Lead zinc slag-based geopolymer: Demonstration of heavy metal solidification mechanism from the new perspectives of electronegativity and ion potential

2021 ◽  
pp. 118509
Author(s):  
Qiushi Zhang ◽  
Xing Cao ◽  
Shichang Sun ◽  
Weichen Yang ◽  
Lin Fang ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Solidification ◽  
Lead Zinc ◽  
Solidification Mechanism

Heavy metal speciation in waters, sediments and biota from Lake Macquarie, New South Wales

1987 ◽  
Vol 38 (5) ◽  
pp. 591 ◽  
Author(s):  
GE Batley
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Surface Sediments ◽  
Metal Speciation ◽  
New South ◽  
New South Wales ◽  
Contaminated Sediments ◽  
Zinc Smelter ◽  
South Wales ◽  
Lead Zinc

The distribution and bioavailability of heavy metals in waters and sediments from Lake Macquarie (N.S.W.) have been examined. Elevated concentrations of zinc, lead, cadmium and copper detected in surface sediments and waters from the northern end of the lake are attributable to discharges from a lead-zinc smelter on Cockle Creek. The majority of the metals are in bioavailable forms and are shown to be accumulated in seagrasses, seaweeds and bivalves. Calculations indicate that, at the current rates of discharge, the concentrations of bioavailable metals in newly-deposited sediments should not be deleterious. Elutriate tests showed that there will be no significant mobilization of metals during dredging operations to remove the contaminated sediments.

scholarly journals Physico-chemical properties and heavy metal contents of a tropical estuarine ecosystem, Nigeria

2018 ◽  
Vol 5 (11) ◽  
pp. 781-797
Author(s):  
Paul Chinedu Echi ◽  
Daberechi Ndudim Okpechi ◽  
Janet Azu Urum ◽  
Izuchukwu Samson Arukwe
Keyword(s):  
Heavy Metal ◽  
Chemical Properties ◽  
Oxygen Demand ◽  
International Standards ◽  
Anthropogenic Pressure ◽  
Estuarine Ecosystem ◽  
Metal Concentrations ◽  
Metal Contents ◽  
Zinc Cadmium ◽  
Lead Zinc

Ibaka Estuarine in Mbo, Nigeria, has little or no information on its basic properties, therefore its water samples were studied from March to June 2018 in three different stations and compared with International Standards to evaluate its physic-chemical properties as well as heavy metal contents. The physic-chemical properties studied include pH, salinity (g/L), EC (μs/cm), turbidity (NTU), total suspended solids (mg/L), total dissolved solids (mg/L), dissolved oxygen (mg/L), BOD5 (mg/L), and chemical oxygen demand (mg/L). In addition, some metal concentrations of manganese, iron, copper, lead, zinc, cadmium, chloride and magnesium were determined by atomic absorption spectroscopy (AAS). The range of metal concentrations manganese (0.08-0.12 mg/L), copper (0.05-0.09 mg/L), lead (0.01-0.03 mg/L), iron (1.86-4.66 mg/L), zinc (0.68-1.16 mg/L), cadmium (0.04-0.08 mg/L), chloride (675.0-791.25 mg/L), magnesium (10.66-14.30 mg/L). The study infers that anthropogenic pressure plays damaging role to its properties in addition to general health implication of high values for Fe, Zn, Cd, Cl and Mg which exceeded international standard.

scholarly journals Limits of seed germination of phytomeliorants under conditions of heavy metals toxic concentrations

2019 ◽  
Vol 8 (1) ◽  
pp. 82-86
Author(s):  
Anastasia Olegovna Oznobihina
Keyword(s):  
Heavy Metal ◽  
Contaminated Soils ◽  
Experimental Studies ◽  
Threshold Concentration ◽  
Leguminous Plant ◽  
Critical Threshold ◽  
Toxic Agent ◽  
Germination Energy ◽  
Lead Zinc ◽  
The Impact

