フローインジェクション法による土壌中の亜硝酸態，硝酸態及びアンモニウム態窒素の定量

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タイトル別名
  • Determination of nitrite, nitrate and ammonium nitrogens in soil by FIA.
  • フロー インジェクションホウ ニ ヨル ドジョウチュウ ノ アショウサンタイ

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A FIA system was developed for the rapid and continuous determination of nitrite, nitrate and ammonium nitrogens in soil by spectrophotometry. Nitrite nitrogen was determined by using of N-(1-naphthyl)ethylenediamine. The reagent and sample solutions were injected in the order of reagent (40 μl), sample (40 μl) and reagent (40 μl) by a 16-port injection valve in carrier solution (deionized water). Ten meters long Teflon tubing (0.5 mm i.d.) was used as a reaction coil and maintained at 90°C. Nitrate ion was reduced to nitrite ion with a Cu-Cd column and determined by the same method as that for nitrite nitrogen. For determination of ammonium nitrogen, molecular ammonia was liberated by 1 M NaOH which was injected in both sides of sample solution. Molecular ammonia was separated by means of a tubular microporous poly(tetrafluoroethylene) membrane into a mixed reagent stream in the inner tube and determined by indophenol method. The method developed has been successfully applied to the analyses of soil extracts. The linear relationship between the signal and concentration were obtained for nitrite, nitrate and ammonium nitrogens in the range of 0.17, 120 and 1150 ppm, respectively. The relative standard deviation was 0.30.5%. The analysis time required for one sample was about 10 min.

収録刊行物

  • 分析化学

    分析化学 38 (9), 413-418, 1989

    公益社団法人 日本分析化学会

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