Isotopes in Environmental and Health Studies最新文献_第9页

Estimating atmospheric radon deviation using statistical coefficients: Sulaymaniyah city, Iraq, as a case of study. 用统计系数估计大气氡偏差:以伊拉克苏莱曼尼亚市为例研究。

IF 1.3 4区环境科学与生态学

Isotopes in Environmental and Health Studies Pub Date : 2023-05-01 DOI: 10.1080/10256016.2023.2195175

Adil M Hussein, Kamal O Abdullah, Aziz H Fattah, Ranjdar R Mohammed-Ali

{"title":"Estimating atmospheric radon deviation using statistical coefficients: Sulaymaniyah city, Iraq, as a case of study.","authors":"Adil M Hussein, Kamal O Abdullah, Aziz H Fattah, Ranjdar R Mohammed-Ali","doi":"10.1080/10256016.2023.2195175","DOIUrl":"https://doi.org/10.1080/10256016.2023.2195175","url":null,"abstract":"The authors studied the atmospheric radon concentration with associated meteorological parameters variation during the dust events from July to November 2017. We obtained the meteorological parameters data in weather station of Sulaymaniyah city, Iraq. In the environmental monitoring plan, the atmospheric radon fluctuated from 15 to 48 Bq m-3 around the mean value of 31.5 ± 7 Bq m-3 within the summer. In autumn, varied from 22 to 46 Bq m-3 with a mean value of 34 ± 12 Bq m-3. We employed this to determine the radon level anomalously. Using the modified statistical coefficients, such as the residual deviation (RD), residual fluctuation ratio (RFR), F-test, and p-value coefficients. Among the atmospheric radon fluctuation values, particularly one anomalous (42 Bq m-3) on 25 July was determined because the excessive value of the RD was 1.9 σ, and the RFR value was 66 %. Corresponding to our coefficients criteria, the minimum level of atmospheric radon (22 Bq m-3) does not consider anomalous because of increasing wind speed. Based on this, our method for determining the atmospheric radon anomalies that are influenced by the missed factors beyond the mentioned meteorological parameters is accurate.","PeriodicalId":14597,"journal":{"name":"Isotopes in Environmental and Health Studies","volume":"59 2","pages":"202-215"},"PeriodicalIF":1.3,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9811144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High δ¹³C values in red squirrels Sciurus vulgaris explained by a reliance on conifer seeds. 红松鼠对针叶树种子的依赖解释了其高δ13C值。

IF 1.3 4区环境科学与生态学

Isotopes in Environmental and Health Studies Pub Date : 2023-05-01 DOI: 10.1080/10256016.2023.2179045

Tatyana N Karmanova, Natalia Y Feoktistova, Alexei V Tiunov

{"title":"High δ13C values in red squirrels Sciurus vulgaris explained by a reliance on conifer seeds.","authors":"Tatyana N Karmanova, Natalia Y Feoktistova, Alexei V Tiunov","doi":"10.1080/10256016.2023.2179045","DOIUrl":"https://doi.org/10.1080/10256016.2023.2179045","url":null,"abstract":"Eurasian red squirrels Sciurus vulgaris have unusually high δ13C values compared to other forest rodents, which is seemingly related to the consumption of 13C-enriched conifer seeds. To test this hypothesis, we analyzed the hair of wild and zoo-kept red squirrels, seeds of pine and spruce, and feathers of specialized and opportunistic consumers of conifer seeds, crossbills Loxia spp., and woodpeckers Dendrocopos major. Data on the isotopic composition (δ13C and δ15N values) of hair or feathers of other species of forest rodents and birds were obtained from published studies. The range of mean δ13C values of hair of wild forest rodents (19 species) exceeded 10 ‰. All squirrel species had high 13C content, S. vulgaris having maximum δ13C values. In contrast, S. vulgaris kept in captivity had an isotopic composition similar to other captive rodents. The feathers of crossbills were enriched in 13C compared to other forest birds (15 species), while seeds of coniferous trees often had higher δ13C values compared to seeds of other woody plants. Distinctiveness of the isotopic composition of mammals and birds feeding on the seeds of coniferous trees suggests that this resource can be traced through the entire forest food web.","PeriodicalId":14597,"journal":{"name":"Isotopes in Environmental and Health Studies","volume":"59 2","pages":"180-191"},"PeriodicalIF":1.3,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9433839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The first indoor radon mapping in the Campania region, Italy. 意大利坎帕尼亚地区首次室内氡测绘。

