Gas-Sensing Membrane Electrodes for the Determination of Dissolved Gases (III). Continuous-Automated Determination of Nitrite Ion Using a New Tubular PVC Membrane Type of Selective Electrode Nitrate

溶解氣體 分析用 氣體感應膜 이온選擇性 電極 (第 3 報). 새로운 管形 PVC膜 질산이온 選擇性 電極을 이용한 아질산이온의連續·自動化 定量

  • Lee Heung Lark (Department of Chemistry, College of Natural Sciences, Kyungpook National University) ;
  • Yun Jong-Hoon (Environmental Science Institute, Kyungpook National University)
  • 이흥락 (경북대학교 자연과학대학 화학과) ;
  • 윤종훈 (경북대학교 자연과학대학 화학과)
  • Published : 1991.02.20

Abstract

A new tubular poly(vinyl chloride) membrane type of nitrate selective electrode was prepared and its characteristics were evaluated. The response slope, detection limit, and response time (t$_{99}$) under the optimum membrane composition (5${\%}$ aliquat-NO$_3$ solution + 32${\%}$ poly(vinyl chloride) + 63${\%}$ dibutyl sebecate) of the electrode were 58.5 ${\pm}$ 0.1 mV/decade, 2.0 ${\times}$ 10$^{-5}$ M, and 25 seconds, respectively. The nitrite ion was determined by the continuous-automated method using the new electrode. 10$^{-2}$ M phosphate buffer solution (pH 7.6) was used as a recipient solution. And also hydrogen peroxide (0.3${\%}$) was added to the recipient as an oxidant. The linear response range and response range and response slope for the standard nitrite solution under the optimum condition of this electrode system were 8.0 ${\times}$ 10$^{-5}$ M ∼ 5.0 ${\times}$ 10$^{-2}$ M and 56.8 ${\pm}$ 0.2 mV/decade, respectively.

Keywords

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