scholarly journals MODELADO DE METALES PESADOS EN EL FLUJO DE AGUA Y LODOS DEL ECOSISTEMA BENTÓNICO DEL RÍO BOGOTÁ – COLOMBIA

2021 ◽  
Vol 10 (2) ◽  
pp. 1-8
Author(s):  
Luis Felipe Pinzón Uribe
Keyword(s):  
Heavy Metals ◽  
Considerable Increase ◽  
Anthropogenic Activities ◽  
Environmental Problems ◽  
Water Bodies ◽  
Industrial Processes ◽  
Sampling Points ◽  
High Concentrations ◽  
Magdalena River ◽  
Del Rio

Industrial processes have created environmental problems because of the discharge of pollutants into the environment. Especially the water bodies have been contaminated by HM heavy metals. The Bogotá river has registered a considerable increase in these HM as it advances in its channel towards the Magdalena river without its effects on the benthic ecosystem have been established. The present study used the Bogotá river as a study source. This is born in the municipality of Villapinzón-Colombia and empties into the Magdalena River. The selected sampling points correspond to sectors where anthropogenic activities are carried out. The results showed the relation of its concentration for various metals, developing for each one the calibration curves in the water and the sediments. Although high concentrations were obtained in some sectors, they were within the parameters established by Colombian legislation.

Horizontal Mobility of Heavy Metals from Dumpsite in North Central States, Nigeria

2020 ◽  
Vol 15 (1) ◽  
pp. 8-14
Author(s):  
J.D. Bala ◽  
J.J. Musa ◽  
H.I. Mustapha ◽  
I.Y. Yerima ◽  
D.E. Sunday ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Anthropogenic Activities ◽  
Total Concentration ◽  
Natural Soil ◽  
Toxic Substances ◽  
Central State ◽  
Dump Site ◽  
North Central ◽  
Uppermost Layer ◽  
High Concentrations

Industrialization and population growth has lead to the introduction of toxic substances into the environment as waste from manufacturing  processes. This study describes the horizontal mobility of this waste containing heavy metals from dump sites to the surrounding environment of North Central state, Nigeria. Soil samples were collected within the dumpsites and the immediate surrounding soil at distance of 10m and 20m away to assess the migration and potential bioavailability of Cr, Fe, Mn, Pb, Zn, Cu and Al. Total concentration of the heavy metals and their fractionation were determined. The results indicate that heavy metals are more concentrated in the uppermost layer with significant migration down the slope, thereby posing a threat to groundwater quality. In the fractions, the concentrations of the metals follow this sequence: Mn>Fe>Cu>Zn>Cr>Al. The mobility factors of the heavy metals are significantly high indicating high potential mobility and bioavailable forms of these heavy metals. The high concentrations of the heavy metals particularly Cr, as observed in the study is as a result of anthropogenic activities on enrichment of natural soil with bioavailable heavy metals. Consequently, there is a need to be cautious in the way waste that is generated from heavy metals sources is added to natural soil. Key words: Dump site; Environment; Heavy metals; Soil; Waste

COMPARATIVE STUDY USING RAW AND TREATED CASSAVA AND LEMON RESIDUES IN THE REMOVAL OF NICKEL (II)

Agrociencia ◽  
2021 ◽  
Vol 55 (2) ◽  
pp. 145-158
Author(s):  
Candelaria Tejada Tovar ◽  
Diofanor Acevedo ◽  
Angel Villabona Ortíz ◽  
Nórida Pájaro Gómez ◽  
María Otero
Keyword(s):  
Heavy Metals ◽  
Citric Acid ◽  
Adsorption Capacity ◽  
Adsorption Process ◽  
Metal Removal ◽  
Anthropogenic Activities ◽  
Citrus Limon ◽  
Manihot Esculenta Crantz ◽  
High Concentrations ◽  
High Level

