アンモニア気体感応電極による底質及び土壌中アンモニアの簡易定量

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タイトル別名
  • Simple method of determination of ammonia in environmental sediments and soils with ammonia gas-sensing electrode.
  • アンモニア キタイ カンノウ デンキョク ニ ヨル テイシツ オヨビ ドジョウ

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抄録

The coexistent substances cause a detectable shift or drift in gas-sensing electrode potential at low levels of ammonia. Electrode response is a function of ammonia concentration, and considerable response times are required for the steady-state potential below 10-4 mol dm-3 ammonia. The applicability of potentiometric Glan's plots for determining ammonia at these low levels was studied on the basis of response time characteristics, and the theoretical equation of response time was proposed. The definition of response time adopted in this work is the time taken for the electrode response to attain a value 1 mV lower from the steady-state potential. As a result, Glan's plots is available for simple determination of low level of ammonia. Preliminary studies on relative errors were made in (0.34.0)×10-5 mol dm-3 ammonia solutions containing potassium sulfate, copper(II) ion and/or EDTA, indicating that Glan's plots is superior to the other methods of known addition and calibration. The environmental samples of sediments, sand, and soil were digested by Kjeldhal method using potassium sulfate and copper sulfate as decomposition reagents, each 5 ml of 100 ml solution obtained was made up to 100 ml and 19 ml aliquot was transferred to 30 ml beaker for ammonia analysis. The present method was applied directly to determine ammonia in these samples prepared without steam distillation procedure, and the results showed a reasonable agreement with those obtained by conventional Indophenol Blue method.

収録刊行物

  • 分析化学

    分析化学 34 (11), 701-706, 1985

    公益社団法人 日本分析化学会

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