Integrated Assessment of Affinity to Chemical Fractions and Environmental Pollution with Heavy Metals: A New Approach Based on Sequential Extraction Results

To assess the affinity degree of heavy metals (HMs) to geochemical phases, many indices with several limitations are used. Thus, this study aims to develop a new complex index for assessing contamination level and affinity to chemical fractions in various solid environmental media. For this, a new integrated approach using the chemical affinity index (CAF) is proposed. Comparison of CAF with %F on the literature examples on fractionation of HMs from soils, bottom sediments, atmospheric PM10, and various particle size fractions of road dust proved a less significant role of the residual HMs fraction and a greater contribution of the rest of the chemical fractions in the pollution of all studied environments. This fact is due to the normalization relative to the global geochemical reference standard, calculations of contribution of an individual element to the total pollution by all studied HMs, and contribution of the particular chemical fraction to the total HMs content taken into account in CAF. The CAF index also shows a more significant role in pollution and chemical affinity of mobile and potentially mobile forms of HMs. The strong point of CAF is the stability of the obtained HM series according to the degree of chemical affinity and contamination. Future empirical studies are necessary for the more precise assessment of CAF taking into account the spatial distribution of HMs content, geographic conditions, geochemical factors, the intensity of anthropogenic impact, environmental parameters (temperature, humidity, precipitation, pH value, the content of organic matter, electrical conductivity, particle size distribution, etc.). The combined use of CAF along with other indices allows a more detailed assessment of the strength of HMs binding to chemical phases, which is crucial for understanding the HMs’ fate in the environment.

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Storage Problems of Poplar Chips from Short Rotation Plantations with Special Emphasis on Fungal Development

Acta Silvatica et Lignaria Hungarica ◽

10.2478/v10303-012-0010-7 ◽

2012 ◽

Vol 8 (1) ◽

pp. 123-132 ◽

Cited By ~ 9

Author(s):

Zsuzsanna Horváth ◽

Béla Marosvölgyi ◽

Christine Idler ◽

Ralf Pecenka ◽

Hannes Lenz

Keyword(s):

Particle Size ◽

Health Risk ◽

Dry Matter ◽

Ph Value ◽

Wood Chips ◽

Raw Material ◽

Special Focus ◽

Fungal Development ◽

Short Rotation ◽

Fungal Particles

Abstract - There are several problems in storing wood chips freshly harvested from short rotation plantations, which result in quality losses as well as in dry matter and energy losses. The factors influencing the degradation of raw material are examined in this paper with special focus on fungal development. An excessive growth of fungi is connected to dry matter losses and also to an increased health risk during raw material handling. The following factors were measured during 6 months storage of poplar wood chips depending on particle size: box temperature, moisture content, pH-value, appearance of fungi in the storage and the concentration of fungal particles in the air. The results show a close connection between particle size, temperature and attack of fungi. During the storage mesophilic and termophilic species of the genera Alternaria, Aspergillus, Cladosporium, Mucor and Penicillium appeared. The concentration of fungal particles is the highest for fine chips and decreases in bigger particles. There was a special focus on the investigation of the properties of coarse chips (G 50), which represent a good compromise between handling, storage losses and health risk due to fungal development.

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Particle-size distribution and heavy metals accumulation in soils of Rostov-on-Don

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/368/1/012009 ◽

2019 ◽

Vol 368 ◽

pp. 012009

Author(s):

O S Bezuglova ◽

S N Gorbov ◽

A A Okolelova ◽

N V Salnik ◽

S S Tagiverdiev ◽

...

Keyword(s):

Heavy Metals ◽

Particle Size ◽

Particle Size Distribution ◽

Size Distribution ◽

Heavy Metals Accumulation ◽

Metals Accumulation

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Distribution of heavy metals and metalloids in bulk and particle size fractions of soils from coal-mine brownfield and implications on human health

Chemosphere ◽

10.1016/j.chemosphere.2017.01.021 ◽

2017 ◽

Vol 172 ◽

pp. 505-515 ◽

Cited By ~ 50

Author(s):

Hongxia Li ◽

Hongbing Ji ◽

Chunjing Shi ◽

Yang Gao ◽

Yan Zhang ◽

...

