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논문 기본 정보

자료유형
학술대회자료
저자정보
Jung, Dae-Hyun (Department of Biosystems and Biomaterial Engineering, College of Agriculture and Life Sciences, Seoul National University) Kim, Dong-Wook (Department of Biosystems and Biomaterial Engineering, College of Agriculture and Life Sciences, Seoul National University) Cho, Woo Jae (Department of Biosystems and Biomaterial Engineering, College of Agriculture and Life Sciences, Seoul National University) Kim, Hak-Jin (Department of Biosystems and Biomaterial Engineering, College of Agriculture and Life Sciences, Seoul National University)
저널정보
한국농업기계학회 한국농업기계학회 학술발표논문집 한국농업기계학회 2017년도 춘계공동학술대회
발행연도
2017.1
수록면
122 - 122 (1page)

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Recently, environmental problems have become an area of growing interests. In-situ monitoring of water quality is fundamental to most environmental applications. The accurate measurement of nitrate concentrations is fundamental to understanding biogeochemistry in aquatic ecosystems. Several studies have reported that one of the most feasible methods to measure nitrate concentration is the use of Ion Selective-electrodes (ISEs). The ISE application to water monitoring has several advantages, such as direct measurement methodology, high sensitivity, wide measurement range, low cost, and portability. However, the ISE methods may yield inconsistent results where there was a difference in temperature between the calibration and measurement solutions, which is associated with the temperature dependence of ionic activity coefficients in solution. In this study, to investigate the potential of using the combination of a temperature sensor and nitrate ISEs for minimizing the effect of temperature on real-time nitrate sensing in natural water, a prototype of on-site water monitoring system was built, mainly consisting of a sensor chamber, an array of 3 ISEs, an waterproof temperature sensor, an automatic sampling system, and an arduino MCU board. The analog signals of ISEs were obtained using the second-order Sallen-key filter for performing voltage following, differential amplification, and low pass filtering. The performance test of the developed water nitrate sensing system was conducted in a monitoring station of drinking water located in Jeongseon, Kangwon. A temperature compensation method based on two-point normalization was proposed, which incorporated the determination of temperature coefficient values using regression equations relating solution temperature and electrode signal determined in our previous studies.

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