Mobility of potentially toxic elements in family garden soils of the Riotinto mining area

2021 ◽  
Author(s):  
Antonio Romero-Baena ◽  
Cinta Barba-Brioso ◽  
Alicia Ross ◽  
Isabel González
Keyword(s):  
Organic Matter ◽  
Toxic Elements ◽  
Agricultural Soils ◽  
Clay Mineralogy ◽  
Mining Area ◽  
Potentially Toxic Elements ◽  
Water Soluble ◽  
Trophic Chain ◽  
Mining Areas ◽  
Total Concentrations

<p>Agricultural soils in mining areas usually accumulate potentially toxic elements (PTEs) that can become a health risk to humans by entering the trophic chain. In this study, five small agricultural plots close to Riotinto mines (SW Spain) were studied, with the aims of comparing the concentration of PTEs with respect to the regional (South Portuguese Zone) baseline and conducting availability studies in order to determine the contamination of soils. Chemical composition, total and clay mineralogy, and edaphic parameters were determined in topsoil and subsoil samples to characterize the soils, and single extractions were conducted to assess the mobility. The mineralogy of the soils was composed of quartz and phyllosilicates, with small amounts of feldspars and occasionally containing hematite and calcite. The texture ranged from sandy to silty loam, the pH was slightly acidic, and high contents of organic matter were found. Total concentrations of trace elements correlated with the texture, the content in iron oxy-hydroxides and the pH. The values of As, Pb, Cu, and Zn exceeded the regional baseline even in sites unaffected by mining. The results suggest that a widespread sampling is necessary to determine the local background. The most water-soluble element was As, due to the competition of organic matter for sorption sites. The content of Cu, Cr and Zn extracted with different methods were higher in sandy soils with low iron oxy-hydroxides content. Monoammonium phosphate and EDTA extractions seemed to remove elements from organic matter and iron oxy-hydroxides. The extracted fractions of As and metals reached up to 10-30 wt%.  Despite the high total concentrations of the element in soils, they generally showed low available proportions, especially with water and ammonium acetate extractants. The results suggest that the soils are not necessarily a risk to humans and higher investigation efforts are necessary to assess the availability of PTEs and their transfer to plants.</p>

Natural organic matter from the dispersion train of gold sulfide tailings: group composition and fractionation of elements: case study of Ursk tailings, Kemerovo region, Siberia

2020 ◽  
pp. geochem2020-052
Author(s):  
I.N. Myagkaya ◽  
B.Yu. Saryg-ool ◽  
Oleg N. Surkov ◽  
S.M. Zhmodik ◽  
E.V. Lazareva ◽  
...  
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Humic Acids ◽  
Toxic Elements ◽  
Group Composition ◽  
Soluble Fraction ◽  
Potentially Toxic Elements ◽  
Water Soluble ◽  
Water Soluble Fraction ◽  
Sulfide Tailings

We study the contents of elements and group composition in natural organic matter (NOM) that interacts with acid mine drainage (АMD) and high-sulfide tailings at the Ursk site (Southwestern Siberia, Russia). AMD causes biomass changes in NOM, related changes in the composition of fractions, and hydrolysis of hydrolyzable compounds; it increases the water-soluble fraction and maintains depolymerization of humic acids to fulvic acids, but exerts no effect on substances soluble in organics (bitumen) and on poorly hydrolyzable compounds. Accumulation of inorganic elements and precipitation of minerals obscure the true fraction composition of NOM: the superposed mineral component contributes significantly to the water-soluble, humic acid, hydrolyzable, and non-hydrolyzable fractions, and may reach 26.4 % per total of all fractions. Rock-forming and potentially toxic elements partition among NOM fractions and predominate in the water-soluble fraction. The contents of Au and Ag are the highest in the fractions of humic acids and hydrolyzable compounds but are lower in the non-hydrolyzable residue. The obtained data have implications for possible migration of potentially toxic elements and noble metals and thus for remediation of polluted areas. The observed fractionation of Ag and Au in NOM helps understand the mechanisms of their distribution in organic-bearing environments, such as peatlands or coal basins.

scholarly journals Level, Source, and Spatial Distribution of Potentially Toxic Elements in Agricultural Soil of Typical Mining Areas in Xiangjiang River Basin, Hunan Province

2020 ◽  
Vol 17 (16) ◽  
pp. 5793
Author(s):  
Yang Yu ◽  
Haijiang Luo ◽  
Lihuan He ◽  
Wenqing Liu ◽  
Renji Xu ◽  
...  
Keyword(s):  
Toxic Elements ◽  
Pollution Index ◽  
Principal Component ◽  
Potentially Toxic Elements ◽  
Water Soluble ◽  
Hunan Province ◽  
Anthropogenic Sources ◽  
Xiangjiang River ◽  
Mining Areas ◽  
Chemical Availability

