Journal of Biosystems Engineering

  • 제32권1호
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  • Pages.37-43
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  • 2007
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  • 1738-1266(pISSN)
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  • 2234-1862(eISSN)
한국농업기계학회 (Korean Society for Agricultural Machinery)
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수경재배 시 다량 이온 농도 측정을 위한 이온 선택성 전극의 응용

Application of Ion-Selective Electrodes to Measure Ionic Concentrations of Macronutrients in Hydroponics

  • Kim, Min-Su (School of Biosystems Engineering, Seoul National University) ;
  • Park, Tu-San (School of Biosystems Engineering, Seoul National University) ;
  • Cho, Seong-In (School of Biosystems Engineering, Seoul National University)
  • 발행 : 2007.02.25
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초록

This study was carried out to investigate the applicability of PVC membrane-based ion-selective electrodes for macronutrients (K, Ca, and N) by measuring of potassium, calcium, nitrate ions in hydroponic nutrient solution. The capabilities of two ion-selective membranes with varying chemical compositions for each ion were evaluated in terms of sensitivity, selectivity, and lifetime to choose sensing elements suitable for measuring typical ranges of nutrient concentrations in hydroponic solutions. The selected calcium and nitrate ion-selective membranes showed effectively sensitive responses to calcium and nitrate ions with lifetimes of 25 and 15 days, respectively. The addition of a cation additive to the potassium membrane cocktail allowed its sensitivity to be increased whereas its lifetime was reduced from 30 days to 10 days.

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참고문헌

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