IF 1.3 4区环境科学与生态学

Isotopes in Environmental and Health Studies Pub Date : 2023-05-01 DOI: 10.1080/10256016.2023.2189249

Fabrizio Ambrosino, Giuseppe La Verde, Carlo Sabbarese, Vincenzo Roca, Antonio D'Onofrio, Mariagabriella Pugliese

引用次数: 3

Nitrate isotopes (δ¹⁵N, δ¹⁸O) in precipitation: best practices from an international coordinated research project. 降水中的硝酸盐同位素(δ15N， δ18O):来自国际协调研究项目的最佳实践。

IF 1.3 4区环境科学与生态学

Isotopes in Environmental and Health Studies Pub Date : 2023-05-01 DOI: 10.1080/10256016.2023.2177649

Germain Esquivel-Hernández, Ioannis Matiatos, Ricardo Sánchez-Murillo, Yuliya Vystavna, Raffaella Balestrini, Naomi S Wells, Lucilena R Monteiro, Somporn Chantara, Wendell Walters, Leonard I Wassenaar

{"title":"Nitrate isotopes (δ15N, δ18O) in precipitation: best practices from an international coordinated research project.","authors":"Germain Esquivel-Hernández, Ioannis Matiatos, Ricardo Sánchez-Murillo, Yuliya Vystavna, Raffaella Balestrini, Naomi S Wells, Lucilena R Monteiro, Somporn Chantara, Wendell Walters, Leonard I Wassenaar","doi":"10.1080/10256016.2023.2177649","DOIUrl":"https://doi.org/10.1080/10256016.2023.2177649","url":null,"abstract":"Stable isotope ratios of nitrogen and oxygen (15N/14N and 18O/16O) of nitrate (NO3-) are excellent tracers for developing systematic understanding of sources, conversions, and deposition of reactive atmospheric nitrogen (Nr) in the environment. Despite recent analytical advances, standardized sampling of NO3-) isotopes in precipitation is still lacking. To advance atmospheric studies on Nr species, we propose best-practice guidelines for accurate and precise sampling and analysis of NO3- isotopes in precipitation based on the experience obtained from an international research project coordinated by the International Atomic Energy Agency (IAEA). The precipitation sampling and preservation strategies yielded a good agreement between the NO3- concentrations measured at the laboratories of 16 countries and at the IAEA. Compared to conventional methods (e.g., bacterial denitrification), we confirmed the accurate performance of the lower cost Ti(III) reduction method for isotope analyses (15N and 18O) of NO3- in precipitation samples. These isotopic data depict different origins and oxidation pathways of inorganic nitrogen. This work emphasized the capability of NO3- isotopes to assess the origin and atmospheric oxidation of Nr and outlined a pathway to improve laboratory capability and expertise at a global scale. The incorporation of other isotopes like 17O in Nr is recommended in future studies.","PeriodicalId":14597,"journal":{"name":"Isotopes in Environmental and Health Studies","volume":"59 2","pages":"127-141"},"PeriodicalIF":1.3,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9440527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Determination of nitrate sources in a karst plateau reservoir based on nitrogen and oxygen isotopes. 基于氮氧同位素测定喀斯特高原储层中硝酸盐来源。

IF 1.3 4区环境科学与生态学

Isotopes in Environmental and Health Studies Pub Date : 2023-05-01 DOI: 10.1080/10256016.2023.2176850

