Assessment of the concentrations of U and Th in PM2.5 from Mexico City and their potential human health risk

Méndez-García, C.; Romero-Guzmán, Elizabeth Teresita; Hernández‐Mendoza, Héctor; Solís-Rosales, Corina; Chávez-Lomelí, E.

doi:10.1007/s10967-017-5549-7

Cited by 8 publications

(2 citation statements)

References 31 publications

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“…Finally, S and Fe had similar values in both studies.A simple way to recognize geogenic provenance of the elements is the use of enrichment factors (EF), taking as a reference a crustal element(Lawson and Winchester 1967). The EF compares the relative concentration of an element in the airborne particles to that in crustal material and it has been used to evaluate whether its presence in PM is due to crustal or non-crustal sources(Méndez-García et al 2017, Rodriguez-Espinosa et al 2017, Shruti et al 2018. Values of EF close to 1 suggest the element in the PM may have a significant fraction contributed by a crustal source.…”

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confidence: 99%

A Study of PM2.5 Elemental Composition in Southwest Mexico City and Development of Receptor Models With Positive Matrix Factorization

Hernández-López

Miranda

Múgica-Álvarez

et al. 2020

RICA

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A study of elemental composition of PM2.5 samples collected at the main campus of the Universidad Nacional Autónoma de México, comprising data from 2015, 2016, and 2019, is described. X-ray fluorescence analysis was employed to measure concentrations of up to 19 elements, complemented with ion chromatography for eight ionic species (for samples of 2015 and 2016), and thermo-optical analysis for organic and elemental carbon (for samples of 2015). Positive matrix factorization (PMF) was applied to develop receptor models for each year, to identify polluting sources and their contributions to total mass. Five sources were identified in every case. With the aid of PMF, the influence of biomass burning on a major episode in May, 2019, was recognized. Comparisons with previous studies in this or nearby sites are also presented. It should be noted that only limited compositional data in this site are available since 2005 for the aerosol fine fraction.

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confidence: 99%

A Study of PM2.5 Elemental Composition in Southwest Mexico City and Development of Receptor Models With Positive Matrix Factorization

Hernández-López

Miranda

Múgica-Álvarez

et al. 2020

RICA

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“…Since its inauguration in 2013 a prolific production has been achieved through the precise measurement of the ultra low concentration of naturally occurring radioisotopes in matter ( 10 Be, 14 C and 26 Al). Thousands of samples have been analyzed, some of the more relevant results in applied and interdisciplinary research produced in this facility can be found in [6,7,8,9,10,11,12]. This facility has also been useful for fundamental nuclear physics research [13,14,15,16,17].…”

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Monoisotopic targets production from atomic and molecular positive ion implantation in a tandem accelerator at low energies

Mas-Ruiz,

Marín-Lámbarri,

Sandoval-Hipólito

et al. 2023

J. Phys.: Conf. Ser.

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We produced monoisotopic targets of 13C and 28,29Si with 1015−16 atoms/cm2 areal density by ion implantation in different matrices at the Accelerator Mass Spectrometry (AMS) facility in Mexico. The tandem accelerator terminal voltage was set at the lowest achievable value (200 kV) that yield beams with energy of 435 keV. It is possible to do ion implantation at lower energies in our facility through the use of molecular beams, so in this work we looked for, and successfully found, bound positively charged molecular beams, although with very low intensity. We inject 235 keV C 6 − molecules into the charge of exchange canal (argon) of our tandem accelerator and detected the survival fraction of C2,3,4 molecules in 1+ and 2+ charge states or above. Our results showed that some molecules remain bound, with one or more electrons missing, after being forced through a low density gas stripper at relatively high energy. In the production process of negative molecular fluxes in the Source of Negative Ions by Cesium Sputtering (SNICS) we found an odd-even effect in their intensity that we understand as the coupling between the fragment size distribution of a dynamic fragmentation of graphite by cesium impact and the electron affinity of the molecules with n-carbon atoms. The availability of these kind of high energy molecular beams opens the door for discovery both in the study of the physics of negative and positive molecular ions.

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14C/12C isotopic ratio of a research nuclear reactor graphite control bar

Belmont

Marín-Lámbarri

Cruz-Galindo

et al. 2020

Nuclear Instruments and Methods in Physics Research Section B:

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Assessment of the concentrations of U and Th in PM2.5 from Mexico City and their potential human health risk

Cited by 8 publications

References 31 publications

A Study of PM2.5 Elemental Composition in Southwest Mexico City and Development of Receptor Models With Positive Matrix Factorization

A Study of PM2.5 Elemental Composition in Southwest Mexico City and Development of Receptor Models With Positive Matrix Factorization

Monoisotopic targets production from atomic and molecular positive ion implantation in a tandem accelerator at low energies

14C/12C isotopic ratio of a research nuclear reactor graphite control bar

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