The concentrations, chemical availability, distribution, and sources of potentially toxic elements (PTEs) in the soil of Xiangjiang Basin in Hunan Province, China were investigated at 85 sites. The highest mean concentrations of Cd, Cu, Zn, As, and Pb were observed in Hengyang, whereas those for Mn, Co, and Hg were observed in Changde. The pollution index values followed the order: Cd > Hg > Cu > Zn > As > Pb; the mean geo-accumulation index values were in the order: Cd > Hg > Pb > Cu > Zn > As > Co > Mn. Cd was associated with moderate contaminated level, Hg and Pb were associated with moderate contaminated to uncontaminated level, and Cu, Zn, As, Co, and Mn were associated with uncontaminated level of pollution. Furthermore, 64.5% of Cd was water-soluble and exhibited exchangeable fractions; its chemical availability posed a risk to the ecosystem. Spatial analysis, principal component analysis, and a positive matrix factorization model were used to assess the PTE sources. Four principal components contributed to 88.8% of the 8 PTEs concentrations. Mining, smelting, industrial, and agricultural activities, alongside sewage irrigation, the use of agrochemicals, and vehicular emissions are the possible anthropogenic sources that pollute agricultural products and threaten human health in the Xiangjiang Basin.

scholarly journals Assessing the Risk of Total and Available Potentially Toxic Elements in Agricultural Soil in Typical Mining Areas in Xiangjiang River Basin, Hunan Province

Minerals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 953
Author(s):  
Yang Yu ◽  
Wenqing Liu ◽  
Haijiang Luo ◽  
Lihuan He ◽  
Haijiang Liu ◽  
...  
Keyword(s):  
Toxic Elements ◽  
Potentially Toxic Elements ◽  
Hunan Province ◽  
World Health ◽  
Distribution Data ◽  
Xiangjiang River ◽  
Mining Areas ◽  
Rice Samples ◽  
Health Organization ◽  
Total Concentrations

In this study, soil and rice samples from 85 sites in six cities in Hunan Province were analyzed for Cu, Zn, Pb, Cd, Hg, Mn, and Co (total and bioavailable concentrations for soil) in July 2014. The results indicated that the total concentrations of Cu, Zn, Pb, Cd, and Hg in soil had increased significantly compared with the 1980s, and were correlated with their bioavailable concentrations in soil positively. The total concentrations of Cd and Co in soil were correlated with those in rice. Bioavailable concentrations of Cd, Mn, Co, Pb, and Cu represented 64.4%, 33.2%, 12.0%, 11.6%, and 6.1% of the total soil concentrations, respectively. The bioavailable concentrations of Cd and Co in soil had a extremely significant (p < 0.01) positive correlation with those in rice, suggesting that bioavailable concentrations was a better indicator for soil potentially toxic elements contamination. The pH values had a significant influence on the bioavailability of Cd and Cu and the amounts taken up by rice. The Cd contamination in 27.0% rice samples exceeded World Health Organization recommended thresholds. The results added basic pollution distribution data, further revealing the relationships of metals in soil and crops and would offer great help to the metallic pollution control in these areas.

Redistribution and speciation of elements in gold-bearing sulfide mine tailings interbedded with natural organic matter: case study of Novo-Ursk deposit, Kemerovo Region, Siberia

2019 ◽  
Vol 20 (3) ◽  
pp. 323-336
Author(s):  
Bagai-ool Yu Saryg-ool ◽  
I. N. Myagkaya ◽  
I. S. Kirichenko ◽  
M. A. Gustaytis ◽  
O. V. Shuvaeva ◽  
...  
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Organic Material ◽  
Toxic Elements ◽  
Mine Drainage ◽  
Potentially Toxic Elements ◽  
Water Soluble ◽  
New Mineral ◽  
Secondary Enrichment ◽  
Gold Bearing

The paper presents data on two cores from the dispersion train of gold-bearing sulfide tailings in the Novo-Ursk deposit (Kemerovo region, Russia), where organic-bearing mud and natural organic matter are interbedded with cyanide tailings and acid mine drainage (AMD). The study focuses on speciation of Au, Ag and potentially toxic elements (PTE), including Fe, Cu, Zn, As, Se and Pb according to selective sequential extractions. Since large contents of elements are found in water solution and bound to Fe(III) compounds, sulfides and/or organic matter in both cores, the organic material behaves as a natural biogeochemical barrier for potentially toxic elements and precious metals released from AMD. The interaction with organic matter results in biogeochemical sorption and immobilization of elements and is favourable for secondary enrichment in gold and silver. It leads to immobilization of elements that further form new mineral phases or become partitioned between existing phases. On the other hand, very high concentrations of water-soluble and oxidizable species of PTE and Au, which are unstable in surface conditions and may become remobilized when the environment changes, make the organic material less workable and even potentially hazardous. Thus, both positive (secondary enrichment) and negative (pollution) effects should be taken into account in the planning and design of systems for purification, disposal of cyanide tailings and recovery of useful components from tailings using natural organic matter as a geochemical barrier.

