Research on the Improvement and Application of Chemical Sequential Extraction of Phosphorus in Sediments

2014 ◽  
Vol 1010-1012 ◽  
pp. 452-455
Author(s):  
Zhe Hu ◽  
Ke Feng Zhang ◽  
Lei Liu
Keyword(s):  
Sequential Extraction ◽  
Extraction Method ◽  
Chemical Speciation ◽  
Extraction Process ◽  
Sodium Dithionite ◽  
Nansi Lake ◽  
Existing Problems ◽  
Sequential Extraction Method ◽  
Excess Sodium ◽  
Chemical Sequential Extraction

By the chemical sequential extraction method, various chemical speciation of phosphorus were extracted from shallow sediments of Nansi Lake. Aiming at the existing problems of lower concentration of phosphorus, the method combined the original sequential extraction and Mo-Sb Anti spectrophotometric method was improved to reduce the interference caused by stratification and chromogenic reaction. In addition, due to the presence of excess sodium dithionite, the extracting solution need to be diluted during occlude phosphorus (Oc-P) extraction process.

Validation of an Arsenic Sequential Extraction Method for Evaluating Mobility in Sediments

2001 ◽  
Vol 35 (13) ◽  
pp. 2778-2784 ◽  
Author(s):  
N. E. Keon ◽  
C. H. Swartz ◽  
D. J. Brabander ◽  
C. Harvey ◽  
H. F. Hemond
Keyword(s):  
Sequential Extraction ◽  
Extraction Method ◽  
Sequential Extraction Method

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.

CHEMICAL FORMS OF Zn, Mn, Fe and Pb IN SOIL SAMPLES FROM THE VICINITY OF SOME MAJOR DUMPSITES IN GOMBE METROPOLIS, GOMBE STATE NIGERIA

2020 ◽  
Vol 45 (4) ◽  
Author(s):  
A.O. Abdullahi ◽  
A. Usman ◽  
A.H. Zakari ◽  
J.R. Tukur
Keyword(s):  
Organic Matter ◽  
Extraction Method ◽  
Chemical Speciation ◽  
Research Work ◽  
Soil Samples ◽  
Residual Fraction ◽  
Mn Oxide ◽  
Exchangeable Fraction ◽  
Sequential Extraction Method ◽  
Atomic Absorption Spectrometric

This research work is aimed at determining the chemical speciation of metals Zn, Mn, Fe and Pb in soil samples from three major dumpsites within Gombe metropolis, Gombe state. The renowned five steps Tessier sequential extraction method was employed in the extraction of the heavy metals. The metals were extracted into five fractions namely: Exchangeable (F1), carbonate bound (F2), Fe-Mn oxide bound (F3), Bound to organic matter (F4) and the residual fraction (F5) in order of decreasing mobility. The elemental analysis of the fractions was carried out using atomic absorption spectrometric technique. The results showed Zn was predominantly bounded to the exchangeable fraction with 32.66±0.31 mg/kg (54.18%) and least in the Fe – Mn oxide fraction with 0.01±0.00 mg/kg (0.02%). The trend in its abundance is in the order F1> F2>F5>F4>F3. Mn was predominantly associated with the bound to carbonates fraction with the value of 103.3.±3.30 mg/kg (56.14%) and least in the exchangeable with the value of 1.30±1.85mg/kg (2.13%) its occurred in the order F2>F3>F4>F5>F1. The concentration of Fe was highest in the residual fraction with the value of 25.90±1.75mg/kg (45.45%)and least in the carbonate bound fraction wi th 5.10±0.40 mg/kg (2.13%) the order is F5>F4>F3>F2>F1. Pb was not detected in most of the fraction but highest in bond to carbonate and bond to organic matter fraction with the values of 6.64±4.12 mg/Kg (70.64 %) and 2.76±0.10 mg/Kg (29.36 %) respectively in two different samples. It was however established that Zn, Mn and Pb were mostly associated with the first three fractions thus, showed high bio-availabilty whereas Fe was found in the residual fraction and is expected to be low in mobility and less bioavailable. 

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