Resumen en: The aim of this study was a survey of the estimated costs of soil erosion, an issue of fundamental importance in view of the current worldwide discussion...

http://www.redalyc.org/pdf/1802/Resumenes/Abstract_180218547001_2.pdf

Revista Brasileira de Ciência do Solo

Contamination, sources and health risk of heavy metals in soil and dust from different functional areas in an industrial city of Panzhihua City, Southwest China

Because of their importance as indicators of petroleum deposits, the benthic foraminifera of the Gulf of Mexico are one of the most intensely studied groups of animals in the world. This is especially true of the foraminifera inhabiting the shallow shelf region of the northern and eastern Gulf; much less is known about the animals of the southern shelf, continental slope, and abyssal plains. The author spent 10 years examining collections from various not well-known areas of the Gulf; this atlas is a synthesis of distributional data from approximately 4500 previously known stations, plus new information from 400 additional stations.

Ecologic Atlas of Benthic Foraminifera of the Gulf of Mexico

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.

/pdf/heavy-metal-pollution-of-street-dust-in-the-largest-city-of-348z83v4gz.pdf

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

Cozumel: Late Maya Settlement Patterns

La Quemada: Decline and abandonment in two stages on the classic period northern frontier of Mesoamerica

Environmental pollution is a negative externality of urbanization and is of great concern due to the fact that it poses serious problems to human health. Pollutants, such as heavy metals, have been found in urban road dust; however, it is unclear whether the urban form has a role in its accumulation, mainly in cases where there is no dominant unique source. We collected 482 samples of road dust, we determined the concentrations of five heavy metals (Cr, Cu, Pb, Zn, and Ni) using inductively coupled plasma optical emission spectrometry (ICP-OES), and then we derived the pollution load index (PLI). After estimating the mostly anthropogenic origin of these pollutants based on global levels of reference, there were two main aims of this study. Firstly, to analyze the spatial correlation of heavy metals, and secondly, to identify the main factors that influenced the heavy metal concentrations in the road dust of Mexico City. We did this by using a spatial autocorrelation indicator (Global Moran’s I) and applying ordinary least squares (OLS) and spatial regression models. The results indicated low levels of positive spatial autocorrelation for all heavy metals. Most variables failed to detect any relationship with heavy metals. The median strip area in the roads had a weak (significance level of 90%) but consistent positive relationship with Cr, Cu, Ni, Pb, and the PLI. The distance to the airport had a weak (significance level of 90%) and inverse relationship with Pb. Manufacturing units were associated with an increase in Cu (significance level of 95%), while the entropy index was associated with an increase in Ni (significance level of 95%).

Is the Urban Form a Driver of Heavy Metal Pollution in Road Dust? Evidence from Mexico City

Siete millones de personas mueren al ano por cancer relacionado con la contaminacion ambiental. El polvo urbano (PU) contiene particulas < 10 µm que afectan la salud humana. En la Ciudad de Mexico (CDMX) existe solo un estudio de PU. El objetivo de este estudio fue identificar las zonas de la CDMX con mayor probabilidad de contaminacion por metales pesados (MP) en el PU. Se recolectaron 89 muestras de PU y se midio la concentracion de MP por fluorescencia de rayos X. El analisis espacial se realizo mediante interpolacion con kriging indicador. El porcentaje de la superficie con mayor probabilidad de que los MP superen los limites maximos permitidos (LMP) fueron: Cr (LMP 280 mg/kg), 0.55 %, suroeste; Cr (LMP 64 mg/kg), 89 %, toda la CDMX y la mayoria de las areas conurbadas (AC); Cu, 17 %, 11 delegaciones y AC del norte; Ni, 13 %, centro y suroeste; Pb (LMP 140 mg/kg), 17.5 %, delegaciones centricas y AC del noroeste; Pb (LMP 400 mg/kg), 2.2 %, delegaciones centricas y AC del noroeste; V, 26 %, delegaciones centricas y del sur, asi como AC del noreste; Zn, 21 %, delegaciones centricas y AC del norte. Los elementos con mayor numero de sitios y superficie contaminada son: Cr, Zn, Cu y Pb. Los sitios con mayor superficie de sobreposicion de MP son aquellos con asociaciones entre Cu y Zn (15 %), y Cu y Pb (13 %). Las delegaciones Cuauhtemoc, Venustiano Carranza y Gustavo A. Madero son las mas contaminadas con metales pesados.

/pdf/identificacion-de-las-zonas-contaminadas-con-metales-pesados-4dxdsladpq.pdf

Rubén Cejudo

Papers

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

La Quemada: Decline and abandonment in two stages on the classic period northern frontier of Mesoamerica

Is the Urban Form a Driver of Heavy Metal Pollution in Road Dust? Evidence from Mexico City

Identificación de las zonas contaminadas con metales pesados en el polvo urbano de la ciudad de méxico

Sedimentary and microfossil imprint from historical earthquakes and tsunamis, Jalisco coast, Mexican subduction