scholarly journals SPECIATION OF METALS IN SEDIMENTS FROM DAMS AND RIVERS ALONG GOLD MINING VICINITIES IN ZAMFARA STATE

2020 ◽  
Vol 4 (2) ◽  
pp. 590-598
Author(s):  
Moses Sunday
Keyword(s):  
Heavy Metals ◽  
Sequential Extraction ◽  
Gold Mining ◽  
Absorption Spectrometry ◽  
Water Soluble ◽  
Food Crop ◽  
Residual Phase ◽  
Sequential Extraction Method ◽  
Five Elements ◽  
Chemical Association

Sediments samples from three dams and rivers in Zamfara State were analyzed for chemical association of the metals (Zn, Cd, Cr, Pb and Hg) using sequential extraction method to determine the amount of the heavy metals available for absorption. The concentrations were determined in four fractions. The concentration of heavy metals in the food crop (tomatoes) was also determined using atomic absorption spectrometry (AAS). The sequential extraction was carried out using (1.0 g) of powder sample weighed into a glass centrifuge (60 ml) and fractions were obtained. Comparing the way the metals were bound to the different fractions in the sediments, it showed clearly that the metals in the sediments are bound to different fractions with different strength. Cd and Cr were primarily in the carbonate bound fraction while Zn and Hg appear mainly in the residual phase. Pb was found in carbonate, exchangeable and water soluble fractions. The distribution of the five metals studied revealed their differences in mobility. From the five elements studied, Cd (14.739- 39.931%) and Pb (0.105- 9.832%) appeared to be the most readily solubilized, thus making these elements the most potentially bioavailable. This may present a real threat as Cd and Pb are transferred into the food chain from soil contaminated by these metals. Zn and Cr levels in the tomatoes, were within international standard while Cd (0.1022 mg/l), Pb (0.2104 mg/l) and Hg (1.8818 mg/l) levels were far above (0.01, 0.01 and 0.001mg/l) USEPA standard for drinking water. Two indices such as contamination

scholarly journals The Determination of Chemical Forms of Heavy Metals in Shooting Area Contaminated Soil Using Sequential Extraction Method

2015 ◽  
Vol 20 (6) ◽  
pp. 111-116 ◽  
Author(s):  
Gyeonghye Moon ◽  
Hongki Park ◽  
Kyoungkeun Yoo ◽  
Jha Manis Kumar ◽  
Alorro Richad Diaz ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Sequential Extraction ◽  
Contaminated Soil ◽  
Extraction Method ◽  
Chemical Forms ◽  
Sequential Extraction Method

scholarly journals Application of a Sequential Extraction Method for Analyzing Cu Distribution in Pre-Treated Mine Tailings after Electrodialytic Remediation

2019 ◽  
Vol 16 (4) ◽  
pp. 584 ◽  
Author(s):  
Andrea Lazo ◽  
Henrik Hansen ◽  
Pamela Lazo ◽  
Claudia Gutiérrez
Keyword(s):  
Sequential Extraction ◽  
Mine Tailings ◽  
Extraction Method ◽  
Constant Electric Field ◽  
Extraction Procedure ◽  
Water Soluble ◽  
Copper Compounds ◽  
Leaching Solution ◽  
Sequential Extraction Method ◽  
Pre Treatment

Mine tailings have been analyzed by a sequential extraction procedure after their pre-treatment with a leaching solution for 24 h and electrodialytic remediation during 15 days with a constant electric field of 2.7 V cm−1. Four leaching solutions were tested: H2SO4 + HNO3 (2:1 vol.) pH = 1.9; H2SO4 + HNO3 (2:1 vol) pH = 4.2; NH4Cl 0.8M, pH = 5.5 and 30% H2O2 adjusted to pH 2 with HNO3 1M + HCl 1M. After the treatment, the tailings were divided in six slices from anode to cathode. The highest removal efficiency of copper was obtained with H2SO4 + HNO3 pH = 1.9, which allows one to remove 67% of the copper in the total cell and 85% of the copper in the slice closest to anode. The same solution with pH = 4.2 allows one to remove 62% of the total copper. The analysis realized by the sequential extraction method indicates the easy removal of water-soluble and exchangeable fractions in all experiments, moreover, residual and sulfide are the less mobile fractions. The general trend was the movement of copper associated to different fractions from anode to cathode and its accumulation closest to the cathode in the case of exchangeable, Fe-Mn oxides and acid soluble fractions, possibly due to some precipitation of copper compounds associated with less acidic conditions.

