Potential toxic metals concentrations in different aquatic. Concentration and human health implications of trace metals. Eight heavy metals such as fe, pb, cu, ni, co, zn, mn and cd were analyzed. Heavy metal content in samples was determined using flame atomic absorption spectrophotometry faas.
Heavy metals pollution index of surface water from commodore. The study investigated the level of heavy metals in surface waters and sediments in the lagos lagoon, lagos state. The study of heavy metals and microbial contamination of tilapia specie in lagos lagoon revealed a higher value in the whole body as well as different parts of the fish than the water samples 11,16,17. Water samples in lagos metropolis using anodic stripping voltammetry ehieromosele c. In the lagos lagoon, metals are reported to be well. Epe lagoon is connected to the lagos lagoon to the west and the lekki lagoon to the east. Lagos harbour is a section of the lagos lagoon system which is directly associated with the atlantic ocean and routinely dredged to enhance vessel capacity of ports in lagos. Trend of heavy metal concentration in lagos lagoon. Living organisms require trace amount of heavy metals but excess of it could result in serious damages to such organism. Seasonal variation in the bioaccumulation of heavy metals in. Concentrations of cadmium, cobalt, copper, chromium, iron, manganese, nickel, lead and zinc were determined in surface sediments of the lagos lagoon. Determination of heavy metal in water and sediment of dez.
Pdf lagos lagoon, covering 700 km, is a brackish coastal lagoon, on the western part of nigeria 626 2 37n. Levels of cadmium, cobalt, copper, chromium, iron, manganese, nickel, lead and zinc were determined in the water and in some fish and shellfish in the lagos lagoon. The concentration of heavy metals as reported in this study further supports earlier claims that the ogun river is polluted by toxic heavy metals like pb, cd and ni. The study was aimed at assessing its suitability for fish production and as well as its safety for drinking purpose in man. Lagos island lagoon on the other hand is also located in lagos state. Earlier studies have shown that sediments have higher levels of heavy metals than the water which shows that heavy sediments act as a sink for heavy metals 20,21. Cored soft sediments were retrieved from six random sampling points within the lagoon and labeled s1, s2, s3, s4, s5 and s6. The geoaccumulation of cd in sediments of the lagoon was found to be very high as shown by results of analysis of the index. Sediments from ologe lagoon, agbara, lagos, nigeria. In the lagos lagoon, metals are reported to be well concentrated in the water, sediments and biota donpedro et al. Pdf seasonal variation of heavy metals in sediment and. Ajao 1990 reported that a visible effect of these heavy metals is presented in fish caught, which are falling.
The levels of heavy metal contamination in soils can be evaluated by the geoaccumulation index gi. Geoenvironmental implications of heavy metals distribution in. Assessment of heavy metal contamination on dumpsite in. As such, heavy metal is a major pollutant in river because in large enough doses, it can prove lethal to organisms including humans inyinbor et al. Heavy metal bioaccumulation and biomarkers of oxidative stress in the wild african tiger frog, hoplobatrachus occipitalis. The lagos lagoon is vastly impacted by numerous wastes that posed a stern threat to the communities that largely depends on it for the source of income, especially the masses living along the waters edge. Heavy metal pollution in lake mariut has been further investigated by elrayis and saad 1990, based on the distribution of cu, zn, fe and mn in water, suspended matter and sediments. Trend of heavy metal concentration in lagos lagoon ecosystem.
Physicochemical parameters and heavy metal contents of water. Water and sediment samples were collected in sterile plastic containers respectively from 8 sampling locations inclusive of a control. Assessment of heavy metals pollution in sediments from ologe. A study of the sediments and communities in lagos lagoon. Heavy metals concentration in lagos lagoon, nigeria. It is shallow, open and experiences environmental gradients linked to rainfall patterns nwankwo et al. Lagos lagoon cuts across the southern part of the metropolis, linking the atlantic ocean in the south and lekki lagoon in the east fig. Heavy metal assessment of ground, surface and tap water.
More studies in the distribution of heavy metals in water bodies reveal that the levels of. The compartments water and sediments, as well as selected biota of inland water bodies and coastal marine areas, have been investigated. Assessment of potential ecological disruption based on heavy. Some of these resources are tin, iron ore, coal, lead, zinc, limestone, niobium izah and srivastav, 2015.
