Spectrophotometric determination of nitrate ion and total nitrogen in water using Cu-Zn column.

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  • NAMIKI Hiroshi
    Department of Applied Chemistry, Faculty of Engineering, Kogakuin University
  • UEDA Kohtarou
    Department of Applied Chemistry, Faculty of Engineering, Kogakuin University
  • NAGASHIMA Kunio
    Department of Applied Chemistry, Faculty of Engineering, Kogakuin University
  • KAMAYA Minori
    Department of Applied Chemistry, Faculty of Engineering, Kogakuin University

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Other Title
  • 銅・亜鉛還元カラムを用いる水中の硝酸イオン及び全窒素の吸光光度定量
  • ドウ アエン カンゲン カラム オ モチイル スイチュウ ノ ショウサン イオ

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Abstract

An 80 ml of sample solution (0.11 mgN) was adjusted to pH 1011 with a sodium hydroxide solution and to 0.01 M EDTA with an EDTA solution, and then diluted to 100 ml with pure water. The treated solution was pumped at 2 ml/min into a converter (18 cm high and 8 mm diameter) containing copper-zinc grains, which converted the nitrate ion to ammonia. As the concentration (activity) of the zinc ion in converter decreased, the reduction efficiency (NO3-→NH3) increased. Thus, EDTA was added to the sample solution to decrease the concentration of zinc ions in the column. The ammonia in the effluent (10 ml) was determined by indophenol colorimetry (final volume, 50 ml). The EDTA in the effluent hardly affected the colorimetric determination of ammonia. When the concentration of EDTA was 0.03 M in the effluent, the absorbance of indophenol blue decreased by 1.6% of the maximum absorbance. Calibration curves of both the nitrate ion and ammonia almost agreed in the region 110 mgNil. The relative standard deviation (n =10) was 0.91 % for 2 mgN/l of the nitrate ion. The nitrate ion in seawater was well determined by this method using the standard-addition method.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 46 (4), 271-274, 1997

    The Japan Society for Analytical Chemistry

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