Examinando por Materia "Heavy metals"

Mostrando 1 - 5 de 5

Bioaccumulation of heavy metals in high Andean crops of the Peruvian Andes: comparative evaluation between irrigated and dry systems
(Elsevier B.V., 2025-12-13) Ccopi Trucios, Dennis; Requena Rojas, Edilson Jimmy; Ortega Quispe, Kevin Abner; Solórzano Acosta, Richard Andi; Révolo Acevedo, Ronald; Pizarro Carcausto, Samuel Edwin
Heavy metal contamination in Andean agricultural systems is a growing concern for food safety and environmental health. This study assessed the concentrations and bioaccumulation patterns of eleven metals (Cd, Pb, As, Cr, Ni, Cu, Zn, Mn, Fe, Hg, Mo) in seven representative crops cultivated under irrigated and rainfed conditions in the Mantaro Valley, central Peruvian Andes. Soil and foliar samples were collected from paired plots, and bioaccumulation factors (BAF) were calculated to evaluate metal transfer to plant tissues. Irrigated soils showed higher and more homogeneous concentrations of Cd, Pb, and As, reflecting long-term accumulation from historical mining activities and irrigation with contaminated water from the Mantaro River. Foliar concentrations exceeded Codex Alimentarius limits for Cd, Pb, and As in several crops, especially potato and broad bean. BAF analyses revealed distinct crop-specific behaviors: potato, quinoa, and broad bean frequently exhibited BAF >1 for metals such as Cd, Cu, Zn, and Mn, indicating active uptake and translocation. In contrast, cereals such as maize and barley maintained low BAF values (<1), suggesting conservative absorption patterns. Irrigation increased the bioavailability of several metals, resulting in higher foliar concentrations and elevated BAF values compared to rainfed systems. Multivariate analyses further differentiated metal accumulation profiles by crop type and water management system. These findings highlight the need for strengthened monitoring of high-accumulation crops and improved soil and water quality management in historically contaminated Andean agricultural regions.
Determinación de plomo y cadmio en frutos de Mangifera indica L. (mango) cercanos a pozos de oxidación
(Universidad Nacional de Trujillo - Facultad de Ciencias Biológicas, 2026-01-29) Alarcon Cruz, Neidi; Peláez Gonzales, Romario Anibal; Chico Ruíz, Julio Roger; Campos Ruiz, Joseph; Campos Ruiz, Sanderson Narcizo; Calle Iparraguirre, Nander Oriol; García Carrasco, Elfer
Los metales pesados constituyen una de las principales fuentes de contaminación ambiental debido a su persistencia, bioacumulación y efectos adversos sobre los ecosistemas y la salud humana. El presente estudio tuvo como objetivo determinar las concentraciones de plomo (Pb) y cadmio (Cd) en frutos de Mangifera indica L. cultivados en áreas adyacentes a pozos de oxidación en el distrito y provincia de Jaén, Perú. La cuantificación de los metales se realizó mediante espectrofotometría de absorción atómica, siguiendo la normativa USEPA (1996) y el método 3052. Los resultados indicaron que el 33,3 % de las muestras superaron los límites máximos permisibles de Pb y el 3,33 % excedieron los valores establecidos para Cd, conforme al Codex Alimentarius, la Unión Europea y la legislación rusa. Asimismo, se observó mayor concentración de Pb en frutos de la parte inferior de la copa y de Cd en la zona media. En conclusión, los frutos evaluados no son aptos para consumo humano, representando un riesgo potencial para la salud pública.