Keyword(s):

Heavy Metals ◽

Particle Size ◽

Human Health ◽

Coal Mine ◽

Metals And Metalloids ◽

Size Fractions ◽

Particle Size Fractions ◽

Heavy Metals And Metalloids

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Screening and Desilication of a Silicate Bacteria

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.236-238.253 ◽

2011 ◽

Vol 236-238 ◽

pp. 253-257

Author(s):

Xian Zhen Zhang ◽

De Si Sun ◽

Hai Lin

Keyword(s):

Particle Size ◽

Incubation Time ◽

Ph Value ◽

Solution Temperature ◽

Optimum Conditions ◽

Initial Ph ◽

Silicate Bacteria ◽

Bauxite Ore

The strain Jgj-1 was isolated from Gaoan bauxite ore. The relations of desilication of the strain Jgj-1 and the pH of solution, temperature, shaking speed, incubation time, particle size were investigated. The results shows the optimum conditions of bioleaching are as following: at 28°C, initial pH value is 7.2, particle size 0.056mm, 200rpm shaking speed, incubation 5-7 days.

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Dynamic behavior of suspended pollutants and particle size distribution in highway runoff

Water Science & Technology ◽

10.2166/wst.2002.0771 ◽

2002 ◽

Vol 46 (11-12) ◽

pp. 413-418 ◽

Cited By ~ 104

Author(s):

H. Furumai ◽

H. Balmer ◽

M. Boller

Keyword(s):

Heavy Metals ◽

Particle Size ◽

Particle Size Distribution ◽

Size Distribution ◽

Suspended Solids ◽

Dynamic Change ◽

First Flush ◽

Highway Runoff ◽

Runoff Rate ◽

Highway Drainage

Continuous runoff quality monitoring was conducted for one month at urban highway drainage with an area of 8.4 ha. Dynamic change of suspended solids and heavy metal concentrations were investigated during first flush periods, taking the particle size distribution into consideration. Except for Pb, the concentrations of TSS and heavy metals in runoff were within the range of the EMC reported in recent highway runoff research. Particle-bound heavy metals (Zn, Pb, and Cu) accounted for more significant pollutant loads than soluble fractions. Their content decreased with increasing total SS concentration in runoff samples. The results of particle size distribution (PSD) analysis of runoff samples indicate that high TSS concentration samples contained coarser particles. Based on the PSD results, a stepwise wash-off phenomenon of TSS under varying runoff rate conditions was explained by the different washoff behavior of fine (< 20 mm) and coarser particles.

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Optimization of pH, temperature and carbon source for bioleaching of heavy metals by Aspergillus flavus isolated from contaminated soil

Main Group Metal Chemistry ◽

10.1515/mgmc-2018-0038 ◽

2019 ◽

Vol 42 (1) ◽

pp. 1-7 ◽

Cited By ~ 2

Author(s):

