선택성 이온전극방식의 염소이온 센서의 성능향상에 관한 연구

다국어 초록 (Multilingual Abstract)

In this study, among the electrochemical principles, an ion-selective electrode type sensor was systematically measured for chemical reactivity, response electromotive force, and various through the composition change, the newly manufactured sensor was compared and measured to improve the problems of the existing sensor, and finally, the reliability verification was completed with the performance test by comparing and measuring the titration method equipment in the actual sample. Existing sensors had problems such as the effect of negative ions, fluctuations in electromotive force, lowering of electromotive force, and whitening. Divide these problems according to symptoms
1. A standard electromotive force is formed and the drop of the electromotive force is improved by changing the diameter of the internal reference electrode,
2. The change in the composition of the internal electrolyte solution improves the fluctuation and deviation width of the electromotive force,
3. After changing the immersion solution of the reference electrode, it prevents whitening and decrease in lifespan,
4. Suppresses the influence of interfering anions by changing the composition ratio of the external selective ion electrode.
5. Finish with verification through comparison with titration method equipment.
Among the sensor components, the porous membrane that controls & responds to the external reaction of the electrode is a diatomaceous earth membrane with a diameter of 5⦽ and a pore size of less than 1 μm.
The internal electrolyte was prepared by mixing based on potassium chloride (KCl) + potassium nitrate (KNO3) in a gel-type. The reference electrode (RE), which undergoes an internal electrochemical reaction, induces a reaction with the internal electrolyte by depositing silver (Ag) wire with sodium hypochlorite (NaOCl). A selective ion electrode (ISE) was prepared by synthesizing AgNO3, Na2S, and KCl. The newly built chlorine ion (Ag/AgCl) sensor can be used as the most responsive and durable chlorine ion sensor to evaluate raw concrete used in reinforced concrete (RC) structures currently in use by improving the sensor components.

목차 (Table of Contents)

• Abstract ······················································································ⅰ
• 목차 ····························································································ⅲ
• 표 목차 ·······················································································ⅴ
• 그림 목차 ·················································································· ⅵ
• Ⅰ. 서론 ····················································································· 1
• 1.1. 연구배경 ········································································ 1
• 1.2. 연구목적 ········································································ 3
• Ⅱ. 기존문헌 연구 ········································································ 5
• 2.1. 철근콘크리트 부식의 이론배경 ·········································· 5
• 2.2. 염화물에 의한 부식의 이론배경 ········································ 7
• Ⅲ. 실험방법 ················································································ 9
• 3.1. 내부 기준전극의 제작 및 침지 후 면적 별 반응성 평가 ······· 9
• 3.2. 내부 전해질용액의 조성변화 비교 평가 ····························· 11
• 3.3. 내부 기준전극(RE)의 침지수용액의 변경 후 표면상태 및
• 반응성 평가 ····································································· 13
• 3.4. 외부 기준전극(External Reference Electrode)의 조성비
• 변화 비교평가 ···································································· 15
• 3.5. 적정법측정기기와 교차비교 평가 ······································ 17
• Ⅳ. 실험결과 및 분석고찰 ···························································· 18
• 4.1. 내부 기준전극의 제작 및 침지 후 면적 별 반응성 평가 ······ 18
• 4.2. 내부 전해질용액의 조성변화 비교 평가 ····························· 24
• 4.3. 내부 기준전극(RE)의 침지수용액의 변경 후 표면상태 및
• 반응성 평가 ····································································· 32
• 4.4. 외부 기준전극(External Reference Electrode)의 조성비
• 변화 비교평가 ···································································· 36
• 4.5. 적정법측정기기와 교차비교 평가 ······································ 42
• Ⅴ. 결론 ····················································································· 47
• Ⅵ. 참고문헌 ··············································································· 48
• Ⅶ. 부록 ····················································································· 50