フローインジェクション分析法による微量の亜硝酸及び硝酸イオンの定量

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タイトル別名
  • Determination of trace amounts of nitrite and nitrate by flow injection spectrophotometry
  • フロー インジェクション ブンセキホウ ニヨル ビリョウ ノ アショウサン オ

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抄録

A system has been developed for the determination of nitrite and nitrate ions by flow injection analysis. The flow lines were made from polytetrafluoroethylene (PTFE) tubing. For the nitrite determination a 650 μl of sample is injected into a stream of 0.04 % (w/v) p-aminoacetophenone (p-AAP) solution in 47 mM hydrochloric acid, and flows down a mixing coil (1 mmφ×1 m) in a thermostated bath at 45°C. The mixture meets a stream of 0.11 % (w/v) m-phenylene-diamine dihydrochloride (m-PD) solution in 1.2 mM hydrochloric acid. After the mixing coil (1 mmφ× 1 m, 45°C), the absorbance at 456 nm is measured by a spectrophotometer with a 10-mm flow-through cell (8 μl) against water as reference. For the nitrate determination a 650 μl of sample is injected into 1.2 mM EDTA carrier solution (pH 9.8) and passed through a copperized cadmium column {3 mmφ×70 mm, particle size: (0.52) mm} to convert quantitatively nitrate to nitrite. Then, the carrier solution is merged into the stream of a mixed reagent solution of 0.02 % (w/v)p-AAP and 0.055 % (w/v) m-PD in 24 mM hydrochloric acid. After the mixing coil (1 mmφ× 1 m, 45°C), the absorbance is measured at 456 nm. Sampling rate was 30 samples per hour. The relative standard deviations (n= 10) were 0.97 % and 0.89 % for 10 μg/l and 30 μg/l of nitrite-nitrogen, respectively, and 0.95 % and 0.66 % for 0.1 mg/l and 0.3 mg/l of nitrate-nitrogen, respectively. A detection limit was 0.4 μg/l and 2 μg/l for nitrite- and nitrate-nitrogen, respectively.

収録刊行物

  • 分析化学

    分析化学 31 (12), 732-733, 1982

    公益社団法人 日本分析化学会

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