Speciation Analysis of Heavy Metals of Core Amuta Sediments in Lianhua Lake

2010 ◽  
Vol 113-116 ◽  
pp. 716-719
Author(s):  
Fu Hua Xuan ◽  
Shu Ying Zang
Keyword(s):  
Heavy Metals ◽  
Speciation Analysis ◽  
Chemical Forms ◽  
Organic Sulfide ◽  
The Core ◽  
Mn Oxide ◽  
Binding Forms ◽  
Residue Fraction

The BCR-SEP method was used to determine the binding forms of heavy metals in Amuta Lake(AMT) in this paper. The chemical forms of heavy metals, namely extractable fractions or valid fractions, including exchangeable-carbonate fraction, Fe-Mn oxide fraction and Organic-sulfide fraction .The results of the partitioning study indicated that in the core AMT sediments, Cr, Fe and Ni are mainly associated with the residue fraction, Cu is mainly concentrated in the Fe–Mn oxide fractions and residue fraction, Mn is concentrated in the exchangeable-carbonate fraction and residue fraction. Zn is concentrated in organic-sulfide fraction and residue fraction.

Chemical Forms and Bioavailability of Cu, Zn, Ni and Cd in Fly Ash and Calcium Oxide Stabilized Sewage Sludge

2012 ◽  
Vol 573-574 ◽  
pp. 560-567
Author(s):  
De Chun Su ◽  
Woon Chung Wong
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Sewage Sludge ◽  
Calcium Oxide ◽  
Coal Fly Ash ◽  
Acid Soil ◽  
Dry Weight ◽  
Residual Fraction ◽  
Chemical Forms ◽  
Mn Oxide

Coal fly ash at 10 and 35% (m/m) was mixed with dewatered sewage sludge (on fresh weight basis) and then the ash-sludge mixture was mixed separately with 1 and 2% (m/m) calcium oxide to kill the entrained pathogens and to suppress the availability of heavy metals enriched in sludge. A sequential extraction method was used to determine chemical forms of Cu, Zn, Ni and Cd in the sludge and fly ash and CaO stabilized sludge. A loamy acid soil amended with sludge and stabilized sludge was used to grow corn under greenhouse conditions. The results showed that sewage sludge amended with coal fly ash and CaO could reduce the availability of Cu, Zn, Ni and Cd in the sludge. Increasing fly ash and CaO amendment rate significantly increased pH and reduced DTPA extractable Cu, Zn, Ni, Cd contents and EC of the sludge. Fly ash and CaO addition significantly reduced the Zn and Cd concentration in exchangeable and total fraction. But add CaO significantly increase the Cu concentration in exchangeable fraction. Majority of Cu was associated with organic form, but Zn and Ni were associated with Fe-Mn oxide and residual forms. Fly ash and CaO addition significantly increase the percentage of Zn and Ni in residual fraction. Addition of 10% fly ash amended sludge and 10% fly ash then 1% CaO amended sludge significantly increased the dry weight yield and decreased the concentrations of Zn, Cu and Cd in shoot of corn. The results demonstrate the beneficial effects of fly ash and CaO addition on suppress the availability of heavy metals enriched in the sludge.

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 Immobilization Potential of Cow Manure for Heavy Metal Remediation from Refuse Dump Soil

2021 ◽  
pp. 44-55
Author(s):  
Ezeudu Emeka Christian ◽  
Oli Christian Chukwuemeka ◽  
. Enenche ◽  
Elaigwu Daniel ◽  
Anekwe Ozioma Juliana ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Ricinus Communis ◽  
Cow Manure ◽  
Industrial Chemistry ◽  
Refuse Dump ◽  
Anambra State ◽  
Mn Oxide ◽  
Greenhouse Study ◽  
Mobility Factor ◽  
Heavy Metal Remediation

