Reservoir NO3- pollution and chemical weathering: by dual isotopes of delta N-15-NO3-, delta O-18-NO3- and geochemical constraints
文献类型：期刊论文
| 作者 | Herath, Imali Kaushalya; Wu, Shengjun ; Ma, Maohua; Ping, Huang
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| 刊名 | ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
 |
| 出版日期 | 2022-01-25 |
| 页码 | 22 |
| 关键词 | Chemical weathering Nitrate pollution Dual isotopes Aquatic geochemistry Three Gorges Reservoir |
| ISSN号 | 0269-4042 |
| DOI | 10.1007/s10653-021-01195-4 |
| 通讯作者 | Herath, Imali Kaushalya(imalikaushalya@yahoo.com) ; Wu, Shengjun(wsg@cigit.ac.cn) |
| 英文摘要 | Reservoir dams alter the nutrient composition and biogeochemical cycle. Thus, dual isotopes of delta O-18-NO3- and delta N-15-NO3- and geochemical signatures were employed to study the NO3- pollution and chemical weathering in the Three Gorges Reservoir (TGR), China. This study found that the TGR dam alters the delta N-15-NO3- composition and is enriched in the recharge period. Values of delta N-15-NO3- varied from 4.5 to 12.9 parts per thousand with an average of 9.8 parts per thousand in the recharge period, while discharge period delta N-15-NO3- ranged from 3.2 to 12.5 parts per thousand, with an average of 9.3 parts per thousand. delta O-18-NO3- varies (1.2-11.3 parts per thousand) with an average of 6.5 parts per thousand and (2.4-12.4 parts per thousand) with an average of 7.5 parts per thousand, in the recharge and discharge periods, respectively. Stable isotopic values sharply decreased from upstream to downstream, indicating the damming effects. delta O-18-NO3- and delta N-15 NO3- confirm that sewage effluents, nitrification of soil organic material, and NH4+ fertilizers were the primary sources of NO3- in the reservoir. Carbonate weathering mainly provides ions to the reservoir. HOC3- + SO42- and Ca2+ + Mg2+ represent 90% of major ions in the TGR. Downstream sampling sites showed low solute concentration during the recharge period, indicating the dam effect on solute concentration. Ca-Mg-Cl-, Ca-HCO3- and Ca-Cl- were the main water types in the TGR. The average percentage of solutes contribution revealed the carbonate weathering, evaporites dissolution, silicate weathering, and atmospheric input were 51.9%, 41%, 7.8%, and 1.7% for the recharge period. In contrast, the discharge period contributed 66.4%, 29.2%, 10%, and 4.3%, respectively. TGR water is moderately suitable for irrigation, and hardness is high in drinking water. This study provides new insight into the dual isotopic approach and geochemical signatures to interpret the NO3- cycle and chemical weathering process under dam effects in the TGR. However, this isotopic application has some limitations in source identification, isotope fractionation, and transformation mechanisms of nitrate. Thus, further studies need to be done on these topics for a better undestanding. |
| 资助项目 | National Natural Science Foundation of China[41571497] ; National Natural Science Foundation of China[51779241] |
| WOS研究方向 | Engineering ; Environmental Sciences & Ecology ; Public, Environmental & Occupational Health ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000746759300001 |
| 出版者 | SPRINGER |
| 源URL | [http://119.78.100.138/handle/2HOD01W0/15071]  |
| 专题 | 中国科学院重庆绿色智能技术研究院 |
| 通讯作者 | Herath, Imali Kaushalya; Wu, Shengjun |
| 作者单位 | Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Key Lab Reservoir Aquat Environm, Chongqing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Herath, Imali Kaushalya,Wu, Shengjun,Ma, Maohua,et al. Reservoir NO3- pollution and chemical weathering: by dual isotopes of delta N-15-NO3-, delta O-18-NO3- and geochemical constraints[J]. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH,2022:22. |
| APA | Herath, Imali Kaushalya,Wu, Shengjun,Ma, Maohua,&Ping, Huang.(2022).Reservoir NO3- pollution and chemical weathering: by dual isotopes of delta N-15-NO3-, delta O-18-NO3- and geochemical constraints.ENVIRONMENTAL GEOCHEMISTRY AND HEALTH,22. |
| MLA | Herath, Imali Kaushalya,et al."Reservoir NO3- pollution and chemical weathering: by dual isotopes of delta N-15-NO3-, delta O-18-NO3- and geochemical constraints".ENVIRONMENTAL GEOCHEMISTRY AND HEALTH (2022):22. |
入库方式： OAI收割
来源：重庆绿色智能技术研究院
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