The aim of the study is to conduct biological testing at the initial stages of plant objects viability in the model conditions of heavy metal pollution. The paper presents the results of laboratory experiments to assess the impact of different concentrations of heavy metal salts on the viability of yellow melilot and great trefoil seeds. In the course of the conducted experimental studies the author has been established a direct dependence of the decrease in the indices of germination energy and laboratory germination of seeds with an increase in the concentration of phytotoxicant salts, determined the critical (threshold) concentration of the studied elements and the metal content, in which the processes of growth and development of seeds remain. The concentration of 0,01% cadmium, zinc, lead and copper was optimal for germination of melilot seeds, where germination was equal to 80%, 74%, 69% and 64%, respectively. For great trefoil seeds, high germination rates were noted in case of 0,01% contamination with lead, zinc, cadmium and copper - 82%, 80%, 77% and 76%, respectively, and in 0,1% salt solution of lead, copper and zinc there were recorded 75%, 74% and 72% of seedlings. Zinc in the concentration of 0,01% at the initial stages of germination of phytomeliorant seeds stimulated germination energy. The tendency of resistance to pollution by lead, zinc and copper was observed at sprouts of a great trefoil, and to pollution by cadmium the greatest resistance was shown by a melilot yellow. Defining the limits of the leguminous plant seeds germination in the presence of a toxic agent will allow research and development in respect of biological restoration of contaminated soils and can be used in technologically disturbed lands.

scholarly journals Mobility of lead, zinc and cadmium in alluvial soils heavily polluted by smelting industry

2011 ◽  
Vol 51 (No, 7) ◽  
pp. 316-321 ◽  
Author(s):  
A. Vaněk ◽  
L. Borůvka ◽  
O. Drábek ◽  
M. Mihaljevič ◽  
M. Komárek
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Czech Republic ◽  
Extraction Procedure ◽  
Metal Mobility ◽  
Alluvial Soils ◽  
Mobility Factor ◽  
Heavy Metal Mobility ◽  
Profile Distribution ◽  
Lead Zinc

In order to determine the mobility of Pb, Zn and Cd in soils from the Př&iacute;bram region (Czech Republic) heavily contaminated by metallurgy, two profiles of alluvial soils were closely studied. Total contents of heavy metals were determined after digestion with a mixture of HF and HClO<sub>4</sub>. Heavy metal mobility was assessed using the mobility factor (MF) that represents the proportion of heavy metals present in the exchangeable and carbonate bound fraction based on the Tessier&rsquo;s sequential extraction procedure. The MF ranged from 2 to 46% for lead, 19 to 62% for zinc and 61 to 94% for cadmium. The profile distribution of zinc and cadmium showed a variable development with depth, which is caused by high amounts of these metals present in labile forms. The profile distribution of lead (the least mobile metal) is characterized by a gradual decrease with depth. The results indicate a higher contamination of the soil profile situated 2.5 km away from the smelter in comparison with the profile in its close vicinity. This fact confirms the existence of extreme fluvial contamination.

Phyto- and zooplankton in fishponds contaminated with heavy metal runoff from a lead-zinc mine

2011 ◽  
Vol 40 (4) ◽  
Author(s):  
Elżbieta Wilk-Woźniak ◽  
Agnieszka Pociecha ◽  
Dariusz Ciszewski ◽  
Urszula Aleksander-Kwaterczak ◽  
Edward Walusiak
Keyword(s):  
Heavy Metal ◽  
Metal Contamination ◽  
Heavy Metal Contamination ◽  
Zooplankton Species ◽  
Mine Waters ◽  
Lead And Zinc ◽  
Lead Zinc ◽  
Zinc Mine ◽  
Lead And Zinc Mine ◽  
Planktonic Communities

AbstractThis investigation focused on plankton inhabiting fishponds, which previously received mine waters from the lead-zinc mine ‘Matylda’, located in southern Poland (Upper Silesia). The purpose of the investigation was to study the effects of chronic and persistent contamination of fishpond bottom sediments with heavy metals originated from the lead and zinc mine. The phyto-and zooplankton in the four fishponds were dominated by diatoms, green algae and rotifers. Plankton composition of the reference non-contaminated pond was different, since Chrysophytes dominated, and Copepoda were the most numerous among zooplankton. In the contaminated fishponds, we observed teratological forms, both for phyto-and zooplankton species, but only as individuals. Our results showed that planktonic communities had adapted to chronic and persistent heavy metal contamination.

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