Assessment of heavy metals pollution in sediments from. Request pdf on sep 2, 2009, kn donpedro and others published trend of heavy metal concentration in lagos lagoon ecosystem, nigeria find, read and. A total of 228 bacteria with an ability to resist toxic heavy metals were isolated from 8 selected sites of the lagos lagoon. Lagos harbour is a section of the lagos lagoon system which is directly. Isolation and characterization of heavy metals resistant. Review of heavy metals food and agriculture organization. The results revealed largely anthropogenic heavy metal enrichment and implicated urban and industrial wastes and runoff water transporting metals from land. Pdf studies on the occurrence and distribution of heavy. Pdf determination of heavy metals in fish tissues, water. Hydrochemistry and levels of some heavy metals in samples of ibeshe, lagos lagoon complex, nigeria. Since parasites are in direct contact with the contaminants in the environment, they may be easily susceptible to heavy metals accumulation 4. Seasonal variation of heavy metals in sediment and water. Southern, central and northeastern segments of lagos lagoon were analysed for levels of selected heavy metals i.
For this assessment, crabs were sampled from makoko and ibese which receives domestic waste and textiles effluents respectively and ajah as control site, from february 2010 to august, 2011 in order to evaluate the. Analytical investigation of pollutants in lagos coastal waters, nigeria however, the conductivity 25,000ohm and total harness mgl were high for all the sampling points. Determination of heavy metals in fish tissues, water and sediment from epe and badagry lagoons, lagos, nigeria article pdf available in ejournal of chemistry 71 january 2010 with 3,379 reads. Bioaccumulation heavy metals lagos lagoon gill bone flesh introduction bioconcentration is the net accumulation of a the accumulation of toxic metals to hazardous levels from the simultaneous uptake and elimination of the in aquatic biota has become a problem of increasing pollutant 9. Therefore, the objective of this study was to determine the concentrations of some heavy metal ions in lagos lagoon. The determination of the metal concentrations in the water column and sediment of the lagos lagoon revealed that these media of the lagoon contained measurable concentrations of heavy metals but the levels were still several folds lower than the concentrations that will cause 50% mortality of exposed animals under laboratory conditions. Determination of heavy metal concentration in fish samples, sediment and water from odoayo river in adoekiti, ekitistate, nigeria. Afolabi chemistry department, obafemi awolowo university, ile. Oceans are ecosystems, quite susceptible to pollution.
It is shown that the concentrations of heavy metals like zn, pb cr, mn, ni, c u, and cd in the sediment are low, but require monitoring to prevent an increase. Determination of heavy metal in water and sediment of dez river, dezful, khuzestan province, iran mahboobe ghasemi, hadi moazed department of water sciences engineering, shahid chamran university, ahvaz, iran key words. However, the continental shelf are the most productive in terms of food supply and also most vulnerable to highest. Heavy metals and pesticides in northern african waters were studied more recently than other chemical parameters. The samples were treated and digested and analyzed using the. Heavy metals in surface water, sediments, fish and perwinklesof lagos lagoon. Lagos lagoon, water pollution, ions, heavy metals, water quality. Other heavy metals, such as cadmium, mercury, and lead, are highly poisonous. In this context, it is important to monitor the concentration and.
Determination of heavy metal concentration in fish samples. Heavy metal analyses and nutritional composition of raw and. Heavy metal contamination of ground, stream and river water ecosystem is a worldwide environmental problem3 and between the wide diversity of contaminants. However, similar trend in some heavy metals distribution was obtained in other. The lagoon receives effluents from industries in the agbara industrial estate. Pdf heavy metals in surface water, sediments, fish and. Lagos lagoon is a water body in the heart of the lagos metropolis.
Assessment of heavy metal contamination on dumpsite in kuyi. Assessment of sediment contamination by heavy metals in river orogodo agbor, delta state, nigeria. This study presented data on the baseline pollution of bottom sediment of river orogodo by heavy metals. Determination of heavy metals in fish tissues, water and. Ajao nigerian institute for oceanography and marine research, lagos, nigeria. Odiete 1999 reported the occurrence of heavy metals and their compounds as well as bacterial pathogens and sawdust in lagos lagoon. This study assessed the surface water quality of commodore channel, lagos lagoon with respect to its heavy metals pollution level using indexing approach to determine the sources of heavy metal and its associated pollution risk. Heavy metals in surface water, sediments, fish and perwinkles.
