Environmental Effect of Dredging and Geochemical Fractionation of Heavy METALS in Sediments Removed from River
Ogbu Victor,
Osu Charles Ikenna,
Iwuoha Godson Ndubuisi
Issue:
Volume 6, Issue 4, December 2018
Pages:
44-49
Received:
5 August 2018
Accepted:
6 September 2018
Published:
10 January 2019
DOI:
10.11648/j.mc.20180604.11
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Abstract: Geochemical fractionation of six heavy metals; Zn, Pb, Cd, Cu, Cr, and Ni in soil from two dredging sites at Chokocho and Umuechem communities in Etche Local Government Area of Rivers State, Nigeria, which is characterized by domestic, oil exploration and other industrial activities. The heavy metal concentration determined were 26.30 ± 0.38 mg/kg, Pb; 10.60 ± 0.04 mg/kg, Cd; 486.00 ± 1.20 mg/kg, Zn; 35.50 ± 0.30 mg/kg, Cr; 43.50 ± 0.40 mg/kg, Ni and 37.70 ± 0.10 mg/kg, Cu for Chokocho site. For Umuechem site, the concentration of the metals revealed were 18.40 ± 0.10 mg/kg, Pb; 6.80 ± 0.70 mg/kg, Cd; 437.00 ± 0.60 mg/kg, Zn; 29.30 ± 0.20 mg/kg, Cr; 36.40 ± 0.10 mg/kg, Ni; and 28.30 ± 0.20 mg/kg, Cu. Results from umuechem site was greater than Chokocho site. Heavy metal fractionation using conventional method was adopted for sequential extraction which was accomplished in five steps. Results revealed that Cd and Pb were dispersed more at exchangeable phase in the sample; Cu and Zn were the least bioavailable. Cd, Pb, and Cr show health risks because of high percent in the exchangeable or dissolved fraction. The results of the analysis also revealed that the bioavailablity and mobility of the heavy metals were in order; Cd > Pb > Cr > Ni > Zn > Cu.
Abstract: Geochemical fractionation of six heavy metals; Zn, Pb, Cd, Cu, Cr, and Ni in soil from two dredging sites at Chokocho and Umuechem communities in Etche Local Government Area of Rivers State, Nigeria, which is characterized by domestic, oil exploration and other industrial activities. The heavy metal concentration determined were 26.30 ± 0.38 mg/kg,...
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Color Presenting Products of Amino Acids Reactions- Qualitative Tests
Mohamed Ibrahim Elzagheid
Issue:
Volume 6, Issue 4, December 2018
Pages:
56-60
Received:
4 December 2018
Accepted:
18 December 2018
Published:
17 January 2019
DOI:
10.11648/j.mc.20180604.13
Downloads:
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Abstract: This paper presents simple approach for systematic chemistry learning of amino acids’ qualitative experiments. In this laboratory practice, students are requested to perform qualitative tests for certain amino acids and be able to distinguish them according to their color reactions. The chemical knowledge and concepts of amino acids reactions with certain reagents are deeply discussed to promote students' readiness for their future career as chemists and lab technicians. In this approach, all written laboratory activities are linked with colored reactions’ illustrations to facilitate better understanding of all laboratory tests.
Abstract: This paper presents simple approach for systematic chemistry learning of amino acids’ qualitative experiments. In this laboratory practice, students are requested to perform qualitative tests for certain amino acids and be able to distinguish them according to their color reactions. The chemical knowledge and concepts of amino acids reactions with ...
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