Sadia Qayyum ◽

Ke Meng ◽

Sidra Pervez ◽

Faiza Nawaz ◽

Changsheng Peng

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Aspergillus Flavus ◽

Contaminated Soil ◽

Ph Value ◽

Optimal Conditions ◽

Batch Experiments ◽

Molecular Biological Analysis ◽

One Step ◽

Industrial Mining

Abstract Soil contamination with heavy metal content is a growing concern throughout the world as a result of industrial, mining, agricultural and domestic activities. Fungi are the most common and efficient group of heavy metal resistant microbe family which have potential for metal bioleaching. The use of filamentous fungi in bioleaching of heavy metals from contaminated soil has been developed recently. The current study intends to isolate a strain with the ability to degrade the pH value of the liquid medium. Identification results based on morphological and molecular biological analysis gave a 98% match to Aspergillus flavus. Batch experiments were conducted to select the optimal conditions for bioleaching process which indicated that 130 mg/ L sucrose, neutral pH and temperature of 30°C were more suitable during 15-day bioleaching experiments using A. flavus. In one-step bioleaching, the bioleaching efficiencies were 18.16% for Pb, 39.77% for Cd and 58.22% for Zn+2, while two-step bioleaching showed efficiencies of 16.91% for Pb, 49.66% for Cd and 65.73% for Zn+2. Overall, this study indicates that bioleaching of heavy metals in contaminated soil using A. flavus has the potential for contaminated soil remediation.

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Use of Municipal Solid Waste Incineration Bottom Ash in Adsorption of Heavy Metals

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.474-476.1099 ◽

2011 ◽

Vol 474-476 ◽

pp. 1099-1102

Author(s):

Hai Ying Zhang ◽

Yi Zheng ◽

Hong Tao Hu ◽

Jing Yu Qi

Keyword(s):

Heavy Metals ◽

Particle Size ◽

Municipal Solid Waste ◽

Solid Waste ◽

Residence Time ◽

Bottom Ash ◽

Waste Incineration ◽

Synthetic Wastewater ◽

High Porosity ◽

Municipal Solid Waste Incineration

Bottom ash from municipal solid waste incineration (MSWI) has been previously suggested as an adsorbent for removing heavy metals from wastewater due to its high porosity and large surface area. In this study the adsorption characteristics of heavy metals were investigated using various particle sizes of MSWI bottom ash. The adsorption experiment was conducted using synthetic wastewater containing Cu, Zn, Pb and Cd as a function of residence time, initial pH, ash dosage and particle size, respectively. The adsorption rate increased with decreasing particle size and with increasing residence time. Through the above analysis, this work proved that bottom ash was effective in adsorbing the four heavy metals.

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Contamination Level and Speciation of Heavy Metals in Sediments from Yundang Lake, Xiamen

2009 Second International Conference on Environmental and Computer Science ◽

10.1109/icecs.2009.65 ◽

2009 ◽

Author(s):

Jing Lin ◽

Minggang Cai ◽

Anxiang Qi ◽

Hongyou Hu ◽

Canrong Qiu ◽

...

Keyword(s):

Heavy Metals ◽

Contamination Level

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Study on Adsorption of Cu and Ba from Aqueous Solutions Using Nanoparticles of Origanum (OR) and Lavandula (LV)

Bioinorganic Chemistry and Applications ◽

10.1155/2018/3936178 ◽

2018 ◽

Vol 2018 ◽

pp. 1-8 ◽

Cited By ~ 7

Author(s):

Ghadah M. Al-Senani ◽

Foziah F. Al-Fawzan

Keyword(s):

Heavy Metals ◽

Particle Size ◽

Free Energy ◽

Aqueous Solutions ◽

Thermodynamic Parameters ◽

Solution Ph ◽

Environment Friendly ◽

Removal Of Heavy Metals ◽

Equilibrium Data ◽

Langmuir And Freundlich Models

Wild herbs (Origanum (OR) and Lavandula (LV)) were used as environment-friendly adsorbents in this study. The adsorbents were used for adsorption of Cu and Ba from water. The adsorption of heavy metals onto OR and LV was dependent on particle size, dose, and solution pH. The diameter of adsorbent particles was less than 282.8 nm. The adsorption follows second-order kinetics. Langmuir and Freundlich models have been applied to describe the equilibrium data, and the thermodynamic parameters, the Gibbs free energy, ∆G°, enthalpy, ∆H°, and entropy, ∆S°, have been determined. The positive value of ∆H° suggests that the adsorption of heavy metals by the wild herbs is endothermic. The negative values of ∆G° at all the studied temperatures indicate that the adsorption is a spontaneous process. It can be concluded that OR and LV are promising adsorbents for the removal of heavy metals from aqueous solutions over a range of concentrations.

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