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Q., Ma Lena

doi:10.2134/jeq1997.261259x

Cited by 31 publications

(7 citation statements)

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“…Duplicate samples were analysed to check precision of the analytical methods and instruments. The spike recovery test on some soil samples for Pb was found to be within 100 ± 10 % similar to [24].…”

Section: Methodsmentioning

confidence: 71%

Heavy metals pollution at municipal solid waste dumpsites in Kano and Kaduna states in Nigeria

Anake¹,

Adie²,

Osibanjo³

2009

Bull. Chem. Soc. Eth.

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ABSTRACT.ABSTRACT. ABSTRACT. ABSTRACT. Soil samples collected from two major dumpsites each in Kano and Kaduna states were investigated for heavy metals pollution. Each of the dumpsite was divided into north, south, east and west. Four soil samples were collected at a depth of 0-15 cm from each part and pooled to form a composite sample. Soil samples from reserve areas within the same geographical locations as the dumpsites were collected as control. Acid-extractable cadmium (Cd), chromium (Cr), nickel (Ni) and lead (Pb) were determined using 2 M nitric acid solution and atomic absorption spectroscopy. The ranges of Cd, Cr, Ni and Pb levels for all the dumpsites were 0. 30-49.8, 5.76-139, 0.39-19.1 and 42.6-9662 mg/kg, respectively. Kano dumpsite 2 was found to pollute most with Cd, Cr and Pb in 50-100 % soil samples collected having concentrations higher than the threshold limits set by regulatory body. Paper and food scraps showed higher percentages in both Kano and Kaduna dumpsites. The soil was high is sand for all the dumpsites implying high leaching potentials of the heavy metals pollutants. KEY WORDS: KEY WORDS: KEY WORDS:

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Section: Methodsmentioning

confidence: 71%

Heavy metals pollution at municipal solid waste dumpsites in Kano and Kaduna states in Nigeria

Anake¹,

Adie²,

Osibanjo³

2009

Bull. Chem. Soc. Eth.

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“…The analysis of treated tailings was carried out by two different procedures of sequential extraction. The first procedure, corresponding to Tessier [19,20], divides metals into six fractions, i.e., water-soluble, exchangeable, carbonate-bound and extractable at pH = 5, Fe-Mn oxide-bound, organic, sulfide-bound and residual. The sequential extraction steps proposed by Tessier have been widely used for metal partitioning in soil and sediments.…”

Section: Methodsmentioning

confidence: 99%

“…Usually the sequential extraction methods divide the element into an exchangeable fraction, carbonate-bound fraction, Fe-Mn oxide-bound fraction, organic and sulfide fraction and residual fraction [16,17,18,19,20]. Some modifications have been proposed, such as the application of a sequential extraction procedure, which divides the sample into six fractions: water, soluble, exchangeable, carbonate-bound, Fe-Mn oxide-bound, organic-bound and residual fractions for the analysis of Cu, Cd, Ni and Zn in contaminated soils [21].…”

Section: Introductionmentioning

confidence: 99%

Copper Analysis by Two Different Procedures of Sequential Extraction after Electrodialytic Remediation of Mine Tailings

Lazo

Urtubia

et al. 2019

IJERPH

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The analysis of Cu distribution in pre-treated mine tailings after electrodialytic remediation was carried out by using two methods of sequential extraction. The initial content of copper in the tailings was 1109 mg Cu/kg of dry tailing, where close to 40% of the sample in weight corresponded to a soluble fraction. The tailing was treated with a leaching solution for 24 h. Three different solutions were tested: H2SO4 + HNO3 with pH = 1.9; H2SO4 + HNO3 with pH = 4.2; and NH4Cl 0.8 mol/L with pH = 5.5. After that, electrodialytic remediation experiments were carried out using an electric field of 2.7 V/cm for 15 days. The best performance for the complete cell was obtained with H2SO4 + HNO3 solutions, with a copper removal efficiency in the range of 62% to 67% and a current efficiency between 6% and 9%. The results of the remaining copper concentration between anode and cathode, from both procedures of sequential extraction, showed similar trends. The differences were mainly attributed to the use of different extractant solutions and extraction times. Soluble and exchangeable fractions were easily removed, with efficiencies higher than 80%. The lowest copper removal efficiency was obtained with NH4Cl 0.8 mol/L.

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“…After each experiment, the tailings were divided into six equal sized slices throughout the cell, each one with a thickness of 0.013 m. All slices were analyzed by the sequential extraction method [19,20]. Total copper was measured in the slices closest to the anode and closest to the cathode, humidity and pH were measured in each slice for all experiments.…”

Section: Methodsmentioning

confidence: 99%

“…This procedure separates heavy metals into six fractions: water-soluble, exchangeable, acid soluble bound, Fe-Mn oxides bound, organic and sulfide bound and residue [19,20]. In the case of tailings, due to the origin, no organic matter or carbonate are expected in the composition, and for this reason the fractions will be called sulfide fraction and acid soluble fraction, the latter corresponding to the fraction extractable at pH 5.0 [20,21].…”

Section: Methodsmentioning

confidence: 99%

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

Lazo

Hansen

Lazo

et al. 2019

IJERPH

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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.

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Cited by 31 publications

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Heavy metals pollution at municipal solid waste dumpsites in Kano and Kaduna states in Nigeria

Heavy metals pollution at municipal solid waste dumpsites in Kano and Kaduna states in Nigeria

Copper Analysis by Two Different Procedures of Sequential Extraction after Electrodialytic Remediation of Mine Tailings

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

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