Epe lagoon is located in lagos state, an african megacity which is located in southwestern nigeria on the west coast of africa, within latitudes o6 23n and 6 o 41n and longitudes 2 o 42e and 3 o 42e. Studies on the occurrence and distribution of heavy metals in sediments in lagos lagoon and their effects on benthic microbial population article pdf available july 2010 with 369 reads. Comparative study of persistent toxic metal levels in land. The mean levels of heavy metals heavy metals subject category. Two of the stations were outside the lagos harbour, while the sediments and communities in lagos lagoon, nigeria 87 r. The heavy metals to which resistance was recorded were mercury, lead, zinc. Pdf geochemical fractionation of heavy metals in the. Furthermore, such parameter as acidity, phosphate, iron, manganese, copper, lead and free carbon dioxide were absent in the lagoon water at all the sampling points. The study of heavy metals and microbial contamination of tilapia specie in lagos lagoon revealed a higher value in the.
Heavy metal analyses and nutritional composition of raw. Tympanotonus fuscatus commonly called periwinkle is found in mangrove swamps and mud flat in low salinity areas of the lagos lagoon. The rate of bioaccumulation of heavy metals in aquatic organisms depends on the ability of the organisms to digest the metals. Ologe lagoon in relation to heavy metal levels in sediment and surface water. O soneye 1, olushola a abiodun 2, and amidu owolabi ayeni 1. Concentrations of cadmium, cobalt, copper, chromium, iron, manganese, nickel, lead and zinc were determined in surface sediments of the lagos lagoon, nigeria. Heavy metal pollution in sediments of marine ecosystems has gained the increased. Although there have been several studies reporting enrichment of heavy metals in water, sediment and fish in various rivers, there have been few studies reporting the level of heavy metals in lagos lagoon. Concentration and human health implications of trace.
The trend of accumulation of the metals is as follows. Comparative investigation of total, recoverable and. Determination of selected heavy metal and analysis of. Okoye chemistry department, federal university of technology, p. The longterm health effects of this on the populace depending on. Analytical investigation of pollutants in lagos coastal. Flame atomic absorption spectrometric determination of. Heavy metal pollution monitoring in vulnerable ecosystems. Studies on the occurrence and distribution of heavy metals. The tilapia zilli gills contained the highest concentration 52. Biomarkers of oxidative stress and heavy metal levels as.
The concentrations of metals in fish water environment were 5, 10 and 15 ppm for cd, cu and zn, respectively, while pb concentrations were 20, 40 and 80 ppm. Physicochemical parameters and heavy metal contents of. Surface water pollution poses a major risk to all biotic entities dependent on the water body. Six pollution indices were applied in assessing the pollution status of heavy metals in sediments.
Studies on the occurrence and distribution of heavy metals in. Heavy metal toxicity and the danger of their bioaccumulation in the food chain represent one of the major environmental and health problems of our modern society. Influence of heavy metals on earthworms, soil microbial. The choice of heavy metals for this study was based on the available, common and abundant metals from the results of a chemi cal survey of industrial effluents that empty into the lagos lagoon carried out by oyewo 1998 and a survey of the lagos lagoon water and sediment for heavy metals carried out by otitoloju 2001.
Assessment of sediment contamination by heavy metals in. Assessment of trace metal levels in fish species of lagos lagoon. Seasonal variation of heavy metals in sediment and water of lagos lagoon. Influence of heavy metals on earthworms, soil microbial community and mammals ahmad gholamalizadeh ahangar1 and abbas keshtehgar2 1 department of soil science, faculty of soil and water engineering, university of zabol, zabol, iran 2 ph. Surface water and sediment samples were collected from stations on the lagos lagoon based on their suitability for comparative analysis and future monitoring. The lagos lagoon is the largest of the four lagoon systems of the. Bioaccumulation of heavy metals in oily drill cuttings by. Full length research paper heavy metal concentration in. The concentration of chromium cr, lead pb, zinc zn, cadmium cd and physicochemical parameters were determined in surface water and sediment at different stations in lagos lagoon during the wet season. Sediments samples from twelve selected stations, that covers the.