Increasing pollution of water bodies by heavy metals from different anthropogenic activities, mainly of industrial nature, generates a high level of danger due to accumulation. Within a given time, heavy metals reach high concentrations in living organisms, especially those around sites of discharge. The objective of this research was to evaluate the adsorption capacity of dried lemon (Citrus limon) and cassava (Manihot esculenta Crantz) peels, raw or treated with citric acid, to remove Ni (II) in synthetic aqueous solution with 100 mg L-1 of metal. To assess adaptation and characterize these bio-adsorbents, biomasses were washed with distilled water. They were dried at 90 °C for 24 h and then ground in a mill. The modification of the cassava and lemon peels was carried out with 0.6 M citric acid; followed by adsorption and kinetic tests that were carried out in a discontinuous system. The biomaterials were characterized by chemical, elemental and Fourier transform infrared spectroscopy (FTIR) analysis. We found that both biomasses are composed mostly of carbon and cellulose. The FTIR showed the presence of carboxyl, amino, carbonyl and hydroxyl functional groups, which intervene in the adsorption process. Lemon and cassava peels showed 95.8% adsorption capacity of Ni (II) ions, and 75.69% removal of the contaminants. The best adsorbent particle sizes were 0.5 mm for lemon, and 1 mm for cassava peel, the two biomasses at pH 6. The best fit of the experimental data was Freundlich’s model and the pseudo-second-order model best described adsorption kinetics in the Ni (II) removal process. Treatment of the biomasses with citric acid did not render a significant improvement in metal removal. The best conditions for an efficient adsorption process were achieved using a specific particle size for lemon, 0.5 mm, and 1 mm for cassava residues.

scholarly journals Assessment of groundwater pollution in relation to heavy metals of the alluvial aquifer of Thriasion Plain (NW Attica)

2017 ◽  
Vol 47 (2) ◽  
pp. 731 ◽  
Author(s):  
D. Kyriazis ◽  
E. Zagana ◽  
G. Stamatis ◽  
F. Fillippidis ◽  
E. Psomiadis
Keyword(s):  
Heavy Metals ◽  
Anthropogenic Activities ◽  
Karst Aquifer ◽  
Alluvial Aquifer ◽  
Human Consumption ◽  
Phreatic Aquifer ◽  
Aquifer Systems ◽  
High Concentrations ◽  
Carbonate Formations ◽  
High Degree

In this study the hydrogeological and hydrochemical characteristics of Thriasion Plain are presented focusing mainly on the presence of heavy metals in the alluvial aquifer. Two main aquifer systems exist in the study area: a) the karst aquifer hosted in the karstified carbonate formations, which structure the bedrock and the margins of the alluvial basin and b) the phreatic aquifer within the Quaternary deposits of the Thriasion Plain. Coastal and submarine groundwater discharges show the direct connection of the aquifers with the sea causing intense salinization in both aquifers. The phreatic aquifer is characterized by high levels of TDS (483 – 13,067 mg/l) and correspondingly high degree of hardness (15.7 to 165.7 odH). High concentrations of Na+, Cl-, SO4 2-, NO3 -, NH4 + and PO4 3- reflect the diverse anthropogenic influences on the aquifer. The strong presence of heavy metals, Cd, Cu, Fe, Mn, Ni, Pb, Sr and Zn has been determined in the most of the samples. Their origin is associated with geogenic factors, such as the occurrences of bauxites, oxides derived from the alteration of rocks, especially shischts, organic matter within the Plio-Pleistocene sediments of the region, as well as with intense pressures from anthropogenic activities. In some cases the groundwater is improper not only for human consumption but also for many other uses.

scholarly journals Comportamiento del hierro, cromo, cadmio y plomo total en las aguas superficiales del río Manzanares, Venezuela, durante los periodos de sequía y lluvia en el año 1994

2016 ◽  
Author(s):  
William James Senior ◽  
Ivan León Luna ◽  
Gregorio Martínez ◽  
Arístide Márquez ◽  
Ivis Fermín
Keyword(s):  
Heavy Metals ◽  
Anthropogenic Activities ◽  
Total Iron ◽  
Mixing Process ◽  
Geochemical Process ◽  
Removal Of Heavy Metals ◽  
Removal Processes ◽  
Cadmium And Lead ◽  
Del Rio ◽  
Iron Chromium

Results are presented for total iron, chromium, cadmium, and lead concentrations measured in the surface water of the Manzanares river (Venezuela), during two typical weather periods of the region (May and November) of 1994. The existence of removal processes in the early stages of the mixing process of freshwater and seawater is evident from their spatial distributions. It is suggested that this removal of heavy metals is associated with the geochemical process of flocculation and the formation of oxihydroxides, rather than with the dilution process. Input of heavy metals to the ecosystem was observed at low salinities that are likely associated to the process of desorption and are due to anthropogenic activities.

scholarly journals Presencia de metales pesados Cadmio y Plomo en el estuario del río Chone Manabí, Ecuador.// Presence of cadmium and lead heavy metals in the estuary of Chone River - Manabí, Ecuador

