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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 35, Number 1
JKCSEZ 35(1)
February 20, 1991 

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

용해기체 분석용 기체감응막 이온선택성 전극 (제 3 보). 새로운 관형 PVC막 질산이온 선택성 전극을 이용한 아질산이온의 연속·자동화 정량
Heung Lark Lee, Jong-Hoon Yun

이흥락, 윤종훈
새로운 관형 PVC막 질산이온 선택성 전극을 제작하여 그 성능을 조사하였다. 전극막의 조성을 5% aliquat-NO3 용액+ 32% poly(vinyl chloride) + 63% dibutyl sebecate로 하였을 때 전극의 감응특성이 최적이었으며, 이 때의 감응기울기는 58.5 ± 0.1 mV/decade, 검출한계는 0.02mM, 감응시간 (t99)은 25초이었다. 이 전극을 써서 아질산이온을 連續·自動化法으로 정량하였따. Recipient 용액은 pH 7.6의 10-2 M 인산염 완충용액을 쓰고, 여기에 산화제로서 과산화수소를 0.3%가 되도록 포함시켰다. 전극계의 측정조건에서 아질산이온 수집용액 8.0 × 10-5 M ∼ 5.0 × 10-2 M의 범위에서 직선적인 감응을 나타내었으며, 이 때의 감응기울기는 56.8 ± 0.2 mV/decade이었다.

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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