Pdf integrated assessment of the heavy metal pollution. A study was conducted on physicochemical parameters and heavy metal contents of water from the mangrove swamps of lagos lagoon, nigeria. Heavy metals contents in water, sediment and fish from different lakes locations mediums cd cu hg pb zn reference odoiyaalaro tributary of lagos lagoon, nigeria water mgl1 sediments mgl1 1. The concentration of heavy metal in the flesh of the fish from the lagos lagoon is higher than that from the reference site for all the metals analyzed. In all eleven 11 physical and chemical parameters and six 6 heavy metals were investigated for water quality assessment of the. To estimate heavy metal pollution in the aquatic ecosystem, fishes are considered to be very useful biomonitors. Studies carried out in lagos lagoon revealed a higher value in the whole body of fish as well as different part than the water sample 22. The heavy metals to which resistance was recorded were mercury, lead, zinc, cobalt, copper and. This comparative analysis was carried out to monitor heavy metal concentrations in the lagos lagoon over the last 2 decades. According to another definition, a heavy metal is a metal, whose density is above 5 gcm3 anon. However, vanadium, iron, nickel, chromium, manganese are above copper on the periodic table and are all very important due to their effects on living organisms. Evaluation of heavy metals and oxidative stress with biochemical parameters as bioindicators of water pollution and fish in lake burullus, egypt mohamed ym aly, dalia mk elgaar, sally m salaah and mohammed h abdo pdf. This is a geochemical standard for heavy metal contamination levels in the soil by comparison with preindustrial levels.
Lagos lagoon, covering 700 km, is a brackish coastal lagoon, on the western part of nigeria 626 2 37n. D student of agroecology, zabol university, higher educational complex of saravan, iran. Water resources in lagos state, nigeria for domestic, industrial and commercial use are becoming scarce as a result of pollution of water bodies by heavy metals and other contaminants2. The lagos lagoon has a surface area of 208km2 fao, 1969.
Subsamples of the sediments were prepared and analyzed for heavy metal concentration. This study was carried out to assess the level of heavy metals pollution in ologe lagoon, agbara, lagos, nigeria. Again, nigeria is an oil and gas producing nation especially in the niger delta region. Heavy metals in the lagos lagoon sediments benedict c. The ocean is made up of continental shelf and deep oceans3. Bioaccumulation of heavy metals in fish tilapia zilli and. Lagos lagoon, to determine their trace metal levels using atomic. The levels in the water were 35 orders of magnitude lower than the values reported for the sediments. Heavy metals in surface water, sediments, fish and periwinkles of lagos lagoon. Geoenvironmental implications of heavy metals distribution.
The mean levels of heavy metals in the sediment of lagos lagoon were generally low and fell within the acceptable limits described by who,2004 and fepa. Some heavy metals are either essential nutrients typically iron, cobalt, and zinc, or relatively harmless such as ruthenium, silver, and indium, but can be toxic in larger amounts or certain forms. O2 1department of chemistry, covenantuniversity, p. The variation in microbial community structure under. Chemicals and chemical groups see more details in the sediments of lagos lagoon were generally low and fell within the acceptable limits described by world health organization, 2004 and fepa. Bioaccumulation, heavy metal, dez river, wastewater. Heavy metals were accumulated in the flesh of the fish to varying extent. Heavy metals concentration in lagos lagoon, nigeria meeting.
Assessment of sediment contamination by heavy metals in river. Lagos and lekki lagoons surface area is about 635 km2 and 285 km in perimeter. Seasonal variation in the bioaccumulation of heavy metals. The closed nature of this harbour coupled with the various discharges from the ports makes it particularly vulnerable to pollutants such as heavy metals. Sustainability free fulltext comparative investigation of total. Geochemical fractionation of heavy metals in the sediment at the point of discharge of iyalaro stream into lagos lagoon. Samples were collected at a depth of 1015 cm within a distance of 4 km from the shore line. The fish samples used for this study were obtained from fishermen at the landing sites in ologe lagoon freshwater and lagos lagoon. The contribution of metals from this lagoon to the mediterranean sea via umum drain contaminated landbased source was also estimated. The results revealed that heavy metal contents in fish parts varied according to concentrations in the environment and the type of fish tissue. They were also very much below the maximum allowable levels in marine waters set by the united states environmental protection.
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