The design of proxy techniques is an innovative tool to monitor the potentially toxic elements of pollution in road dust. This study evaluated the use of road dust color as a proxy methodology to identify samples contaminated with presumably contaminating elements. FRX determined the concentrations of Fe, Ti, Rb, Sr, Y, Cu, Zn, and Pb in eighty-five road dust samples. The appliance of the RGB system and the Munsell color cards identified five color groups of road dust samples. The discriminant analysis validated these groups by colorimetric indices and presumably contaminating elements. The “very dark gray” color of road dust contains the highest concentrations of Pb, Cu, Zn, and Y. The redness and saturation rates showed high correlations with presumably contaminating elements in “dark gray” and “very dark gray” color samples. The color of road dust, as a proxy technique, allows identifying samples contaminated with presumably contaminating elements.

https://www.mdpi.com/2073-4433/12/4/483/pdf

Color as a New Proxy Technique for the Identification of Road Dust Samples Contaminated with Potentially Toxic Elements: The Case of Mérida, Yucatán, México

Tomo 44 • N° 2 • 2012 1 Profesor-investigador. Facultad de Agronomia. Universidad Autonoma de San Luis Potosi. Km 14,5 Carretera San Luis-Matehuala. Apartado Postal 32. C. P. 78321 Soledad de Graciano Sanchez, San Luis Potosi. Mexico. jorge.alcala@uaslp.mx 2 Egresada de Programa Ingeniero Agroecologo. Facultad de Agronomia. Universidad Autonoma de San Luis Potosi. Mexico. 3 Profesor-investigador. Dpto. de Agronomia. Universidad Autonoma de Baja California Sur. Carretera al Sur km 5,5. Apartado Postal 19-B. C. P. 23080 La Paz, Baja California Sur. Mexico. 4 Profesor-investigador. Division de Estudios de Posgrado. Facultad de Agronomia. Universidad Autonoma de Nuevo Leon. Av. Universidad s/n. Ciudad Universitaria. San Nicolas de los Garza. Nuevo Leon. Mexico. Originales: Recepcion: 23/05/2011 Aceptacion: 14/06/2012 Metales pesados como indicador de impacto de un sistema ecologico fragmentado por usos de suelo, San Luis Potosi, Mexico

Heavy metals as an indicator of ecological impact of a fragmented land uses, San Luis Potosi, Mexico

Una estrategia para evaluar suelos es mediante índices de calidad que dependen de indicadores específicos sobre los suelos muestreados, el tipo de cultivo y el manejo realizado. Los indicadores son variables físicas, químicas o biológicas medibles, que afectan la capacidad del suelo al ejercer una o varias de sus funciones. El objetivo de esta investigación fue examinar el uso metodológico de las diferentes propiedades físicas, químicas y biológicas del suelo usadas como indicadores de calidad para determinar índices de calidad del suelo en México, a través de una revisión bibliográfica realizada en el año 2022, para el período 2000-2021 mediante diversos buscadores de artículos científicos y palabras clave relacionadas al tema, con la finalidad de generar un diagnóstico y vislumbrar oportunidades de investigación. Se debe prestar mayor atención al estudio de la calidad de suelos en México, con base en información técnica y científica en regiones y estados dónde esta información siga siendo escasa. Producto de la revisión bibliográfica se propone como un conjunto de indicadores físicos: a la textura, densidad aparente, estabilidad de agregados, infiltración, resistencia a la penetración, curva de retención de humedad y profundidad del suelo; como indicadores químicos: materia orgánica, pH, nitrógeno total, nitrógeno inorgánico, fósforo, potasio, calcio y magnesio y como indicadores biológicos: carbono en la biomasa microbiana, respiración del suelo, densidad de lombrices, deshidrogenasa, β-glucosidasa, ureasa, fosfatasa y a los hongos micorrízicos arbusculares, optando por un subconjunto de indicadores o por un conjunto mínimo de datos para conformar un índice de calidad de suelo. 

Análisis de indicadores e índices de calidad de suelos en México

An abandoned sphalerite mining area in the southwest (SW) of the Iberian Peninsula was studied to evaluate the impact that the presence of metal(loid)s has on soil and ecosystem health. Five zones were delimited: sludge, dump, scrubland, riparian zone, and dehesa. Critical total levels of lead (Pb), zinc (Zn), thallium (Tl), and chromium (Cr), well above the limit indicative of toxicity problems, were found in the areas close to the sources of contamination. Pb-Zn concentrations were very high in the riparian zone, reaching values of 5875 mg/kg Pb and 4570 mg/kg Zn. The whole area is classifiable as extremely contaminated with Tl, with concentrations above 370 mg/kg in the scrubland. Cr accumulation mainly occurred in areas away from the dump, with levels up to 240 mg/kg in the dehesa. In the study area, several plants were found growing luxuriantly despite the contamination. The measured metal(loid)s content is the cause of a significant decrease in ecosystem services, resulting in unsafe soils for food and water production, so the implementation of a decontamination program is advisable. The plant species Retama sphaerocarpa, present in the sludge, scrubland, riparian zone, and dehesa, is postulated as suitable for use in phytoremediation.

https://www.mdpi.com/2305-6304/11/3/275/pdf?version=1679052155

Status of Ecosystem Services in Abandoned Mining Areas in the Iberian Peninsula: Management Proposal

Environmental pollution by mercury and trace metals in highly vulnerable afro-descendant territories in the Department of Cauca, Colombia

Resumen es: El crecimiento de las ciudades ejerce presion sobre el conocimiento de la calidad del suelo y su asociacion como factor de contaminacion, debido a que su...

Metales pesados en suelo urbano como un indicador de la calidad ambiental: Ciudad de Chihuahua, México

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Metales pesados en suelo urbano como un indicador de la calidad ambiental: Ciudad de Chihuahua, México