scholarly journals Uptake and accumulation of heavy metals by water body and Azolla filiculoides in the Anzali wetland

2021 ◽  
Vol 11 (6) ◽  
Author(s):  
Mahsa Hassanzadeh ◽  
Rahmat Zarkami ◽  
Roghayeh Sadeghi
Keyword(s):  
Heavy Metals ◽  
Water Body ◽  
Point Sources ◽  
Anzali Wetland ◽  
Azolla Filiculoides ◽  
Sampling Locations ◽  
Significant Difference ◽  
Aquatic Flora ◽  
Removal Of Heavy Metals ◽  
Anzali International Wetland

AbstractThe Anzali international wetland is a valuable habitat to a wide variety of aquatic flora and fauna. This wetland ecosystem is being threatened due to various pollutants particularly the heavy metals discharging from different point and non-point sources. Concentration of various heavy metals (Cr, Pb, Hg, Cu, Zn, Cd, Ag and Ti) was examined in the water body and Azolla filiculoides (an exotic fern in the Anzali wetland). The samples regarding water and A. filiculoides were randomly carried out in three parts of the wetland (eastern, central and western parts) in May 2015. After preparing and digesting the samples, the concentration of the heavy metals was measured using ICP OES method. The obtained results showed that the concentration of Zn in water and A. filiculoides samples was higher than other heavy meals in all parts of the wetland (p < 0.05). Overall, concentration of the heavy metals was significantly higher in the eastern part of the wetland than other two sampling locations (p < 0.05). Also with comparing the concentration of the heavy metals in water and A. filiculoides, it was found that all examined metals (except Cd and Ag) in A. filiculoides had significantly higher concentration than water sample, while Cd and Ag in water and A. filiculoides did not have a significant difference with each other. Based on the results, it can be concluded that A. filiculoides can effectively absorb Cr, Pb, Zn, Hg, Cu, Cd, Ag and Ti so that it might be used as a valuable species for the bioremediation and the removal of heavy metals from the wetland.

scholarly journals PERFORMANCE EVALUATION OF BIOSORBENTS DOSAGE AND SIZE IN REMOVAL OF HEAVY METALS FROM WASTE WATER

2019 ◽  
pp. 139-148
Keyword(s):  
Heavy Metals ◽  
Null Hypothesis ◽  
Particle Sizes ◽  
Coconut Husk ◽  
Significant Difference ◽  
Removal Of Heavy Metals ◽  
Maximum Sorption ◽  
Test Of Hypothesis ◽  
Maize Cob ◽  
Level Of Significance

Biosorption experiments were conducted using non-living biosorbents, crushed maize cob and coconut husk to determine the effect of dosage and size on sorption of heavy metals from wastewater. Particle sizes passing the 6.3 mm, 2.0 mm, 0.6 mm, 0.212 mm and 0.063 mm BS sieve sizes were used in the experiments. Solutions of Cd (II), Pb (II), Ni (II), Cr (VI) and Cu (II), each prepared in different concentrations of 10 mg/ml, 20 mg/ml, 30 mg/ml, 40 mg/ml and 50 mg/ml were passed through the biosorbents. Results showed that coconut husk is a better biosorbent than maize cob with maximum sorption of 71.6 % at particle size of 0.063 mm and dosage of 50 mg/ml, this was followed by Chromium with 64.5 %, Lead with 56.8 %, Copper with 50.6 % and least by Nickel with 44.4 % all at 50 mg/ml. The test of hypothesis at 5 % level of significance showed that calculated at 10 mg/ml, 20 mg/ml, 30 mg/ml, 40 mg/ml and 50 mg/ml corresponding to 0.911, 0.219, 0.212, 0.691 and 0.619 were less than the tabulated t, the null hypothesis was chosen which indicated that there is no significant difference in the sorption affinities of these heavy metals to coconut husk and maize cob biosorbents. Coefficient of variation at various doses from 10 mg/ml to 50 mg/ml were 0.1275, 0.1145, +0.1181, 0.1032 and 0.1021 which showed very little variability. It was concluded that although there are differences in the sorption capacities of these biosorbents and the affinities of these heavy metals in attaching themselves on the surfaces of the biosorbents, the differences are not significant.

scholarly journals Stingless Bee Honey as Bio-Indicator of Heavy Metals Pollution in and around the University of Ilorin Environ Kwara State, Nigeria

2020 ◽  
Vol 24 (5) ◽  
pp. 773-778
Author(s):  
F.O. Okeola ◽  
O. Oluade ◽  
M.T. Liad
Keyword(s):  
Heavy Metals ◽  
Electrical Conductivity ◽  
Moisture Content ◽  
Atomic Absorption ◽  
Absorption Spectrometry ◽  
Stingless Bee ◽  
Free Acidity ◽  
Sampling Locations ◽  
Significant Difference ◽  
The University