Jie Kong, Zhongfa Zhou, Yongliu Li, Xianmei Liu, Chaocheng Wen, Jiangting Xie

{"title":"Determination of nitrate sources in a karst plateau reservoir based on nitrogen and oxygen isotopes.","authors":"Jie Kong, Zhongfa Zhou, Yongliu Li, Xianmei Liu, Chaocheng Wen, Jiangting Xie","doi":"10.1080/10256016.2023.2176850","DOIUrl":"https://doi.org/10.1080/10256016.2023.2176850","url":null,"abstract":"Investigating the sources, migration and proportional contribution of nitrate is essential to effectively protect water quality. δ15N-NO3-, δ18O-NO3- and Stable Isotope Analysis in R (SIAR) were used to qualitatively and quantitatively analyse nitrate sources in the Pingzhai Reservoir water body. The values of δ15N-NO3- and δ18O-NO3- in water vary with season. Soil organic nitrogen and chemical fertilisers are the main sources of nitrate in autumn, while domestic sewage and livestock manure are the primary sources of nitrate in winter and spring. The SIAR results showed that chemical fertilisers, livestock manure, sewage, and soil organic nitrogen had the highest proportional contribution. In autumn, the proportional contribution of chemical fertilisers to river and reservoir were 47 and 51 %. During winter, the proportional contributions of livestock manure and sewage to river and reservoir were 53 and 68 %, respectively, and in spring 49 and 68 %, respectively. Considering the fragility of karst ecosystems, strict measures should be formulated for the use of chemical fertilisers and standards for sewage discharge should be raised. Control nitrogen input from agricultural activities and prevent water quality deterioration.","PeriodicalId":14597,"journal":{"name":"Isotopes in Environmental and Health Studies","volume":"59 2","pages":"142-160"},"PeriodicalIF":1.3,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9495087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A comprehensive study of the parameters affecting the stable isotopes in the precipitation of the Bangkok metropolitan area using model-based statistical approaches. 利用基于模型的统计方法对影响曼谷大都市区降水中稳定同位素的参数进行了综合研究。

IF 1.3 4区环境科学与生态学

Isotopes in Environmental and Health Studies Pub Date : 2023-05-01 DOI: 10.1080/10256016.2023.2178431

Mojtaba Heydarizad, Nathsuda Pumijumnong, Masoud Minaei, Javad Eskandari Mayvan, Danial Mansourian

{"title":"A comprehensive study of the parameters affecting the stable isotopes in the precipitation of the Bangkok metropolitan area using model-based statistical approaches.","authors":"Mojtaba Heydarizad, Nathsuda Pumijumnong, Masoud Minaei, Javad Eskandari Mayvan, Danial Mansourian","doi":"10.1080/10256016.2023.2178431","DOIUrl":"https://doi.org/10.1080/10256016.2023.2178431","url":null,"abstract":"This study determined the main local and regional parameters affecting the stable isotopes (18O, 2H) in the Bangkok precipitation and developed the Bangkok meteoric water line (BMWL) (δ2H = (7.68 ± 0.07) δ18O + (7.25 ± 0.48)). First, Pearson correlation coefficients were used to determine the correlation between local and regional parameters. Six different regression methods were used based on Pearson correlation coefficients. The stepwise regression had the most accurate performance among them according to the R2 values. Second, three different methods were used to develop the BMWL, and their performances were also studied. Third, the stepwise regression method was used to study the effects of local and regional parameters on the stable isotope content of precipitation. The results showed that the local parameters had a greater effect on the stable isotope content than the regional ones. The stepwise models developed based on the northeast and southwest monsoons showed that moisture sources also affected the stable isotope content of precipitation. Finally, the developed stepwise models were validated by calculating the root mean square error (RMSE) and R2. This study demonstrated that the local parameters mainly controlled the stable isotopes in the Bangkok precipitation, while the regional parameters had a slight effect on them.","PeriodicalId":14597,"journal":{"name":"Isotopes in Environmental and Health Studies","volume":"59 2","pages":"161-179"},"PeriodicalIF":1.3,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9440526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

New insights into diffusive kinetic fractionation during liquid condensation under supersaturated environment: an alternative approach for isotope tagging of ground-level water vapour. 过饱和环境下液体冷凝过程中扩散动力学分馏的新见解:地面水蒸气同位素标记的替代方法。

IF 1.3 4区环境科学与生态学

Isotopes in Environmental and Health Studies Pub Date : 2023-03-01 DOI: 10.1080/10256016.2022.2153126

Akash Ganguly, Virendra Padhya, Harsh Oza, Gerhard Strauch, Rajendrakumar D Deshpande