Accumulation of Potentially Toxic Elements in Agricultural Soils

2021 ◽  
pp. 87-108
Author(s):  
Iain Green ◽  
Tilak Ginige ◽  
Merve Demir ◽  
Patrick Van Calster
Keyword(s):  
Toxic Elements ◽  
Agricultural Soils ◽  
Potentially Toxic Elements

Water-soluble fraction of mercury, arsenic and other potentially toxic elements in highly contaminated sediments and soils

Chemosphere ◽  
2010 ◽  
Vol 78 (11) ◽  
pp. 1301-1312 ◽  
Author(s):  
S.M. Rodrigues ◽  
B. Henriques ◽  
J. Coimbra ◽  
E. Ferreira da Silva ◽  
M.E. Pereira ◽  
...  
Keyword(s):  
Toxic Elements ◽  
Soluble Fraction ◽  
Contaminated Sediments ◽  
Potentially Toxic Elements ◽  
Water Soluble ◽  
Water Soluble Fraction

The forms of potassium and potassium adsorption in some virgin soils from south-western Australia

Soil Research ◽  
1999 ◽  
Vol 37 (4) ◽  
pp. 695 ◽  
Author(s):  
Y. Pal ◽  
R. J. Gilkes ◽  
M. T. F. Wong
Keyword(s):  
Western Australia ◽  
Agricultural Soils ◽  
Clay Mineralogy ◽  
Sorption Isotherms ◽  
Clay Content ◽  
Water Soluble ◽  
X Ray Diffraction ◽  
Exchangeable K ◽  
The North ◽  
Southern District

This investigation was undertaken to determine the potassium (K) status and adsorption behaviour of 227 samples from horizons of 41 representative virgin soil profiles, extending from Geraldton in the north to the Great Southern district of Western Australia. X-ray diffraction analysis of random powder of whole soil indicated that quartz is the dominant mineral and some soils contain significant amounts of feldspars. Clay mineralogy is dominated by kaolinite but minor quantities of illite are present in some soils. Most south-west Australian agricultural soils contain little available K: NaHCO3-extractable K (NaHCO3-K, median value 0·09 cmol K/kg, equivalent to 35 mg K/kg soil), HNO3-extractable K (HNO3-K, median value 0·30 cmol K/kg, equivalent to 117 mg K/kg soil), and total K (XRF determined K, median value, 17 cmol K/kg, equivalent to 6630 mg K/kg soil). The proportion of water-soluble K (H2O-K) ranges from 0 to 3·5% of total K, 0 to 76% of HNO3-K, and 0 to nearly 100% of exchangeable K. Exchangeable K ranges from 0 to 100% (median value 37%) of HNO3-K. These are relatively high proportions of H2O-K and exchangeable K compared with soils from many other parts of the world. The amounts of all forms of K variously increase or decrease downwards in the soil profile depending on both clay content and mineralogy. The commonly assumed increase in K with clay content alone is invalid. The soils mostly have low-to-moderate values of K sorption capacity, ranging from 5% to 67% (median value 14%) of added K (initially 4·1 mM K/L, equivalent to 4·1 cmol K/kg). otassium sorption isotherms conform well to the Freundlich equation. The inability of the Langmuir equation to describe the data may indicate that there are several types of K sorption sites in these soils. The Gapon coefficient KG varied widely from 0·04 to 29·8 (L/mol) ½ [median value 5·4 (L/mol) ½ ].

Human health risks from potentially toxic elements in soils of coal mining area

2022 ◽  
pp. 129-139
Author(s):  
R.E. Masto ◽  
J. George ◽  
V.A. Selvi ◽  
R.C. Tripathi ◽  
N.K. Srivastava
Keyword(s):  
Human Health ◽  
Coal Mining ◽  
Health Risks ◽  
Toxic Elements ◽  
Mining Area ◽  
Potentially Toxic Elements ◽  
Coal Mining Area ◽  
Human Health Risks

Potentially toxic elements in agricultural soils from the Lombardia region of northern Italy

2018 ◽  
Vol 190 ◽  
pp. 436-452 ◽  
Author(s):  
Gian Maria Beone ◽  
Franca Carini ◽  
Laura Guidotti ◽  
Riccardo Rossi ◽  
Marina Gatti ◽  
...  
Keyword(s):  
Toxic Elements ◽  
Agricultural Soils ◽  
Northern Italy ◽  
Potentially Toxic Elements
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