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일본 궁고도의 (宮古島) 지하수중의 NO3-N 와 δ15N 치
박광래,태택희구웅 (態澤喜久雄) ( Kwang Lai Park,Kikuo Kumazawa ) 한국환경농학회 1995 한국환경농학회지 Vol.14 No.1
Nitrate concentration and δ^(15)N value in the groundwater in Miyakojima Island, Okinawa, were measured during 1992-1993. Water from the shallow and the deep wells at the ten separate sites were sampled. Mineral contents and natural nitrogen isotope abundance(δ^(15)N) were analyzed using a liquid chromatography and a mass spectrometry (Finnigan MAT 252). Except for waters which were directly influenced by sea water invasion, most of the groundwater showed small variations among their mineral contents and δ^(15)N values. The average nitrate nitrogen concentrations were 1.4∼11.5㎎L^(-1) and average δ^(15)N values were +4.3∼+9.7‰. From the nitrate concentration and δ^(15)N value observed, the types of the groundwater could be categorized into four groups, such as high δ^(15)N and high nitrate, high δ^(15)N and medium nitrate, low δ^(15)N and medium nitrate, and low δ^(15)N and low nitrate, reflecting the main source of nitrate contamination, such as animal and domestic waste, animal waste and soil organic matter, soil organic matter and chemical fertilizer, and chemical fertilizer, respectively. It was discussed that the lowest δ^(15)N value was higher than the δ^(15)N value of the chemical fertilizers used in this island(-3.9∼-1.4%), then considerable amounts of nitrogen must be lost by ammonium evaporation or denitrification after fertilization.
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