramine T solution (Fig. 2) and shake vigorously. After allowing to stand for 4080 sec. (Fig. 3), add 420 mg of thymol in 15 ml of acetone. Adjust the pH of the solution in 2 min. to 11.4 with 2M NaOH (Fig. 4) and mix well. Stand for 2 hr. at room temperature (1525°C), and then add 10 ml of 5M NaOH and 10 ml of n-hexylalcohol. Extract the produced indophenol by shaking for 20 sec. Centrifuge the extract after an addition of 5 g of K2CO3 and measure the absorbance at 675 mμ by using a 1-cm cell. In the case of a much higher concentration of ammonia, it is also possible to determine it by measuring the absorbance of the solution at 670 mμ without extraction. Nitrogen-containing compounds which are supposed to be in sea water do not interfere. The sensitivity of the method is the highest among those ever reported.

収録刊行物

  • 分析化学

    分析化学 20 (8), 993-997, 1971

    公益社団法人 日本分析化学会

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