Ciencia Unemi ◽  
2017 ◽  
Vol 10 (24) ◽  
pp. 123
Author(s):  
Francisco Pozo Miranda
Keyword(s):  
Heavy Metals ◽  
Water Column ◽  
Water Samples ◽  
Sea Water ◽  
River Estuary ◽  
Soil Samples ◽  
Water Currents ◽  
High Concentrations ◽  
Cadmium And Lead ◽  
Del Rio

El presente estudio busca determinar la presencia de metales pesados, Cadmio y Plomo, en el estuario del Río Chone, Ecuador, durante Junio a Septiembre de 2014; se obtuvieron seis muestras de agua y cinco de suelo en seis sitios, con dos réplicas por sitios, dando el total de 66 muestras. El análisis se realizó según el protocolo del Kit para Cadmio y Plomo de Merck-Millipore. En el agua las concentraciones de Cadmio fueron mayores en el sitio P4 (0,129 mg/L). En el sedimento, el nivel de Cadmio en el sitio P2 presentó mayor acumulación (0,0033 mg/g), para Plomo, los sitios con mayor nivel fueron P5 y P6 (0,18 – 0,21 mg/L respectivamente), lugares con mayor flujo de agua del estuario del Río Chone (8 UPS: Unidades Prácticas de Salinidad) y menor influencia con las corrientes del agua del Mar (30 UPS). Los resultados comparados con la legislación Ecuatoriana evidencian concentraciones  altas de Cadmio en el ecosistema del estuario en estudio, que podría afectar la salud de organismos que viven a nivel de la columna de agua, tales como peces, al igual que actividades de recreación de los bañistas locales, de los cantones Sucre y San Vicente Manabí.ABSTRACTThe present study aims to determine the presence of cadmium and lead heavy metals in the Chone River estuary; Ecuador, during June to September 2014, six water samples and five soil samples were obtained at six sites, with two replications per site giving a total of 66 samples. The analysis was performed according to the protocol of Merck-Millipore Kit for cadmium and lead. Cadmium concentrations in the water were higher at the P4 site (0.129 mg/L). The level of cadmium in the sediment showed greater accumulation (0.0033 mg/g) in the P2 site. The sites with higher level of lead were P5 and P6 (0.18 y 0.21 mg/L respectively), these were places with greater flow of water of the Chone River estuary (8 UPS: Practical Units of Salinity) and less influence of the sea water currents (30 UPS).The results compared with Ecuadorian legislation show high concentrations of cadmium in the ecosystem of Chone River estuary, which could affect the health of organisms living at the water column level, such as fish, as well as recreational activities for local bathers from Sucre and San Vicente cantons from Manabí province.

scholarly journals Proximate Composition and Heavy Metal Analysis of Three Aquatic Foods in Makoko River, Lagos, Nigeria

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Isaac Opeyemi Ayanda ◽  
Gabriel Adewumi Dedeke ◽  
Ukinebo Imuentiyan Ekhator ◽  
Mary Kufreabasi Etiebet
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Proximate Composition ◽  
Anthropogenic Activities ◽  
Landing Site ◽  
Metal Analysis ◽  
Aquatic Products ◽  
Aquatic Food ◽  
High Concentrations ◽  
Not At Risk

Three aquatic products, tilapia fish, lobster and crab, were collected from the landing site of fishermen in Makoko, a fishing suburb in Lagos State, Nigeria. They were analyzed for their proximate composition, and concentration of heavy metals (Cr, Cd, and Pb) was also measured in them. The nutrient values varied among the three organisms. The lobsters and crabs had higher protein values while tilapia was richer in lipid and moisture content. In most cases, these differences were not significant. The concentration of heavy metals also differed in the three organisms. All organisms had high concentrations of the three heavy metals analyzed. The heavy metal load as observed in this study is consistent with some previously reported values in literature. Plausible reasons for these differences were discussed in light of size, trophic level, choice of food of the organisms, and anthropogenic activities. It may be advisable that heavy metal concentrations are regularly monitored in edible aquatic food products so that human health is not at risk.

scholarly journals The Geomicrobiology of Chromium (VI) Pollution: Microbial Diversity and its Bioremediation Potential

