scholarly journals Evaluation of Heavy Metals Concentration and Sequential Extraction in Zahedan Compost

2016 ◽  
Vol 3 (2) ◽  
pp. 81-92
Author(s):  
Safoora Javan ◽  
Moslem Didehvar ◽  
Rahimbakhsh Raisi ◽  
Mohammad Abasiyan ◽  
Somaye Ahmadi ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Sequential Extraction

scholarly journals An Assessment of Heavy Metal Contamination in the Nakdong River Around the Weir

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 684
Author(s):  
Hee Won Son ◽  
Sun Hee Shim ◽  
Haeseong Oh ◽  
Jung Hyun Choi
Keyword(s):  
Heavy Metals ◽  
Sequential Extraction ◽  
Environmental Protection Agency ◽  
Heavy Metal Contamination ◽  
Environmental Research ◽  
Residual Fraction ◽  
Nakdong River ◽  
Risk Assessment Code ◽  
The Nakdong River ◽  
Reducible Fraction

In this study, the concentrations and characteristics of copper (Cu), zinc (Zn), and lead (Pb) contamination in sediment samples were investigated using aqua regia extraction and Tessier’s five-step sequential extraction. Based on the concentration of metals, the influence of the Hapcheon-Changnyeong weir on sediments in the Nakdong River was assessed. The origins of the contaminants, their bioavailability, and their mobility were determined using sequential extraction. Greater concentrations of heavy metals were found in samples collected closer to the weir. The largest proportion of Cu was identified in the residual fraction based on sequential extraction, whereas Zn was predominantly found in the reducible fraction. Iron-manganese in the reducible fraction of Zn has the potential to leach back to the water body. In addition, the combined concentration of fractions 1 and 2 of Cu comprised more than 20% of total amount that still has potential to affect the water quality. The results of this study were compared with existing sediment standards set out by the NIER (National Institute of Environmental Research), Canada, and US EPA (United States Environmental Protection Agency) guidelines, as well as the risk assessment code (RAC). The concentrations of heavy metals exceeded the standards set by the Canadian guideline by up to four times in particular samples, highlighting the need for continual monitoring.

Research on the Morphological of Lead and Zinc in the Smelting Slag

2015 ◽  
Vol 1088 ◽  
pp. 200-205
Author(s):  
Lin Yu ◽  
Dong Wei Li
Keyword(s):  
Heavy Metals ◽  
Sequential Extraction ◽  
Ecological Risk ◽  
Total Content ◽  
Residual Fraction ◽  
Bcr Sequential Extraction ◽  
Lead And Zinc ◽  
Smelting Slag ◽  
Reducible Fraction

In this paper analysed the forms of heavy metals (Zn Pb Cd and As) of the Smelting Slag for Lead and Zinc,using BCR sequential extraction. Different chemical morphological of heavy metals have different activity and harmfulness. Migration and Utilization of heavy metals were decided by the existent form of heavy metals in the soil,which influenced Bioactivity and Toxicity. The results show that the main forms of Zn and Cd are Oxidizable and Residual fraction, and Pb mainly occurred in Oxidizable and Reducible fraction. however, As mainly occurred in Residual fraction, which the percentage of reachs 99.56%. According to the percentage of fractions extracted in total content (As is 0.44%, Zn is 14.7%, Pb is 85.98%, Cd is 48.86%),the latent ecological risk of heavy metals varied in the descending order of,Pb Cd Zn and As.

Sequential extraction of heavy metals in soils from a copper mine: Distribution in geochemical fractions

Geoderma ◽  
2014 ◽  
Vol 230-231 ◽  
pp. 108-118 ◽  
Author(s):  
D. Arenas-Lago ◽  
M.L. Andrade ◽  
M. Lago-Vila ◽  
A. Rodríguez-Seijo ◽  
F.A. Vega
Keyword(s):  
Heavy Metals ◽  
Sequential Extraction ◽  
Copper Mine ◽  
Geochemical Fractions ◽  
Heavy Metals In Soils

Sequential extraction of anaerobic digestate sludge for the determination of partitioning of heavy metals

2014 ◽  
Vol 102 ◽  
pp. 18-24 ◽  
Author(s):  
Neng-min Zhu ◽  
Qiang-Li ◽  
Xu-jing Guo ◽  
Hui-Zhang ◽  
Yu-Deng
Keyword(s):  
Heavy Metals ◽  
Sequential Extraction ◽  
Anaerobic Digestate

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 Sequential extraction and risk assessment of pollutants from one major tributary of the Ganga

2021 ◽  
Author(s):  
Vinay Kumar ◽  
Pokhraj Sahu ◽  
Markandeya
Keyword(s):  
Heavy Metals ◽  
Risk Assessment ◽  
High Risk ◽  
Sequential Extraction ◽  
Hierarchical Cluster ◽  
Residual Fraction ◽  
Toxic Heavy Metals ◽  
Risk Assessment Code ◽  
Bed Sediments ◽  
Gomti River

Abstract The geochemical fractionation of toxic heavy metals Cd, Pb, Cr, Co, Mn, Ni, Cu, Fe and Zn was investigated in 10 different sites of river bed sediments (up, mid and downstream) of Gomti River at Lucknow city. Sequential extraction technique was used to identify the distribution of trace elements binding in different fractions i.e., exchangeable, carbonate, Fe and Mn oxide, organic matter and residual. Heavy metal concentrations were least at upstream and significantly higher in mid and downstream. Fractionation indicated that dominant metals were bound in residual fraction to the bed sediments except for Cd and Pb which were bound in an equivalent fraction. Geo-accumulation index factor reveals that the enrichment of heavy metals in the bio-available fraction is contributed anthropogenically. Hierarchical cluster analysis also shows the metal pollution load in the river. Risk assessment code of Cd and Ni showed very high risk (ranged from 54.41 to 85.56 and 20.57 to 44.92 respectively) followed by Pb (high risk), Zn, Co (medium risk), Cr, Mn, Cu, Fe (low risk) in Gomti River water. Further, concentrations of Cd and Pb at mid Lucknow were 31 and 75%, high enough to pose a substantial risk to the environment.

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.

Sign in / Sign up

Export Citation Format

Share Document