Application of Lead Isotopic Ratios in Atmospheric Pollution Studies in the Valley of Mexico

Martı́nez, T.; Lartigue, J.; Juarez, F.; Ávila-Pérez, Pedro; Zarazua, G.; Márquez, C.; Orta, M.; Múgica, V.

doi:10.1007/s10874-004-1256-1

Cited by 10 publications

(2 citation statements)

References 12 publications

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“…Besides, the EF crustal anthropogenic mobilization is also indicated by the Br : Cl ratio (0.65% by average), which exceeded the sea-salt Br : Cl ratio (0.34%). The Pb and non-sea-salt Br levels suggest that fuel additives, though insignificantly, still add to Pb and Br in air and the Pb levels at the site (Br : Pb ¼ 0.4-0.5 in vehicular traffic emissions; cf [26,27]) in agreement with a recent study in Mexico City [28]. The mobilization of As is usually mostly due to coal burning, which is probably not significant in the study area.…”

Section: Mass Concentrations and Influences Of Possible Sourcessupporting

confidence: 89%

Evolution of anthropogenic aerosols in the coastal town of Salina Cruz, Mexico: part III size-segregated elemental composition analysed by total-reflection X-ray fluorescence spectrometry

Lammel

Baumgardner

Fittschen

et al. 2007

International Journal of Environmental Analytical Chemistry

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Heavy metals in various size modes of the atmospheric aerosol are a concern for human health. Their and other elements' concentrations are indicative for anthropogenic and natural aerosol sources. Si, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Br, Rb, Sr, Hg, and Pb were determined as a complementary contribution to a study on aerosol cycling during the wet season, June 2004, in a humid, subtropical climate, i.e. in the city of Salina Cruz, situated on the Pacific coast of the Isthmus of Tehuantepec (16.2 N, 95.2 W), Mexico. For mass (gravimetry) and elemental analyses, particles were collected by a Berner low-pressure round nozzle cascade impactor using four stages corresponding to 0.1-0.25, 0.25-1.0, 1.0-4.0, and 4-16 mm of aerodynamic particle size. The impaction plates were modified such that approx. 1/6 consisted of a plastic support (Persplex Õ ) for total reflection X-ray fluorescence spectrometry (TXRF). The elements' total content was determined by TXRF without any further sample pretreatment. Limits of quantification (LOQ) for elemental content in individual impactor stages corresponded to 25-60 ng m À3 for Si; 0.8-4 ng m À3 for Cl, K, Ca, Ti, and V; 3-20 pg m À3 for Cr, Mn, Fe, Cu, Ni, and Zn; and 7-50 pg m À3 for As, Se, Br, Rb, Sr, Hg, and Pb. In some samples, however, high blank values for the supports gave an LOQ ¼ 6-19 ng m À3 for Cl; 3-7 ng m À3 for Ca; 3-7 ng m À3 for Fe, Ni, Cu, and Zn; and 60-70 ng m À3 for Pb. The influence of local natural, industrial, and vehicle traffic sources for heavy-metal mobilization was obvious. Heavy-metal abundances did not coincide with regionally distributed pollutants. V and Ni were found at particularly elevated levels advected with the sea breeze, which points to ships as sources. Br and Pb were found at particularly low levels. The concentrations of Br, Rb, Sr, and Pb were found below LOQ at least in some, As, Co, Se, and Hg in all of the samples. The elements' characteristic differences in mass size distributions were obvious despite the coarse size resolution. During the cycling of air masses from land to sea and back again, enrichment of super-micrometre particles in the near ground aerosol was observed under dry weather conditions. Rain preferentially removed the large particles with which heavy metals have been associated. *Corresponding

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Section: Mass Concentrations and Influences Of Possible Sourcessupporting

confidence: 89%

Evolution of anthropogenic aerosols in the coastal town of Salina Cruz, Mexico: part III size-segregated elemental composition analysed by total-reflection X-ray fluorescence spectrometry

Lammel

Baumgardner

Fittschen

et al. 2007

International Journal of Environmental Analytical Chemistry

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“…Besides cuprousferrite and cupricferrite described above, goethite [α-FeO(OH) Pb/ 204 Pb plots of AMD and tributaries of the Xochula stream in the mining region of Taxco, Guerrero, México. Available Pb isotopic data of the rocks from the zone after Talavera et al (2016) and Vázquez-Bahena et al (2017) as well as of Mexican gasolines after Martínez et al (2004) and Morton-Bermea et al (2011) are also plotted for comparison. The dashed field indicates the range of Pb isotopic composition of the Taxco ore deposits after data of Cummings (1979) and Vázquez-Bahena et al (2017).…”

Section: Speciation and Saturation Indexesmentioning

confidence: 99%

Temporal and spatial hydrogeochemical evolution and lead isotopic composition of a contaminated stream of Taxco, Guerrero, Mexico

et al. 2020

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Discharge of Acid Mine Drainage (AMD) produced within flooded mines is a major environmental issue in most polymetallic mining sites severely impacting nearby natural resources and producing a serious menace to the ecosystem and humans. The identification of both natural and anthropological factors influencing the bioavailability of toxic elements is relevant in revealing their behavior but also in the design of strategies for mitigating adverse effects to the environment. For these purposes, we carried out a spatial and seasonal hydrogeochemical (total and soluble contents) and a lead isotopic study of the AMD of the Xochula stream in the mining region of Taxco, Guerrero, in southern Mexico. The AMD is produced by the periodic discharge from the flooded Guerrero mine to the Xochula stream and is characterized by low to moderate pH, high sulfate, and high total and soluble metal contents. The AMD shows significant spatial but smaller temporal variations. Flow of AMD through a culvert made of concrete produces the most important chemical changes recorded regardless of the time of year significantly decreasing the electrical conductance and the concentration of total and soluble potentially toxic elements. Distribution of metals and As between dissolved and particulate-bound species is pH-controlled. Due to the short interaction time between the AMD and bedrock and the formation of coatings, lithology plays a minor role in neutralization, whereas mixing of AMD with freshwater is only significant in the less acidic segment of the stream. Neutralization of AMD entails a significant decrease of the concentration of both total and soluble metals and As and chemical speciation indicates that oxides, carbonates and sulfates are the reactive phases. The Pb isotopic composition reveals that metals derive from the Taxco ore deposit and that AMD is influenced by rocks of the Morelos and Taxco Schist formations.

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Characterization of particulate matter from the Metropolitan Zone of the Valley of Mexico by scanning electron microscopy and energy dispersive X-ray analysis

Martı́nez¹,

Lartigue²,

Ávila-Pérez

et al. 2008

J Radioanal Nucl Chem

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Application of Lead Isotopic Ratios in Atmospheric Pollution Studies in the Valley of Mexico

Cited by 10 publications

References 12 publications

Evolution of anthropogenic aerosols in the coastal town of Salina Cruz, Mexico: part III size-segregated elemental composition analysed by total-reflection X-ray fluorescence spectrometry

Evolution of anthropogenic aerosols in the coastal town of Salina Cruz, Mexico: part III size-segregated elemental composition analysed by total-reflection X-ray fluorescence spectrometry

Temporal and spatial hydrogeochemical evolution and lead isotopic composition of a contaminated stream of Taxco, Guerrero, Mexico

Characterization of particulate matter from the Metropolitan Zone of the Valley of Mexico by scanning electron microscopy and energy dispersive X-ray analysis

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