Ecological and carcinogenic risk assessment of potentially toxic elements in rangelands and croplands around Lake Junin (Peru): Integrating remote sensing, machine learning, and land cover segmentation
(Elsevier, 2025-08-27) Pizarro Carcausto, Samuel Edwin; Requena Rojas, Edilson Jimmy; Barboza, Elgar; Peña Elme, Eunice Dorcas; Arias Arredondo, Alberto Gilmer; Ccopi Trucios, Dennis
The Junín Lake basin, a critical high-altitude ecosystem in the central Peruvian Andes, faces severe contamination from potentially toxic elements (PTEs) driven by mining activities, agriculture, and urbanization. This study evaluates the spatial distribution, ecological risk, and human health implications of 14 heavy metals, metalloids, and trace elements in surface soils surrounding the lake. Using 211 soil samples, we integrated remote sensing, land cover classification, and Random Forest machine learning models with spectral, edaphic, topographic, and proximity-based environmental covariates to predict contamination patterns and assess risk. Results reveal extreme contamination, with arsenic (As), lead (Pb), cadmium (Cd), and zinc (Zn) concentrations exceeding ecological thresholds by over 100-fold in agricultural zones. Ecological risk assessments using contamination degree (mCD), pollution load index (PLI), and risk index (RI) indicated that over 99 % of the study area exhibits very high to ultra-high contamination levels. Human health risk analysis identified unacceptable carcinogenic risks from As, Pb, and Cr across adult and pediatric populations, with arsenic presenting the greatest concern. The integration of geospatial tools and machine learning enabled precise identification of contamination hotspots and vulnerable land cover types, demonstrating the value of AI approaches for monitoring contaminated territories. These findings underscore the urgent need for coordinated environmental management, targeted remediation strategies, and community-based monitoring to protect public health and preserve Andean ecosystem integrity.
Geospatial distribution of cadmium in soil profiles of cacao (Theobroma cacao L.) plantations in the Peruvian Amazon basin
(Frontiers Media S.A., 2026-02-25) Vallejos Torres, Geomar; Chuchon Remon, Rodolfo Juan; Gaona Jimenez, Nery; Marín, César; Cruz Luis, Juancarlos Alejandro; Solórzano Acosta, Richard Andi
Introduction: Cacao plants can translocate heavy metals from the soil to vegetative tissues, potentially leading to concentrations that exceed maximum permissible limits. This study aimed to analyze the geospatial distribution of cadmium (Cd) in soil profiles of cacao (Theobroma cacao L.) plantations in the Amazon basin of Peru. Methods: The research was conducted in the localities of Jeberillos, Arahuante, and Luz del Oriente, within the department of Loreto. In each locality, 10 plots of 100 m² were selected, totaling 30 plots. Cd concentrations and physicochemical soil parameters were evaluated. Results: In cacao soils from Luz del Oriente at 0–30 cm depth, Cd concentrations averaged 1.11 ± 0.26 mg.kg⁻¹, representing the highest values; whereas the lowest average was recorded in Arahuante at the same depth, with 0.61 ± 0.15 mg.kg⁻¹. Cd levels in Luz del Oriente cacao soils (0–30 cm) were above the average among all localities, while Jeberillos and Arahuante soils showed comparatively lower Cd levels. Discussion: Overall, Cd in cacao soils was found to be strongly associated with edaphic factors such as pH, texture, effective cation exchange capacity (CEC), and cation composition. The maps represented the spatial distribution of the metal and guided the identification of potential accumulation zones. These findings provide essential insights for guiding agricultural management decision-making, environmental monitoring, and metal contamination risk assessment in cacao-growing areas and other agrarian systems in the Peruvian Amazon basin.
Potential of extremophilic and native microbial consortia in the bioleaching of heavy metals on mining process
(CRC Press, 2024-04-12) Hualpa Cutipa, Edwin; Solórzano Acosta, Richard Andi; Huayllacayan Mallqui, Jorge Johnny; Aguirre Catalan, Heidy Mishey; León Chacón, Andrea; Castro Tena, Lucero Katherine
Mining is a significant economic activity in many countries, resulting in the release of wastewater with high concentrations of heavy metals and other harmful compounds. Leaching is a treatment technique for these effluents, allowing the recovery of precious metals through solubilization, but it generates large amounts of tailings and waste effluents. Microbial leaching (bioleaching) is a biological strategy where microbes are used to solubilize precious metals in insoluble substrates through microbial metabolism or metabolic products. Extremophilic microorganisms, particularly those formed by indigenous consortia (bacteria and fungi), have versatile metabolic traits that are highly valued. Some heterotrophic bacteria adapt to acid environments and high concentrations of heavy metals as a defense mechanism against heavy metals. The pH is a fundamental parameter of bioleaching, and for efficient bioleaching, microbial consortia composed of mixed cultures, mainly extremophilic microbes, are proposed due to their poly-resistance to a reduced pH, likely to favor the recovery of metal. This chapter addresses the main characteristics of extremophilic microorganisms forming native microbial consortia and their biotechnological potential in the bioleaching of heavy metal-rich mining effluents. The aim is to highlight advanced strategies or methods for studying this group of microorganisms, considering their enormous potential as a priceless source of compounds of interest for various fields such as medicine, agriculture, and mining.