论文信息 - N15/N14 Ratios of Ground‐Water Nitrate, Long Island, New Yorka

N15/N14 Ratios of Ground‐Water Nitrate, Long Island, New Yorka

Nitrogen-isotope values (δN15) of ground-water nitrate on Long Island, New York, correlate with δN15 ranges of nitrate sources which contribute to the ground-water systems. The δN15 of nitrate in water from the upper glacial aquifer, the water-table aquifer on Long Island, shows a shift from lighter values in the eastern part of the island where land is used predominantly for agriculture, to heavier values toward New York City where land is used for suburban residences with septic systems or sewers. δN15 values for inorganic fertilizer, unfertilized cultivated fields, and animal wastes show a similar shift from low to high values: −3 ‰ to +2 ‰+ 2 ‰ to + 8 ‰ and +10 ‰ to +20 ‰, respectively. Nitrogen-isotope ratios of nitrate in water from the deeper Magothy aquifer indicate a mixed source of nitrate.

[1] K. Rykbost,et al. The Contribution of Fertilizer to the Ground Water of Long Islanda , 1976 .

[2] B. Katz,et al. Nitrogen in water in Nassau and Suffolk counties, Long Island, New York, in 1971 , 1977 .

[3] H. Ku,et al. Trends of Selected Ground‐Water Constituents from Infiltration Galleries, Southeast Nassau County, New Yorka , 1977 .

[4] J. M. Bremner,et al. Determination and Isotope-Ratio Analysis of Different Forms of Nitrogen in Soils: 3. Exchangeable Ammonium, Nitrate, and Nitrite by Extraction-Distillation Methods1 , 1966 .

[5] C. Kreitler,et al. Natural Soil Nitrate: The Cause of the Nitrate Contamination of Ground Water in Runnels County, Texasa , 1975 .

[6] H. Freyer,et al. Nitrogen-15 Variations in Fertilizer Nitrogen , 1974 .

[7] A. Mariotti,et al. Application de l'étude isotopique de l'azote en hydrologie et en hydrogéologie — Analyse des résultats obtenus sur un exemple précis: Le Bassin de Mélarchez (Seine-et-Marne, France) , 1977 .

[8] L. T. Kurtz,et al. Natural 15N Abundance in Soil, Leaves, and Grain as Influenced by Long Term Additions of Fertilizer N at Several Rates 1 , 1975 .

[9] G. Shearer,et al. Variation of 15N in Corn and Soil Following Application of Fertilizer Nitrogen 1 , 1973 .

[10] R. Kistler. Potassium-Argon Ages of Volcanic Rocks in Nye and Esmeralda Counties, Nevada , 1968 .