中文关键词硝酸盐△¹⁵ N-NO₃^-△¹⁸ O-NO₃^-污染源Cl^- 英文关键词nitrate△¹⁵ N-NO₃^-△¹⁸ O-NO₃^-pollution sourcechloride

作者	单位	E-mail
李艳利	河南理工大学资源环境学院, 焦作 454000	liyanli@hpu.edu.cn
杨梓睿	河南理工大学资源环境学院, 焦作 454000
尹希杰	国家海洋局第三海洋研究所海洋与海岸地质环境开放实验室, 厦门 361005
孙伟	河南理工大学资源环境学院, 焦作 454000

中文摘要 2016年5月（枯水期）和2016年8月（丰水期）分别在太子河下游采集河流表层水样14个.为了识别河流硝酸盐来源及迁移转化过程，分别采用离子交换法，叠氮法和CO₂-H₂O平衡法测定水样的ρ（Cl^-）、ρ（NO₃^-）、△¹⁵ N-NO₃^-、△¹⁸ O-NO₃^-值，测定△¹⁸ O-H₂O.结果表明：不同采样期，硝酸盐主要来自于多种源的混合.枯水期，北沙河上游支流硝酸盐来源主要是土壤N及生活污水及畜禽粪便，中下游硝酸盐主要来自于化学肥料和生活污水及畜禽粪便.南沙河硝酸盐主要来自于生活污水及畜禽粪便.海城河上游、中游和下游硝酸盐分别来自于土壤N，生活污水及畜禽粪便和化学肥料，生活污水及畜禽粪便.丰水期，北沙河硝酸盐来源可能主要是土壤N、化学肥料和生活废水及畜禽粪便.南沙河和海城河中下游硝酸盐主要来自于化学肥料及生活废水及畜禽粪便，海城河上游河流硝酸盐主要来自于土壤N和化学肥料.从枯水期至丰水期，ρ（NO₃^-）、ρ（NH₄⁺-N）均呈现降低的趋势，而△¹⁵ N-NO₃^-值有增加的趋势，说明丰水期可能发生了氨的挥发和硝酸盐的反硝化过程.丰水期△¹⁵ N-NO₃^-与1/ρ（NO₃^-）呈轻微的正相关关系，说明丰水期河流发生了简单的混合过程.本研究的结果可为平原区域的硝酸盐污染来源的季节差异研究提供参考. 英文摘要 A total of 14 samples were collected in May 2016(dry season)and August 2016 (wet season) in the downstream area of the Taizi River. △¹⁵ N-NO₃^- and △¹⁸ O-NO₃^- were determined using the azide method, and △¹⁸ O-H₂O was determined using a CO₂-H₂O equilibration technique. To identify NO₃^- sources and transformations in the downstream area of Taizi River Basin, ion chromatography, Nessler's reagent spectrophotometry, the azide method, and CO₂-H₂O equilibration methods were utilized to determine the concentrations of NO₃^-, Cl^-, NH₄⁺-N, and isotopic compositions (△¹⁵ N and △¹⁸ O) of NO₃^- and the △¹⁸ O-H₂O in surface water. The results showed that the NO₃^- was mainly derived from mixed sources. During the dry season, the nitrate in the surface water was derived from soil nitrogen, manure, and sewage in the upper reaches, and mainly derived from synthetic fertilizer, manure, and sewage in the middle and lower reaches of the Beisha River. The nitrate was mainly derived from manure and sewage in the Nansha River. The nitrate was mainly derived from soil nitrogen in the upper reaches, mainly derived from synthetic fertilizer, manure, and sewage in the middle reaches, and mainly derived from manure and sewage in the lower reaches of the Haicheng River. During the wet season, the nitrate sources in surface water were soil nitrogen, synthetic fertilizer, manure, and sewage in the Beisha River; synthetic fertilizer, manure, and sewage in the middle and lower reaches of the Haicheng River and the Nansha River; and soil nitrogen and synthetic fertilizer in the upper reaches of the Haicheng River. NO₃^- and NH₄⁺-N concentrations decreased with increasing △¹⁵ N-NO₃^- from the dry season to the wet season, indicating that volatilization of NH₄⁺-N and denitrification of NO₃^- might occur during the wet season. There is a slightly positive relationship between the reciprocal of the concentration of 1/ρ(NO₃^-) and △¹⁵ N-NO₃^- during the wet season, indicating that mixing processes occurred in surface water. The results will provide information on nitrate sources during seasonal variations in the plain areas.

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