Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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A study on the testing method of discolored tap water by spectrophotometer

분광측색계에 의한 착색 수돗물 시험방법 연구

  • Dongheon Kim (Department of Environmental Engineering, Chungbuk National University) ;
  • Jonggeum Lee (Wateworks Headquarter, Cheongju City) ;
  • Jiyoon Oh (Wateworks Headquarter, Cheongju City) ;
  • Gitae Kim (Wateworks Headquarter, Cheongju City) ;
  • Hangbae Jun (Department of Environmental Engineering, Chungbuk National University)
  • 김동헌 (충북대학교 환경공학과) ;
  • 이종금 (청주시 상수도사업본부) ;
  • 오지윤 (청주시 상수도사업본부) ;
  • 김기태 (청주시 상수도사업본부) ;
  • 전항배 (충북대학교 환경공학과)
  • Received : 2023.06.12
  • Accepted : 2023.07.14
  • Published : 2023.08.15
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Abstract

This study focuses on the application of a new measurement method that quantifies the residual color of filtered water using a spectrocolorimeter after filtering the discolored substances. It was confirmed through the color and turbidity cross-test that the discolored substances cannot be measured effectively with the current legal color and turbidity test method. Therefore, the National Institute of Environmental Research's filter testing method, which involves filtering the sample through 0.45 ㎛ filter and visually inspecting the color, was improved. A membrane filter colorimetry (MFC) method was established by measuring the color difference (ΔE*ab(65)) of the filtered filter using a spectrophotometer and expressing it as filter color unit (FCU). Using the MFC method, the FCU for reference materials such as iron and manganese, as well as field samples, was measured. The results showed a high correlation with turbidity, and the color difference patterns varied depending on the type of reference materials and field samples. This indicates that the MFC method is an effective new measurement method of discolored tap water.

Keywords

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