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KMID : 1059519910350010051
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Journal of the Korean Chemical Society
1991 Volume.35 No. 1 p.51 ~ p.58
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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 Nitrat
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Lee Heung-Lark
Yun Jong-Hoon
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Abstract
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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 (t99) under the optimum membrane composition (5% aliquat-NO3 solution ＋ 32% poly(vinyl chloride) ＋ 63% dibutyl sebecate) of the electrode were 58.5 ± 0.1 mV/decade, 2.0 × 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 × 10-5 M ∼ 5.0 × 10-2 M and 56.8 ± 0.2 mV/decade, respectively.
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