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2022 Vol.55, Issue 1 Preview Page

Short communication

Determination of Dissolved Organic Carbon Concentrations Using UV-Visible Absorbance for Water Samples in a Rural Watershed, the Republic of Korea
Young-Jae Jeong1
,
Su-Jin Lee2
,
Nuri Baek2
,
Hyun-Jin Park34*
,
Woo-Jung Choi5*
1Graduate Student, Department of Rural and Biosystems Engineering, Chonnam National University, Gwangju 61186, Korea
2Undergraduate Student, Department of Rural and Biosystems Engineering, Chonnam National University, Gwangju 61186, Korea
3Postdoctoral Research Fellow, Department of Rural and Biosystems Engineering, Chonnam National University, Gwangju 61186, Korea
4Postdoctoral Research Fellow, Department of Renewable Resources, University of Alberta, Edmonton, AB T6G 2E3, Canada
5Professor, Department of Rural and Biosystems Engineering & AgriBio Institute of Climate Change Management, Chonnam National University, Gwangju 61186, Korea
*Corresponding Author
28 February 2022. pp. 86-92
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Abstract

Dissolved organic carbon (DOC) in water discharged from agricultural land is one of the indicators of water pollution. As aromatic compounds, which is the main component of DOC, absorb light in the UV-visible region, the intensity of UV-visible absorbance is correlated with DOC concentrations in water. In this study, a regression equation between DOC concentration of reference samples (n = 12, extracts of manure composts) and UV-visible absorbance was established. The applicability of the established equation was tested using water samples (n = 44) collected from a rural watershed in Jeonnam, South Korea. The peak absorbance of DOC in the compost extracts was detected at 275 nm, and was positively correlated (R2 = 0.99, P < 0.001) with DOC concentrations. Although the DOC concentrations of water samples determined using the equation were lower than those measured by TOC analysis by about 15%, the estimated DOC concentrations were strongly (R2 = 0.96, RMSE = 0.97, P < 0.001) correlated with measured DOC concentrations. Our study suggests that the DOC concentrations of watershed can be estimated by measuring the UV-visible absorbance method.

The peak of UV-visible absorbance of dissolved organic carbon (DOC) in the compost extracts with different DOC concentrations was detected at 275 nm among the range of 200 - 500 nm.
Keywords
Absorbance
dissolved organic carbon
UV-visible
Water pollution
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Information
  • Publisher :Korean Society of Soil Science and Fertilizer
  • Publisher(Ko) :한국토양비료학회
  • Journal Title :Korean Journal of Soil Science and Fertilizer
  • Journal Title(Ko) :한국토양비료학회 학회지
  • Volume : 55
  • No :1
  • Pages :86-92
  • Received Date : 2022-02-03
  • Revised Date : 2022-02-09
  • Accepted Date : 2022-02-10
  • DOI :https://doi.org/10.7745/KJSSF.2022.55.1.086
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