Identificación De Las Zonas Contaminadas Con Metales Pesados en El Polvo Urbano De La Ciudad De México

Delgado, Carmen; Bautista, Francisco; Gogichaishvili, A.; Cortés, José Luis; Quintana, P.; Aguilar, Daniel; Cejudo, Rubén

doi:10.20937/rica.2019.35.01.06

Cited by 19 publications

(20 citation statements)

References 23 publications

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“…The mean Pb concentration obtained in this survey well matches those from other previous investigations [4,15,20,25], and the one brought using ICP-OES on the same samples (Table 4). In all cases, the mean Pb concentrations obtained are significantly underneath the maximum permissible levels (400 mg/kg) for residential/commercial usage allowed, according to SEMARNAT [23].…”

Section: Discussionsupporting

confidence: 90%

“…7). While the high contamination Pb level for the central and northern zones could well be attributed to anthropic processes, the higher V concentration could be instead explained in terms of the geological characteristics and relief, as mentioned by Delgado-Carranza et al [4].…”

Section: Resultsmentioning

confidence: 92%

“…Besides air pollution, water pollution and soil pollution have been widely studied, and there are environmental standards for their regulation [3]. On the contrary, dust pollution studies are scarce and there are no official rules which regulate the presence of dust in the environment [4]. Although dust comes from both natural and anthropic sources, street dust (SD) is mainly composed of particles derived from anthropic processes [5].…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, Mexico City has 23 and a half million inhabitants, there are 40,000 small-and medium-sized industries of various types, and 9.5 million motor vehicles circulate [10]. Because of these facts, together with the geological and geographic characteristics, relief, drainage, and wind direction, Delgado-Carranza et al [4] considered that almost all of Mexico City is likely contaminated by heavy metals contained in the SD.…”

Section: Introductionmentioning

confidence: 99%

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Heavy metal content estimation in the Mexico City Street dust: an inter-method comparison and Pb levels assessment during the last decade

et al. 2020

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Elemental concentrations measured in 482 street dust samples from different urban and conurbated areas of Mexico City obtained using a portable energy-dispersive X-ray fluorescence spectrometer are reported. The data quality of eight different elements commonly used in pollution studies is evaluated, calculating the data precision and accuracy obtained with this handheld equipment. Precision for the various elements analyzed ranges between 1.2 and 15.9%, which can be considered as adequately precise for portable equipment. In the case of the accuracy, a maximum under-/overestimation of less than 20% was achieved. Pb and Zn correlation factors were 0.725 and 0.923, respectively. Similar mean Pb concentration values to those reported by ICP-OES were obtained. An average value of ~ 100 mg/kg for Pb concentration was estimated, which is significantly lower than the utmost permissible levels for residential/commercial usage. On the contrary, contamination factors calculated to identify the metal accumulation against those of the background values point from considerable to high contamination for 62 and 30% of the street dust samples analyzed, respectively. A comparison of the results recorded in Mexico City 10 years ago against those obtained suggests that no significant reduction in Pb concentration has occurred during this period despite the measures implemented to stop using leaded gasoline for three decades. Finally, the sample's low-amount requirements, simple nondestructive preparation procedure, and rapid elemental concentration determinations make portable XRF a promising geochemical determination technique for the fast and economic evaluation of contamination by heavy metals in large cities.

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Section: Discussionsupporting

confidence: 90%

Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Heavy metal content estimation in the Mexico City Street dust: an inter-method comparison and Pb levels assessment during the last decade

et al. 2020

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“…Furthermore, Tláhuac, Tlalpan, and Xochimilco in the south have the lowest concentrations of other potentially toxic elements also reported. 13,16 Azcapotzalco and Iztapalapa were the municipalities with greater Mn load (figure 4b).…”

Section: Figure 3 Spatial Distribution Of the Contamination Factor Amentioning

confidence: 94%

Spatial distribution of manganese concentration and load in street dust in Mexico City

et al. 2020

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Objective. To obtain a first indication of the distribution and extent of manganese (Mn) contamination in Mexico City. Mn concentration and load in street dust were analyzed in order to reveal the most contaminated areas. Materials and methods. 482 samples of street dust were analyzed through inductively coupled plasma-optical emission spectroscopy. The contamination factor (CF), the geoaccumulation index (Igeo) and the spatial interpolations of the kriging indicator were calculated. Results. A slight influence of anthropogenic activities is detected on the Mn content of street dust. The highest levels of pollution by concentration (Igeo=uncontaminated to moderately contaminated) are grouped towards the city’s north (industrial) and center (commercial and high traffic) areas. The areas with the highest Mn load were located towards the east and northwest areas (Igeo=moderately contaminated). Conclusions. These findings will serve as a baseline to assess future variations in Mn content in Mexico City’s environment.

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Heavy metal pollution of street dust in the largest city of Mexico, sources and health risk assessment

Aguilera

Bautista

Gutiérrez-Ruíz

et al. 2021

Environ Monit Assess

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In large industrialized cities, tons of particles containing heavy metals are released into the environment and accumulate on street surfaces. Such particles cause a potential risk to human health due to their composition and size. The heavy metal contamination levels, main emission sources, and human health risks were identified in 482 samples of street dust. Heavy metal concentrations were obtained by microwave-assisted acid digestion and ICP-OES. The results indicated that street dust in Mexico City is contaminated mainly with Pb, Zn, and Cu, according to the contamination factor and the geoaccumulation index. The pollution load index of the street dust was made with the concentrations of Pb, Zn, Cu, Cr, and Ni. The main sources of Pb, Zn, Cu, and Cr are anthropic, probably due to vehicular traffic. The highest levels of Cr and Pb in urban dust represent a health risk for children. Contamination limits were proposed for heavy metals in street dust of Mexico City. These limits might be useful to generate and apply public policies to decrease anthropic emissions of the heavy metals studied, particularly Cr and Pb.

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Identificación De Las Zonas Contaminadas Con Metales Pesados en El Polvo Urbano De La Ciudad De México

Cited by 19 publications

References 23 publications

Heavy metal content estimation in the Mexico City Street dust: an inter-method comparison and Pb levels assessment during the last decade

Heavy metal content estimation in the Mexico City Street dust: an inter-method comparison and Pb levels assessment during the last decade

Spatial distribution of manganese concentration and load in street dust in Mexico City

Heavy metal pollution of street dust in the largest city of Mexico, sources and health risk assessment

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