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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 35, Number 2
JKCSEZ 35(2)
April 20, 1991 

 
Title
Characteristics and Preparation of Potassium Ion Selective Liquid Membrane Electrode Based on Polyurethane Matrix

폴리우레탄을 메트릭스로한 액막형 칼륨이온 선택성 전극의 제조 및 특성
Author
Kwang Sik Yoo, Yong Taek Lee, Chul Yong Kang

유광식, 이용탁, 강철용
Keywords
Abstract
기존 칼륨이온 선택성 전극의 메트릭스로는 대체로 PVC가 사용되어졌으나, 본 연구에서는 폴리우레탄을 사용하였고, 용매 매개체로는 2-nitropheny-n-alkylate, 감응물질로는 potassium tetraphenyl borate 및 D-18-Crown-6 등을 써서 전극막을 제조하였다. 본 폴리우레탄 메트릭스의 칼륨이온 선택성전극의 수명은 75일로서 PVC 메트릭스의 칼륨이온 선택성 전극에 비하여 한층 더 길었다. 전극전위응답(slope factor)은 직선응답범위(K+ 농도 : 1 × 10-1 ∼ 1 × 10-4 M)내에서 52 mV/decade이었고, 본 전극은 방해이온들 (NH4+, Na+, Li+, Ca2+, Mg2+, Cu2+)이 존재하는 해수 중의 칼륨이온을 B(Ph)4- 표준용액으로 전위차 적정시 종말점을 검출하는데 성공적으로 적용되었다.

Previous matrices of potassium ion selective electrodes are generally based on PVC. In this study, however, the electrode membrane was prepared with polyurethane matrix containing potassium tetraphenyl borate as sensing materials and D-18-Crown-6 and 2-nitrophenyl-n-alkylethers as solvent mediator. The average life time of the K+-selective electrode based on polyurethane was 75 days which is significantly longer than PVC based one. The slope factor in linear dynamic range (1 × 10-1 ∼ 1 × 10-4 M) was 52 mV/decade. The electrode has been successfully applied to find end point in potentiometric titration of K+ with tetraphenyl borate solution in the sea water, even in the presence of several interfering cations(NH4+, Na+, Li+, Ca2+, Mg2+, Cu2+).

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128 - 134
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