Selenium and heavy metals content in some Mediterranean soils

Roca-Pérez, Luís; Gil, C.; Cervera, M. Luisa; Gonzálvez, Ana Bernabéu; Ramos-Miras, J.J.; Pons, Vincent; Bech, Jaume; Boluda, Rafael

doi:10.1016/j.gexplo.2010.08.004

Cited by 77 publications

(35 citation statements)

References 35 publications

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“…Heavy Metals (Cd, Cr, Cu, Zn, Mn, Pd, and Al) Although, with no statistical significance, the registered variations on Chromium, Cadmium, Copper, Nickel and Lead demonstrate an increasing tendency during the first three years of the assay, after which they decrease and stabilize. These changes in heavy metals content are in line with the consulted literature [23,40,[62][63][64][65]. Furthermore, the obtained results (low levels of heavy metals recorded and non-significant evolution of this parameter over time) were along with the expectations, considering both the characteristics of the study area (a natural landscape free of pollution incidents, with very low levels of industrialization), and the implemented cultural system in which the amount of fertilizers and phytosanitaries applied is very low [29,54].…”

Section: "Available" Phosphorus and Potassiumsupporting

confidence: 89%

Effects of the European Union Agricultural and Environmental Policies in the Sustainability of Most Common Mediterranean Soils

et al. 2017

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Agro-environmental measures promoted by the European Union focus mainly on environmental protection by maintaining sustainable levels of productivity that are adequate to the agro-ecological conditions of each region on different Member States. Among these European Union promoted measures the one known as “Extensive Forage Systems” is particularly relevant for the Mediterranean Region. In order to analyze the impact of this measure and to verify if the high expenditure of communitarian funds, with its implementation in Mediterranean soils, is aligned with the predicted benefits, a seven-year study in a southern Portugal region was conducted. In this regard, several soil chemical parameters such as organic matter, pH, electrical conductivity, “available” phosphorus, “available” potassium and heavy metal levels (Cd, Cr, Cu, Zn, Mn, Pb and Ni), were assessed, in 1329 different plots in order to represent some of the existing diversity of the Mediterranean environment, identified by the Portuguese Parcel Identification System, and considering the possibility to evaluate the evolution of these parameters on the main soil types of the region. The obtained results enabled us to verify that the application of the agro-environmental measure “Extensive Forage Systems” did not lead, during the 7 years of the study, to any significant change in terms of organic matter, soil pH and/or heavy metals content. Still it contributed for a small growth on “available” phosphorus and potassium levels and to a significant increase on Soil electrical conductivity (EC). As a final conclusion we can refer that the application of the agro-environmental measure “Extensive Forage Systems”, in soil, clime and cultural conditions prevailing in this study (Typical Mediterranean conditions from the South of Europe), did not reach its main objective, which was to increase the organic matter content in soils.

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Section: "Available" Phosphorus and Potassiumsupporting

confidence: 89%

Effects of the European Union Agricultural and Environmental Policies in the Sustainability of Most Common Mediterranean Soils

et al. 2017

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“…mainly < 0.50 mg kg -1 (Hartfiel and Bahners, 1988;Johnsson, 1992;Roca-Perez et al, 2010;De Temmerman et al, 2014;Száková et al, 2015). Total Se (aqua regia) in soils used in this study is hardly correlated to amorphous Al-(hydr)oxide content (R 2 = 0.16, p > 0.05) and weakly correlated to soil organic matter content (R 2 = 0.26, p < 0.05) and to amorphous Fe-(hydr)oxide content (R 2 = 0.51, p < 0.001).…”

Section: Total and Extractable Se Content In Soilsmentioning

confidence: 99%

“…The predominance of organic Se species in soils was also found in the studies of Yamada et al (2009) and Kang et al (1993) Finnish soils, although the exact fraction of organic Se has not been studied in these soils so far. Moreover, a positive relation between soil organic matter content and total soil Se content was observed for low Se soils from Japan, Sweden, Scotland, Spain (Mediterranean), and France with total Se content of 0.05 to 2.80 mg kg -1 and soil organic matter content of 0.12 to 36% (Johnsson, 1992;Yamada et al, 2009;Fordyce et al, 2010;Roca-Perez et al, 2010;Tolu et al, 2014), and for soils with relatively high Se from China (soil organic matter content of 0.07 to 2.4%, with an average of 0.7% and total soil Se of 0.31 to 7.65 mg kg -1 , with an average of 1.50 The total organic C was calculated from the measured soil organic matter content with an assumption that soil organic matter contains 50% organic C. ) (Xing et al, 2015). The studies of Qu et al (1997) and Zhang et al (2002) (in Chen et al (2010)) reported that Se in low Se soils in China is mainly present as Se associated with soil organic matter.…”

Section: Thementioning

confidence: 99%

“…Republic, Spain (Yläranta, 1983;Hartfiel and Bahners, 1988;Wang and Sippola, 1990;Johnsson, 1992;Adams et al, 2002;Roca-Perez et al, 2010;De Temmerman et al, 2014;Tolu et al, 2014;Száková et al, 2015) and Denmark (Hamdy and Gissel-Nielsen (1976) in Gupta and Gupta, (2000)), also have a low total Se content, i.e. mostly < 0.70 mg kg -1 .…”

Section: Introductionmentioning

confidence: 99%

“…mostly < 0.70 mg kg -1 . Some studies have shown that the major Se form in soils from Finland, France and Spain is also associated with soil organic matter (Keskinen et al, 2009;Roca-Perez et al, 2010;Tolu et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Macro‐ and microelements in pumpkin seed oils: Effect of processing, crop season, and country of origin

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Macro‐ and microelements in the samples of virgin and cold pressed pumpkin seed oils produced in Croatia through two consecutive crop seasons were determined by inductively coupled plasma–optical emission spectroscopy (ICP‐OES). Croatian oils were also compared to oils from Slovenia and Austria in order to assess differences in the element content. Magnesium, potassium, calcium, sodium, selenium, and iron were the dominant elements in all pumpkin seed oils. Their amounts together with barium, strontium, manganese, copper were up to ninefold higher ( p ≤ 0.05) in virgin compared to cold pressed pumpkin seed oils. These differences occur due to the different processing conditions which include salt addition, heat treatment, and higher degree of equipment ware out during virgin pumpkin seed oil production. As the sodium level increases with the addition of salt, virgin pumpkin seed oil could be considered its hidden source and producers should pay attention to the amount added. Contents of cobalt, copper, selenium, and thallium significantly differed ( p ≤ 0.05) between the two crop seasons. Principal component analysis revealed clear differences between samples with different origin that can be explained by the specifics in the production processes of each country. In comparison with Austrian and Slovenian, Croatian pumpkin seed oils had significantly lower contents of sodium, potassium, calcium, magnesium, and tin while bismuth and selenium were higher.

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Selenium and heavy metals content in some Mediterranean soils

Cited by 77 publications

References 35 publications

Effects of the European Union Agricultural and Environmental Policies in the Sustainability of Most Common Mediterranean Soils

Effects of the European Union Agricultural and Environmental Policies in the Sustainability of Most Common Mediterranean Soils

Selenium speciation and bioavailability in Dutch agricultural soils: the role of soil organic matter

Macro‐ and microelements in pumpkin seed oils: Effect of processing, crop season, and country of origin

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