Aims: The present study investigated the effect of cow manure amendment on fractionation and availability of some heavy metals (Cd, Cu, Cr, Mn, Pb and Zn) in refuse dump soil. Study Design: A greenhouse study experiment was conducted to determine the uptake of the metals by Ricinus communis in dump soil treated with 0%, 5%, 10% and 20% cow manure. Place and Duration of Study: The study was carried out at the Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University Awka, Anambra State, Nigeria, between May and October 2018. Methodology: Experimental pots were filled with 2.0kg refuse dump soil in a green house and treated with 5%, 10% and 20% of Cow manure in three replicates per treatment. The seeds of Ricinus communis were planted in each pot and analysed after 12 weeks of planting for heavy metals using AAS. Sequential extraction was carried out on the treated soil after the harvest with each extract further analysed for heavy metals using AAS. Results: Application of cow manure significantly (p ˂ 0.05) affected the redistribution and the mobility of the heavy metals in the dump soil; as the concentration of the amendment increased, heavy metals in the mobile fractions reduced. 20% amendment had the best immobilization effect as the mobility factor decreased with increasing manure amendment. The mobility factors at 20% amendment were 18.34%, 15.82%, 5.23%, 15.86%, 25.56% and 12.81% for Cd, Cr, Cu, Mn, Pb and Zn respectively with the general trend of metal forms given as: residual > bound to organic > bound to Fe-Mn oxide > bound to carbonate > exchangeable. Conclusion: Cow manure amendment of the dump soil decreased the availability of heavy metals for plant uptake; and the metal uptake generally decreased as percentage amendment increased. Cow manure is therefore a good immobilizing agent for remediation of Cd, Cr, Cu, Mn, Pb and Zn in polluted soils.

Heavy Metals (Fe, Zn, Mn, Cr, As) Speciation Analysis and Ecological Risk Assessment in the Surface Sediments of WuHe Wetland

2014 ◽  
Vol 675-677 ◽  
pp. 299-304
Author(s):  
Ren Jun Liang ◽  
Xiao Tian Ma ◽  
Ji Cai Qiu
Keyword(s):  
Heavy Metals ◽  
Ecological Risk ◽  
Surface Sediments ◽  
Speciation Analysis ◽  
Distribution Characteristics ◽  
Significant Toxicity ◽  
Specific Setting ◽  
Toxicity Level ◽  
The Individual ◽  
Morphological Distribution

This study assessed the ecological risk associated with heavy metals in surface sediments in a specific setting: the Wuhan wetland. Metals were extracted and characterized using the Tessier method, and the morphological distribution characteristics and correlation of Zn, Mn, Fe, Cr, and As were analyzed. The results indicated that heavy metals at the study site mainly exist in residual state forms; the Mn pollution was serious; the potential risk from Cr and As was larger; and the environmental risk from Fe and Zn was lower. In order of potential ecological harm: As > Zn > Cr > Mn. The overall risk of ecological harm was slight, but the individual region has seen moderate ecological damage because of As pollution. Because this element has a significant toxicity level, it is important to remain attentive to the pollution caused by it.

Influence of Decreasing Supplementation to Transformation of Chemical Forms of Ni, Zn and Cu During Composting of Sewage Sludge

2021 ◽  
Vol 23 ◽  
pp. 580-593
Author(s):  
Robert Sidełko
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Organic Carbon ◽  
Ion Exchange ◽  
Beneficial Effect ◽  
Sequential Extraction ◽  
Nitrogen Concentration ◽  
Chemical Forms ◽  
N Value ◽  
Mobile Forms

This paper pertains to the influence of decreasing supplementation to transformation of chemical forms of Ni. Zn and Cu during composting of sewage sludge. A universally used supplementing material constituting a rich source of organic carbon is straw. Addition of straw to sewage sludge is aimed at increasing C/N proportion up to at least 15 due to the risk of formation of toxic forms of nitrogen, concentration of which in sewage sludge is exceptionally high. We have presented in this paper the results of speciation research of three elements applying Tessier’s sequential extraction. It’s been proven that decreasing of straw share in the composted mixture with sewage sludge down to the level of C/N value below the admissible value, has a beneficial effect on the allocation of tested heavy metals towards the forms that are permanently bound in compost matrix. A systematic increase of organic (IV) and residual (V) fractions share and decrease of mobile forms of heavy metals content in bioavailable fractions i.e. ion-exchange (I) and carbonate (II) has been ascertained.

Adsorption and redox reactions of heavy metals on synthesized Mn oxide minerals

2007 ◽  
Vol 147 (2) ◽  
pp. 366-373 ◽  
Author(s):  
Xiong Han Feng ◽  
Li Mei Zhai ◽  
Wen Feng Tan ◽  
Fan Liu ◽  
Ji Zheng He
Keyword(s):  
Heavy Metals ◽  
Redox Reactions ◽  
Mn Oxide ◽  
Oxide Minerals
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