Abrahan Mora

TL;DR: This study aimed to track different sources and transformation processes of nitrate and sulfate pollution in Monterrey using a suite of chemical and isotopic tracers combined with a probability isotope mixing model and found soil nitrogen and sewage were found to be the most important nitrate sources.

TL;DR: The presence of these PhACs, together with the high levels of the endocrine disruptor bis-2-(ethylhexyl) phthalate, indicate that water sources derived from the recharge of the studied aquifers may pose a risk to consumer health.

TL;DR: The results of the MixSIAR isotope mixing model revealed that the application of manure from concentrated animal-feeding operations and urban sewage were the primary contributors of NO3- pollution, whereas synthetic fertilizers, soil organic nitrogen, and atmospheric deposition played a less important role.

TL;DR: The Monterrey metropolitan area (MMA) is the third greatest urban area and the second largest economic city of Mexico and groundwater supplied to MMA showed a high-quality, high mineralized waters of group 5 have NO3− concentrations higher than the maximum value proposed by international guidelines and SO42−,NO3−, and total dissolved solid concentrations higherthan the maximum levels allowed by the Mexican normative.

TL;DR: In this article, an approach combining hydrochemical tools, multi-isotopes (δ2HH2O, δ18OH2O), δ15NNO3 and δ34SSO4, and a Bayesian isotope mixing model was used to estimate the contribution of different sources to groundwater.