{"title":"New insights into diffusive kinetic fractionation during liquid condensation under supersaturated environment: an alternative approach for isotope tagging of ground-level water vapour.","authors":"Akash Ganguly, Virendra Padhya, Harsh Oza, Gerhard Strauch, Rajendrakumar D Deshpande","doi":"10.1080/10256016.2022.2153126","DOIUrl":"https://doi.org/10.1080/10256016.2022.2153126","url":null,"abstract":"Stable water isotopes in ground-level vapour are key to estimating water exchange between geospheres. Their sampling, however, is limited to laser-absorption spectrometers and satellite observations, having inherent shortcomings. This study investigates diffusive kinetic fractionation during liquid condensation under supersaturated environment, providing a cost-effective, reliable way of sampling ground-level vapour isotopes (18O, 2H). Experiments were undertaken at three locations in India with 'liquid' samples collected from condensation of ambient air at 0°C. Simultaneously, pristine 'vapour' was sampled via cryogenic-trapping using liquid nitrogen-alcohol slush at -78°C. The 'liquid' condensed under supersaturation was progressively more depleted in 18O, and less enriched in 2H than expected under equilibrium fractionation, with an increasing degree of supersaturation expressed as saturation index (Si). This study revealed: (1) Si, molecular density, Rh, T together control the extent of isotopic kinetic fractionation. (2) The presence of diffusive concentration gradient inhibits the flow of heavier isotopes during liquid condensation. (3) The stochastic nature of the process cannot be explained using a physics-based model alone. The artificial neural network model is hence deployed to sample δ18O (δ 2H) within -0.24 ± 1.79‰ (0.53 ± 11.23 ‰) of true value. (4) The approach can be extended to ground-validate isotope-enabled general circulation models and satellite observations.","PeriodicalId":14597,"journal":{"name":"Isotopes in Environmental and Health Studies","volume":"59 1","pages":"1-26"},"PeriodicalIF":1.3,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9743626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Combining δ¹³C and δ¹⁵N from bone and dentine in marine mammal palaeoecological research: insights from toothed whales. 海洋哺乳动物古生态研究中骨和牙本质δ13C和δ15N的结合:来自齿鲸的见解。

IF 1.3 4区环境科学与生态学

Isotopes in Environmental and Health Studies Pub Date : 2023-03-01 DOI: 10.1080/10256016.2022.2145285

Alba Rey-Iglesia, Tess Wilson, Jennifer Routledge, Mikkel Skovrind, Eva Garde, Mads Peter Heide-Jørgensen, Paul Szpak, Eline D Lorenzen

{"title":"Combining δ13C and δ15N from bone and dentine in marine mammal palaeoecological research: insights from toothed whales.","authors":"Alba Rey-Iglesia, Tess Wilson, Jennifer Routledge, Mikkel Skovrind, Eva Garde, Mads Peter Heide-Jørgensen, Paul Szpak, Eline D Lorenzen","doi":"10.1080/10256016.2022.2145285","DOIUrl":"https://doi.org/10.1080/10256016.2022.2145285","url":null,"abstract":"Stable carbon (δ13C) and nitrogen (δ15N) isotopic compositions of bone and dentine collagen extracted from museum specimens have been widely used to study the paleoecology of past populations. Due to possible systematic differences in stable isotope values between bone and dentine, dentine values need to be transformed into bone-collagen equivalent using a correction factor to allow comparisons between the two collagen sources. Here, we provide correction factors to transform dentine δ13C and δ15N values into bone-collagen equivalent for two toothed whales: narwhal and beluga. We sampled bone and dentine from the skulls of 11 narwhals and 26 belugas. In narwhals, dentine was sampled from tusk and embedded tooth; in belugas, dentine was sampled from tooth. δ13C and δ15N were measured, and intra-individual bone and dentine isotopic compositions were used to calculate correction factors for each species. We detected differences in δ13C and δ15N. In both narwhals and belugas, we found lower average δ13C and δ15N in bone compared with dentine. The correction factors provided by the study enable the combined analysis of stable isotope data from bone and dentine in these species.","PeriodicalId":14597,"journal":{"name":"Isotopes in Environmental and Health Studies","volume":"59 1","pages":"66-77"},"PeriodicalIF":1.3,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9152371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In situ assessment of terrestrial gamma radiation dose and associated radiological hazards in Katsina State, Nigeria. 尼日利亚卡齐纳州地面伽马辐射剂量和相关辐射危害的现场评估。

IF 1.3 4区环境科学与生态学

Isotopes in Environmental and Health Studies Pub Date : 2023-03-01 DOI: 10.1080/10256016.2023.2172001

Nuraddeen Nasiru Garba, Mukhtar Abdulkadir, Rabiu Nasiru, Muneer Aziz Saleh, Suleiman Bello, Mayeen Uddin Khandaker, Che Azurahanim Che Abdullah, Usman Musa Kankara

