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농촌하천 유역의 주 오염원 추적을 위한 안정성 동위원소 질량비 분석
홍영진 ( Hong Young Jin ),김철성 ( Kim Chul Sung ),권순국 ( Kwun Soon Kuk ) 한국농공학회 1999 한국농공학회 학술대회초록집 Vol.1999 No.-
It has been acknowledged that fertilizer and animal waste have different ratio of <sup>15</sup>N/<sup>14</sup>N which is presented as a symbol of δ <sup>15</sup>N, and that the values of δ <sup>15</sup>N for fertilizer and animal waste are placed less than +8%<sub>0</sub> and higher than +10%<sub>0</sub>, respectively. By this reason, the demarcation range for the source nitrogen mass ratio is between +8 %<sub>0</sub> and + 10 %<sub>0</sub>. In this study, we would suggest a possible method to trace the major pollution basis using 'the nitrogen isotope analysis method for management of water quality.
안정 동위원소비를 이용한 농촌하천유역 질산성 질소의 오염원 추정
홍영진 ( Hong Young Jin ),권순국 ( Kwun Soon Kuk ),홍성구 ( Hong Seong Gu ) 한국농공학회 2001 韓國農工學會誌 : 전원과 자원 Vol.43 No.4
Pollution sources and their environmental contributions were investigated to select the best management practices for the effective control of water quality. The nitrogen isotope mass ratio was determined to estimate the nitrate sources and their contribution Sampling sites were chosen by calculating effluent loads at each watershed. Two liters each of the surface water samples were collected from four sites at Bokha river and two sites at Gwanri river. They were sequentially prepared through distillation method and analyzed using an isotope ratio mass spectrometer(IsoPrime EA). As revealed by the experimental values obtained, the mass ratio values(□ <sup>15</sup>N) of watersheds with a large amount of nonpoint sources were less than +5%, an indication that the samples were influenced by chemical fertilizers. However, watersheds with large amount of point sources were influenced not only by chemical fertilizers but also by animal and municipal wastes. The mass ratio values of samples generally decreased during rainy days. But, during dry days, the mass ratio values well-reflected the nitrate sources the condition of watersheds. Through this study, the nitrogen isotope mass ratio has been found to be useful for estimating nitrate sources and their contribution to the rural watersheds
농촌유역의 질소 오염원과 기여도 해석을 위한 δ <sup>15</sup>N 분석
홍영진 ( Hong Young Jin ),권순국 ( Kwun Soon Kuk ) 한국농공학회 2000 한국농공학회 학술대회초록집 Vol.2000 No.-
It has been acknowledged that fertilizer, natural soil nitrogen and animal waste, municipal waste have different mass ratio of nitrogen which is presented as a symbol of δ <sup>15</sup>N. and that the values of δ <sup>15</sup>N for fertilizer and natural soil nitrogen and animal waste are placed less than +5‰ and higher than +10‰, respectively. thus, Nitrogen pollution sources and contribution can be interpreted in watershed through δ <sup>15</sup>N analysis and then, analysis is performed with Kjeldhl-Dumas method. In this study, The values of δ <sup>15</sup>N are between +1.46‰ and +8.97‰, and the nitrate concentration is placed less than 3.31mg/L and higher than 0.19mg/L, respectively. Thus, this watershed is noncontamination area at the present time. But as a result of δ <sup>15</sup>N, contribution of natural soil nitrogen be discovered in this watershed, presently.