유리염소 측정을 위한 일회용 스트립 센서
Disposable Strip-type Sensors for Detection of Free Chlorine
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초록
수질 분석에서 염소 소독제 잔류량 측정은 세균학적 안전성 확보와 염소의 과다 주입을 억제하기 위한 수단으로 매우 중요한 의미를 갖는다. 이러한 휴대용 잔류염소 측정기 개발을 위한 일회용 유리염소 스트립 센서를 스크린 프린팅 기술을 이용한 탄소 전극으로 제작하였다. 탄소 전극은 금과 백금 전극에 비해 결합염소(특히 NH2Cl) 방해종에 대한 영향이 적었으며, –0.3 V(vs.Ag/AgCl) 인가전위에서 유리염소에 대해 안정한 감응성을 나타냈다. 이렇게 제작된 탄소 전극에 모세관현상으로 일정량의 시료를 재현성 있게 도입할 수 있는 유로구조를 갖는 일회용 스트립센서로 제작하였고, 잔류 유리염소의 분석에 적용하였다.
Abstract
The measurement of residual chlorine as a disinfectant is very important to ensure the safety against the pathogenic microbes and to suppress injection. The portable free chlorine sensor was fabricated with a disposable strip format by a screen printing method. The strip sensors prepared with a carbon-Ag/AgCl(cathode-anode) combination exhibited less interfering responses towards combined chlorine species(especially NHCl2) and oxygen than the sensors prepared with other metals(i.e., gold and platinum). Free chlorine was determined chronoamperometrically with carbon-based electrodes at an applied potential of –0.3 V(vs. Ag/AgCl). A channel was built on the strip-type electrode for easy sampling, and the resulting strip sensors were employed to determine the concentrations of residual free chlorine.
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