지질공학 (The Journal of Engineering Geology)

  • 제12권3호
  • /
  • Pages.285-294
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  • 2002
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  • 1226-5268(pISSN)
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  • 2287-7169(eISSN)
대한지질공학회 (The Korean Society of Engineering Geology)
권호 표지

피압대수층 지하수내 질소함유 원인연구: 질소, 산소, 수소동위원소 적용

Nitrate Contamination of Confined Groundwaters: Application of Nitrogen, Oxygen, and Hydrogen Isotopes

  • 추창오 (한국지질자원연구원 환경지질연구부) ;
  • 이병대 (한국지질자원연구원 환경지질연구부) ;
  • 조병욱 (한국지질자원연구원 환경지질연구부) ;
  • 성익환 (한국지질자원연구원 환경지질연구부) ;
  • 지세정 (한국지질자원연구원 환경지질연구부)
  • 발행 : 2002.09.01
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초록

피압대수층내 질소함유 원인규명을 위하여 질산성질소(NO3-N), 질소, 산소, 및 수소안정동위원소를 이용하였다. 전형적인 피압대수층인 먹는샘물업체의 지하수의 질산성질소를 분석한 결과, 1988-2001년 기간동안 60 여개의 먹는샘물 제조업체의 질산성질소의 총평균은 0.95 mg/$\ell$로서 매우 낮다. 이 기간동안 질산성질소의 함량이 지속적으로 2 mg/$\ell$ 이상으로 나타난 6개소에 대한 안정동위원소 분석결과, 산소동위원소 $\delta$8O 값은 -8.3~-11$\textperthousand$범위, 수소동위원소 $\delta$D 값은 약 -60~-75$\textperthousand$ 범위로서 전국 먹는샘물 지하수의 평균치와 흡사하다. 질소동위원소 $\delta$15N값은 -11.8~-5.1$\textperthousand$ 범위로서 가벼운 특성을 보여주고 있다. 따라서 본 연구대상 지하수의 질산성질소는 가축분뇨나, 유기질소, 또는 비료기원일 가능성은 없는 것으로 나타났다.

The origin of nitrate in confined groundwater was studied using oxygen ($\delta$180), hydrogen ($\delta$D), and nitrogen ($\delta$15N) stable isotopes, along with chemical data of NO3-N. We analyzed groundwaters from more than sixty manufactories producing natural mineral waters around the country During the period of 1998-2001, an average value of nitrate was fair]y low (0.95 mg/$\ell$), however, groundwaters from six sites showed more than 2 mg/$\ell$ of nitrate. The stable isotope data of the groundwaters are -8.3~-11 $\textperthousand$ $\delta$8O, -60~-75 $\textperthousand$ $\delta$D, which lies in an average range of the groundwaters. The nitrogen isotope data with -11.8~-5.1$\textperthousand$ $\delta$15N suggest that manure, organic nitrate, and fertilizers can not be the origin of nitrate in the goundwaters.

키워드

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