Heavy Metals Speciation of Size-fractionated Sediments Collected from Combined Sewer System Using Sequential Extraction Method

2010 ◽  
Vol 5 (3) ◽  
Author(s):  
K. Kojima ◽  
I. Kasuga ◽  
F. Kurisu ◽  
H. Furumai
Keyword(s):  
Heavy Metals ◽  
Sequential Extraction ◽  
Extraction Method ◽  
Metal Speciation ◽  
High Mobility ◽  
Aquatic Organisms ◽  
Total Content ◽  
Combined Sewer ◽  
Sequential Extraction Method ◽  
The Impact

Sediments deposited in sewer pipes have been concerned as one of the main pollution loads from combined sewer overflow (CSO). Since the toxicity, mobility and bioavailability of heavy metals depend on their speciation, it is necessary to consider not only their amounts but also their speciation to evaluate the adverse effects on aquatic organisms in receiving waters. Sequential extraction method was applied to the size-fractionated sediments to evaluate heavy metal speciation. Although the speciation of Cr, Ni, Cu, Zn and Pb differed among sampling points as well as their contents, the content of easily exchangeable fraction was strongly correlated with total content for all the metals except for Cu. The result of heavy metals speciation revealed that Ni, Zn and Pb in combined sewer sediments could have high mobility potential. The result of size-fractionated sediments indicated that the contents and mobility potential of the heavy metals were larger as particle size was finer. Thus, it is important to control fine sediments in combined sewer to reduce the impact of CSO pollution.

Determination of heavy metals in sediments of the Ergene River by BCR sequential extraction method

2014 ◽  
Vol 72 (9) ◽  
pp. 3293-3305 ◽  
Author(s):  
Ali Sungur ◽  
Mustafa Soylak ◽  
Selehattin Yilmaz ◽  
Hasan Özcan
Keyword(s):  
Heavy Metals ◽  
Sequential Extraction ◽  
Extraction Method ◽  
Bcr Sequential Extraction ◽  
Sequential Extraction Method

Sequential Extraction of Vanadium in Different Soil Samples Using Conventional and Ultrasonic Devices

2013 ◽  
Vol 96 (3) ◽  
pp. 650-656 ◽  
Author(s):  
Sumaira Khan ◽  
Tasneem Gul Kazi ◽  
Nida Fatima Kolachi ◽  
Imran Afridi ◽  
Naeem Ullah
Keyword(s):  
Sequential Extraction ◽  
Thermal Power ◽  
Electrothermal Atomic Absorption Spectrometry ◽  
Total Content ◽  
Standard Addition ◽  
Absorption Spectrometry ◽  
Soil Samples ◽  
Bcr Sequential Extraction ◽  
Sequential Extraction Method ◽  
Agricultural Areas

Abstract A rapid ultrasound accelerated sequential extraction (USE) procedure was used to develop chemical partitioning of vanadium (V), proposed by the Community Bureau of Reference/European Union Measurement and Testing Programme (BCR). The effects of ultrasonic treatment on the extraction of V in different soil samples collected from the vicinity of a thermal power plant and agricultural areas of Sindh, Pakistan, were evaluated. In the conventional BCR-sequential extraction method, each extraction step takes 16 h. With the use of ultrasound energy, Steps 1–3 of the USE procedure (excluding the hydrogen peroxide digestion in Step 3, which was performed conventionally) could be completed in 45, 40, and 45 min, respectively. Analysis of the extracts was performed by electrothermal atomic absorption spectrometry. The total contents of V were obtained by digestion with two acid mixtures: H2O2–HF–HNO3–H2SO4 and HClO4–HF–HNO3–H2SO4. Validation was performed by the standard addition technique. Results obtained for each fraction by both methods were statistically compared; no significant differences were found (P < 0.05). The accuracy of the USE procedure was checked by comparing the sum of the V contents in the three fractions and residue with the total content of V. The results of this work provide information on the chemical composition, distribution, and potential mobility of the V in different soils.

scholarly journals The risk scale estimation of the agricultural environment pollution by heavy metals using the sequential extraction method

2007 ◽  
Vol 9 (3) ◽  
pp. 151-154
Author(s):  
Janusz Rosada ◽  
Joanna Grzesiak ◽  
Grzegorz Schroeder
Keyword(s):  
Heavy Metals ◽  
Sequential Extraction ◽  
Extraction Method ◽  
Composition Analysis ◽  
Environment Pollution ◽  
Scale Estimation ◽  
Agricultural Environment ◽  
Sequential Extraction Method ◽  
Availability Assessment ◽  
Risk Scale

The risk scale estimation of the agricultural environment pollution by heavy metals using the sequential extraction method From among various industrial contaminants which can pollute agricultural environment, heavy metals having the capacity of bioaccumulation deserve special attention. The total composition analysis of the heavy metals content in the polluted soils does not provide enough data about their accessibility to the crops cultivated on these soils. It is very important to have the information about the forms in which the examined element exists, because it decides about its mobility and toxicity for the environment. Using the sequential chemical extraction method of Zeien and Brümmer the fractions of Cu, Pb, Zn, Cd and As in the soils influenced by emissions from the Copper Smelter GŁOGÓW, were investigated. The aim of these investigations was to determine the availability assessment of the mentioned elements to the crops cultivated in this region.

Speciation of heavy metals in untreated domestic wastewater sludge by time saving BCR sequential extraction method

2007 ◽  
Vol 42 (5) ◽  
pp. 649-659 ◽  
Author(s):  
Mohammad K. Jamali ◽  
Tasneem G. Kazi ◽  
Hassan I. Afridi ◽  
Mohammad B. Arain ◽  
Nusrat Jalbani ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Sequential Extraction ◽  
Extraction Method ◽  
Domestic Wastewater ◽  
Wastewater Sludge ◽  
Bcr Sequential Extraction ◽  
Time Saving ◽  
Sequential Extraction Method
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