フローインジェクション分析法による海水および濃厚食塩水溶液中の極微量アンモニア態窒素の簡易・迅速定量  [in Japanese] Flow-Injection Analysis System for Simple and Rapid Determination of Ammonia-Nitrogen at Sub-ppm Levels in Seawater and Concentrated Sodium Chloride Solution  [in Japanese]

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Author(s)

Abstract

A flow-injection analysis (FIA) system is presented for simple and rapid determination of ammonia at sub-ppm levels in seawater and concentrated sodium chloride solution. The system consists of a direct on-line coupling of the gas diffusion separation using porous polytetrafluoroethylene (PTFE) membrane tubing and subsequent spectrophotometric detection of ammonia by the formation of indophenol blue dye with sodium hypochlorite and 1-naphthol in a continuous flow system. Sodium citrate added to the alkaline medium which is essential to convert ammonium ion to ammonia proved to be very effective in preventing magnesium and calcium in the seawater sample from precipitating in this FIA system, thus enabling the direct injection of seawater sample. No laborious complicated manual operation for separation and detection is required. The limit of detection was 0.008 ppb and satisfactory precision of 1% relative standard deviation was also obtained. The analytical readout is available within 6 min after sample injection.

Journal

  • Bulletin of the Society of Sea Water Science, Japan

    Bulletin of the Society of Sea Water Science, Japan 49(5), 318-320, 1995-09-30

    The Society of Sea Water Science, Japan

References:  8

Codes

  • NII Article ID (NAID)
    10008279802
  • NII NACSIS-CAT ID (NCID)
    AN0018645X
  • Text Lang
    JPN
  • Article Type
    NOT
  • ISSN
    03694550
  • NDL Article ID
    3640446
  • NDL Source Classification
    PA43;PA49
  • NDL Source Classification
    ZM44(科学技術--地球科学--海洋・陸水・火山) // ZP8(科学技術--化学・化学工業--無機化学・無機化学工業)
  • NDL Call No.
    Z15-47
  • Data Source
    CJP  NDL  J-STAGE 
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