EMMTE: An Excel VBA tool for source apportionment of nitrate based on the stable isotope mixing model

Cao, Xu; He, Wei; Shi, Yuanyuan; An, Tongyan; Wang, Rongping; Liu, Fei; Zhao, Yi; Zhou, Pengpeng; He, Jingwen

doi:10.1016/j.scitotenv.2023.161728

Cited by 7 publications

(2 citation statements)

References 43 publications

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“…This study employed the EMMTE model to ascertain the relative contributions of NO 3 -from various sources. EMMTE is an end-member mixing model tool developed in Excel™ 25 . The basic principle can be expressed as follows: Scatter plots of the NO 3 -/Clratio and Clmillimolar concentration.…”

Section: Emmte Modelmentioning

confidence: 99%

“…In contrast, the self-organizing map (SOM), an unsupervised neural network model, effectively maps complex nonlinear data into two dimensions, enabling systematic analysis and revealing local intervariable relationships 24 . Moreover, EMMTE, a new tool for stable isotope analysis of nitrate sources, outperforms conventional MixSIAR, offering higher prediction accuracy, lower root mean square error (RMSE), and reduced relative bias 25 . Combining EMMTEs with SOM facilitates the shift from qualitative to quantitative analysis, enhancing the understanding and interpretation of groundwater nitrate sources and transformation processes.…”

Section: Introductionmentioning

confidence: 99%

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Tracing groundwater nitrate sources in an intensive agricultural region: Integration of self-organizing map (SOM) and end-member mixing model tool (EMMTE)

Gao,

Wang,

Fan

et al. 2024

Preprint

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The traceability of groundwater nitrate pollution is crucial for controlling and managing polluted groundwater. This study integrates hydrochemistry, nitrate isotope (δ15N-NO3- and δ18O-NO3-), self-organizing map (SOM), and EMMTE models to identify the sources and quantify the contributions of nitrate pollution to groundwater in an intensive agricultural region. The results indicate that the NO3--N concentration in 74% of the groundwater samples exceeded the WHO standard of 10 mg/L. According to the results of EMMTE modeling, soil nitrogen (68.4%) was the main source of nitrate in Cluster-1, followed by manure and sewage (16.5%), chemical fertilizer (11.9%) and atmospheric deposition (3.3%). In Cluster-2, soil nitrogen (60.1%) was the main source of nitrate, with a significant increase in the contribution of manure and sewage (35.5%). The considerable contributions of soil nitrogen may be attributed to the high nitrogen fertilizer usage that accumulated in the soil in this traditional agricultural area. Moreover, it is apparent that most Cluster-2 sampling sites with high contributions of manure and sewage are located around residential land. Therefore, the arbitrary discharge and leaching of domestic sewage may be responsible for these results. This results provide useful assistance for the continuous management and pollution control of groundwater in this area.

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Section: Emmte Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%