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- W836293449 abstract "Nitrate concentration and 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() 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 values. The average nitrate nitrogen concentrations were and average values were +4.3+9.7. From the nitrate concentration and value observed, the types of the groundwater could be categorized into four groups, such as high and high nitrate, high and medium nitrate, low and medium nitrate, and low 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 value was higher than the 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." @default.
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- W836293449 date "1995-01-01" @default.
- W836293449 modified "2023-09-23" @default.
- W836293449 title "Nitrate Concentration and ${delta}^{15}N$ Value of the Groundwater in the Miyakojima Island, Okinawa Prefecture, Japan" @default.
- W836293449 hasPublicationYear "1995" @default.
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