{"title":"In situ assessment of terrestrial gamma radiation dose and associated radiological hazards in Katsina State, Nigeria.","authors":"Nuraddeen Nasiru Garba, Mukhtar Abdulkadir, Rabiu Nasiru, Muneer Aziz Saleh, Suleiman Bello, Mayeen Uddin Khandaker, Che Azurahanim Che Abdullah, Usman Musa Kankara","doi":"10.1080/10256016.2023.2172001","DOIUrl":"https://doi.org/10.1080/10256016.2023.2172001","url":null,"abstract":"Terrestrial gamma radiation dose (TGRD) rates were measured in situ from different locations in Katsina State, Nigeria, using a portable radiation survey metre based on geological formations and soil types. The measured TGRD rates ranged from 45 to 271 nGyh-1 with an average value of 116 ± 1 nGyh-1. Geological formation (silicified sheared rock) and soil type (lithosols and ferruginous crusts and ferruginous tropical soils) appeared to have the highest mean TGRD values of 163 and 134 nGyh-1 with sandstone geological formation and alluvial and hydromorphic soils having the lowest TGRD with values of 80 and 61 nGyh-1, respectively. One way ANOVA results shows that the tested null hypothesis was rejected. Thus, indicating that there exists a strong relationship between the various geological formations, soil types with the measured TGRD values based on the alternate hypothesis. Human health hazard indices like annual effective dose equivalent (AEDE), lifetime outdoor annual equivalent dose, and relative excess lifetime outdoor cancer risk associated with the mean TGRD of the study area were also calculated and found to be 0.711, 9.955 mSv, and 5.79 × 10-4, respectively. These values were higher than the world average values but favourable compared with the safety limits recommended by ICRP.","PeriodicalId":14597,"journal":{"name":"Isotopes in Environmental and Health Studies","volume":"59 1","pages":"112-125"},"PeriodicalIF":1.3,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9161518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Nitrate isotopes reveal N-cycled waters in a spring-fed agricultural catchment. 硝酸盐同位素揭示了一个春季农业集水区的氮循环水。

IF 1.3 4区环境科学与生态学

Isotopes in Environmental and Health Studies Pub Date : 2023-03-01 DOI: 10.1080/10256016.2022.2157412

Ioannis Matiatos, Luis Araguás-Araguás, Leonard I Wassenaar, Lucilena Rebelo Monteiro, Astrid Harjung, Cedric Douence, Martin Kralik

{"title":"Nitrate isotopes reveal N-cycled waters in a spring-fed agricultural catchment.","authors":"Ioannis Matiatos, Luis Araguás-Araguás, Leonard I Wassenaar, Lucilena Rebelo Monteiro, Astrid Harjung, Cedric Douence, Martin Kralik","doi":"10.1080/10256016.2022.2157412","DOIUrl":"https://doi.org/10.1080/10256016.2022.2157412","url":null,"abstract":"Nitrate stable isotopes provide information about nitrate contamination and cycling by microbial processes. The Fischa-Dagnitz (Austria) spring and river system in the agricultural catchment of the Vienna basin shows minor annual variance in nitrate concentrations. We measured nitrate isotopes (δ15N, δ18O) in the source spring and river up to the confluence with the Danube River (2019-2020) with chemical and water isotopes to assess mixing and nitrate transformation processes. The Fischa-Dagnitz spring showed almost stable nitrate concentration (3.3 ± 1.0 mg/l as NO3--N) year-round but surprisingly variable δ15N, δ18O-NO3- values ranging from +5.5 to +11.1‰ and from +0.5 to +8.1‰, respectively. The higher nitrate isotope values in summer were attributed to release of older denitrified water from the spring whose isotope signal was dampened downstream by mixing. A mixing model suggested denitrified groundwater contributed > 50 % of spring discharge at baseflow conditions. The isotopic composition of NO3- in the gaining streams was partly controlled by nitrification during autumn and winter months and assimilation during the growing season resulting in low and high δ15N-NO3- values, respectively. NO3- isotope variation helped disentangle denitrified groundwater inputs and biochemical cycling processes despite minor variation of NO3- concentration.","PeriodicalId":14597,"journal":{"name":"Isotopes in Environmental and Health Studies","volume":"59 1","pages":"27-47"},"PeriodicalIF":1.3,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9506218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2