2016 ◽  
Vol 10 (1) ◽  
pp. 379-389 ◽  
Author(s):  
Huda Al-Battashi ◽  
Sanket J. Joshi ◽  
Bernhard Pracejus ◽  
Aliya Al-Ansari
Keyword(s):  
Heavy Metals ◽  
Anthropogenic Activities ◽  
Industrial Processes ◽  
Toxic Heavy Metals ◽  
Natural Processes ◽  
Chromium Vi ◽  
Microbial Utilization ◽  
Naturally Occurring ◽  
Current Review ◽  
Low Concentrations

The role and significance of microorganisms in environmental recycling activities marks geomicrobiology one of the essential branches within the environmental biotechnology field. Naturally occurring microbes also play geo-active roles in rocks, leading to biomineralization or biomobilization of minerals and metals. Heavy metals, such as chromium (Cr), are essential micronutrients at very low concentrations, but are very toxic at higher concentrations. Generally, heavy metals are leached to the environment through natural processes or anthropogenic activities such as industrial processes, leading to pollution with serious consequences. The presence of potentially toxic heavy metals, including Cr, in soils does not necessarily result in toxicity because not all forms of metals are toxic. Microbial interaction with Cr by different mechanisms leads to its oxidation or reduction, where its toxicity could be increased or decreased. Chromite contains both Cr(III) and Fe(II) and microbial utilization of Fe(II)- Fe(III) conversion or Cr (III) - Cr (VI) could lead to the break-down of this mineral. Therefore, the extraction of chromium from its mineral as Cr (III) form increases the possibility of its oxidation and conversion to the more toxic form (Cr (VI)), either biologically or geochemically. Cr (VI) is quite toxic to plants, animals and microbes, thus its levels in the environment need to be studied and controlled properly. Several bacterial and fungal isolates showed high tolerance and resistance to toxic Cr species and they also demonstrated transformation to less toxic form Cr (III), and precipitation. The current review highlights toxicity issues associated with Cr species and environmental friendly bioremediation mediated by microorganisms.

scholarly journals Variaciones de los niveles de mercurio y zinc en agua y sedimentos de la subcuenca del río Carrizal, Manabí

2019 ◽  
Vol 4 (1) ◽  
pp. 25
Author(s):  
Ana María Aveiga Ortiz ◽  
Patricio Noles ◽  
Patricio Noles ◽  
Julio Loureiro ◽  
Fabian Peñarrieta ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Environmental Pollution ◽  
Human Health ◽  
Aquatic Life ◽  
Natural Sources ◽  
Water And Sediment ◽  
Sampling Points ◽  
International Regulations ◽  
Index Terms ◽  
Del Rio

Excessive concentrations of mercury and zinc in natural sources are a risk to human health and to the development of adequate aquatic life. In the present study, the concentrations of Hg and Zn in samples of water and sediment from the Carrizal River (Cantón Bolívar, Manabí) were determined in two periods (August and October). In addition, 5 sampling points were characterized at La Esperanza reservoir, 7 at Carrizal river micro-basin, and 9 at the river sub-basin, covering an area of 51 km. The concentrations of Hg and Zn in the sediments were significantly higher than the concentrations obtained in the water. The contents of Hg in water and sediments of Carrizal River exceeded the safety limits established by national and international regulations; while the Zn concentrations obtained are considered to be a risk for aquatic life. Index Terms—bioaccumulation, adsorption, environmental pollution, heavy metals

Influence of Bacau City�s Antropic Activities on the Heavy Metals Concentration Measured on Bistrita and Siret River Sides

2020 ◽  
Vol 71 (1) ◽  
pp. 350-354
Author(s):  
Alexandra-Dana Chitimus ◽  
Florin-Marian Nedeff ◽  
Ion Sandu ◽  
Cristian Radu ◽  
Emilian Mosnegutu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Pollution Sources ◽  
Municipal Waste ◽  
Sampling Points ◽  
River Banks

The main objective of the current research is to determine the content of heavy metals from the Bistrita and Siret River banks, respectively Siret River � in Bridge Holt area, Siret River � canal UHE and Siret River- downstream confluence Bistrita/Siret. The choice of sampling points took into consideration the areas where the pollution sources are located. Established maximum values were not exceeded in the case of mercury in the soil for all three sampling points Siret River � in Bridge Holt area, Siret River � canal UHE and Siret River- downstream confluence Bistrita/Siret. Exceeding values recorded in the sampling points Siret River � in Bridge Holt area, Siret River � canal UHE and Siret River- downstream confluence Bistrita/Siret (for cadmium, nickel and chrome) resulted from discharged residual waters, industrial platforms form Bacau city and the improper storage of municipal waste.

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