Honey from stingless bees was examined as an indicator to evaluate the level of heavy metal pollution at six sampling locations (Oyun A, Oyun B, Bolounduro A, Bolounduro B, Jalala and Quarters) in and around University of Ilorin. Using the dry ashing digestion method the concentration of metals (Pb, Cr, Cd, Cu, Zn) were analyzed using Atomic Absorption Spectrometer. The concentration of metal (μg/kg) in the honey samples ranged from 0.010-0.001 for Cd, 3992.33-1755.67 for Zn, 2319.33-592.33 for Cu, 29.67 - 4.33 for Cr while Pb with concentration of 1μg/kg was found in only Quarter sample. Zn was the most abundant metal detectable in all the samples with the highest and least concentration obtainable from Oyun B and Bolounduro B respectively. Statistical analysis of the studied metals showed Cu and Zn differ significantly out of the five studied metals. The highest concentration of Cu was observed in Oyun A sample the least was found in the Bolounduro A. Highest concentration for Cr was found in Oyun B while the least was obtained in Oyun A sample. Cd presented the lowest concentration level in all tested samples.All the detected heavy metals in the honey samples were at concentrations within their respective WHO permissible limit.Physicochemical Parameters like density, moisture content, free acidity, pH, ash content and electrical conductivity of the honey samples were also predetermined. The mean density of the honeys is 1.44±0.02, moisture content 14.25±2.52, pH 4.61±0.25, free acidity 44.08±2.46, Ash 1.48±0.64 and electrical conductivity 0.04±0.03. There was significant difference noted between the studied physicochemical parameters and strong correlations observed among some of the studied parameters.Some of the positive and negative detection of the result were found to correlate with activity and suspected pollutant in some of these sampling locations. Keywords: Honey, Stingless Bee, Heavy Metals, Atomic Absorption Spectrometry

scholarly journals Heavy Metals Content in Kaolin Mined Soil and Water Body at Ohiya, Umuahia South, Abia State, Nigeria

2021 ◽  
pp. 58-68
Author(s):  
C. E. Igwe ◽  
C. M. U. Ajero ◽  
A. A. Amaechi ◽  
P. O.` Nzenwa
Keyword(s):  
Heavy Metals ◽  
Water Body ◽  
Anthropogenic Activities ◽  
Contamination Factor ◽  
Soil Samples ◽  
Pollution Indices ◽  
Mining Activities ◽  
Wet Season ◽  
Significant Difference ◽  
Very High

Heavy metals (HM) have been a global concern for its toxic and detrimental effect on the environment especially when it exceeds the permissible limit through anthropogenic activities like kaolin mining. Kaolin mining has improved the economic wellbeing of the local people through employment and otherwise; and at the same time attached with environmental consequences that threatens the livelihood of the community members. This study was carried out to ascertain the concentrations of selected heavy metals in kaolin mined soils and water body and its pollution density using single pollution indices such as contamination factor (CF), geo-accumulation (Igeo) and ecological risk factor (Er ). Soil sample were collected from three different kaolin mined sites labelled (A,B and C) also surface water samples were collected from upper and down streams of Iyi-ugbohoroAmaudara, both samples were digested and elemental analysis was carried out using Atomic Absorption Spectrophotometer (AAS UNICAM 919 model). The concentration of the metals in three different kaolin mined soil samples ranges from Pb(40.00, 52.00 and 55.09 mg/kg) Cr(45.01, 70.00 and 71.00 mg/kg) Ni( 32.10, 50.50 and 51.00 mg/kg) Cd( 2.16, 6.25 and 6.15 mg/kg) Co( 19.68, 57.06 and 56.00 mg/kg) Se(1.06, 0.50, and 1.00 mg/kg) Mn(0.001, 0.01 and 0.01 mg/kg) Hg( 2.01, 2.00 and 2.50 mg/kg) As( 1.07, 1.10 and 1.05 mg/kg) and Cu(33.01, 60.00 and 57.5 mg/kg). Results from single pollution indices used for the selected heavy metals from kaolin mined soil, samples (A,B and C) showed that Mn, As, Cr, Ni and Cu indicated low to moderate contamination factor while Cd, Se, Co and Hg indicated high to very high contamination factor in all the samples. The distribution trend of heavy metals concentrations in the upper and down streams of the river body during wet season, showed that there were significant difference between upper and down streams while dry season showed variations in significant differences between the upper and down streams of some of the heavy metals. The study therefore concludes that kaolin soils are contaminated with heavy metals as a result of kaolin deposit and its mining activities. The single pollution indices used for the study pointed out that Cd, Se, Co and Hg are very high in the kaolin soils. The surface waters of Iyi-ugbohoroAmaudara River at the study area are polluted with heavy metals as a result of kaolin mining activities in the area; more especially during wet season of the study. Consequently, these outcomes would pose a toxic effect to both fauna and flora and possibly threatens the aquatic lives and the local populace.

Biosorption: An Eco-Friendly Technique for the Removal of Heavy Metals

2011 ◽  
Vol 2 (3) ◽  
pp. 1-8 ◽  
Author(s):  
Sasmita Sabat ◽  
◽  
R V Kavitha R V Kavitha ◽  
Shantha S L Shantha S L ◽  
Gopika Nair ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Removal Of Heavy Metals

Study of the Cu(II) removal from aqueous solutions by adsorption on titania

2013 ◽  
Vol 12 (3) ◽  
pp. 239-247
Keyword(s):  
Heavy Metals ◽  
Ionic Strength ◽  
Toxic Metals ◽  
Low Cost ◽  
Lateral Interaction ◽  
Tio2 Surface ◽  
High Toxicity ◽  
Removal Of Heavy Metals ◽  
Solution Parameters ◽  
Kinetics Of

The removal of heavy metals from wastewaters is a matter of paramount importance due to the fact that their high toxicity causes major environmental pollution problems. One of the most efficient, applicable and low cost methods for the removal of toxic metals from aqueous solutions is that of their adsorption on an inorganic adsorbent. In order to achieve high efficiency, it is important to understand the influence of the solution parameters on the extent of the adsorption, as well as the kinetics of the adsorption. In the present work, the adsorption of Cu(II) species onto TiO2 surface was studied. It was found that the adsorption is a rapid process and it is not affected by the value of ionic strength. In addition, it was found that by increasing the pH, the adsorbed amount of Cu2+ ions and the value of the adsorption constant increase, whereas the value of the lateral interaction energy decreases.

Synergistic Effect of Rhamnolipid and Saponin Biosurfactants on Removal of Heavy Metals from Oil Contaminated Soils

2020 ◽  
Vol 57 (2) ◽  
pp. 109-114
Author(s):  
Amirhossein Dolatzadeh khiyavi ◽  
Reza Hajimohammadi ◽  
Hossein Amani ◽  
Hadi Soltani
Keyword(s):  
Heavy Metals ◽  
Synergistic Effect ◽  
Contaminated Soils ◽  
Removal Of Heavy Metals

Distribution and Contamination Status of Heavy Metals in the Surface Sediments along Western Coast of Bali Strait, Banyuwangi

2018 ◽  
Vol 1 (2) ◽  
Author(s):  
Defri Yona ◽  
Syarifah Hikmah Julinda Sari ◽  
Anedathama Kretarta ◽  
Citra Ravena Putri Effendy ◽  
Misba Nur Aini ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Pollution ◽  
Contamination Factor ◽  
Pollution Index ◽  
Western Coast ◽  
Sampling Locations ◽  
Accumulation Index ◽  
Geo Accumulation Index ◽  
Geo Accumulation

This study attempted to analyze the distribution and contamination status of heavy metals (Cu, Fe and Zn) along western coast of Bali Strait in Banyuwangi, East Java. Bali Strait is one of the many straits in Indonesia with high fisheries activities that could potentially contributed to high heavy metal pollution. There were five sampling areas from the north to south: Pantai Watu Dodol, Pantai Kalipuro, Ketapang Port, Pantai Boom and Muncar as the fish landing area. Heavy metal pollution in these locations comes from many different activities such as tourism, fish capture and fish industry and also domestic activities. Contamination factor (CF), geo-accumulation index (Igeo) and enrichment factor (EF) of each heavy metal were calculated to obtain contamination status of the research area. The concentrations of Fe were observed the highest (1.5-129.9 mg/kg) followed by Zn (13.2-23.5 mg/kg) and Cu (2.2-7.8 mg/kg). The distribution of Cu, Fe and Zn showed variability among the sampling locations in which high concentrations of Cu and Zn were higher in Ketapang Port, whereas high concentration of Fe was high in almost all sampling locations. According to the pollution index, contamination factors of Cu, Fe and Zn were low (CF < 1 and Igeo < 1). However, high index of EF (> 50) showed high influence of the anthropogenic activities to the contribution of the metals to the environment. This could also because of the high background value used in the calculation of the index due to the difficulties in finding background value from the sampling areas.Keywords: heavy metals, pollution index, contamination factor, geo-accumulation index, Bali Strait

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