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Characteristics of different types of biochar and effects on the toxicity of heavy metals to germinating sorghum seeds

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    0482432 - ÚEB 2018 RIV NL eng J - Journal Article
    Soudek, Petr - Rodriguez Valseca, I. M. - Petrová, Šárka - Song, J. - Vaněk, Tomáš
    Characteristics of different types of biochar and effects on the toxicity of heavy metals to germinating sorghum seeds.
    Journal of Geochemical Exploration. Roč. 182, NOV (2017), s. 157-165. ISSN 0375-6742. E-ISSN 1879-1689
    R&D Projects: GA MŠk(CZ) LD13029
    Institutional support: RVO:61389030
    Keywords : polycyclic aromatic-hydrocarbons * sorption behavior * soil * copper * lead * contaminants * remediation * amendments * mobility * compost * Biochar * Copper * Lead * Cadmium * Seed germination * Sorghum bicolor * PAHs * Sorption
    OECD category: Plant sciences, botany
    Impact factor: 2.858, year: 2017

    Soils contaminated with heavy metals are often notably nutrient poor and unsuitable for plant growth. The addition of biochar can significantly improve soil properties. In this study, the contents of organic compounds and inorganic elements in biochar and the effect of biochar on plant germination were examined. The PAH content of biochar from four different sources was examined, and naphthalene, phenanthrene, fluoranthene and pyrene were identified as primary compounds. The most abundant inorganic elements were potassium, calcium, magnesium, sodium, aluminium, iron and manganese, with strontium and barium also being significantly elevated. The pH of biochar from all sources was strongly alkaline. The sorption characteristics for heavy metals (Cd, Cu and Pb) were also tested for the different types of biochar. Adsorption data were well-described by a Langmuir isotherm with maximum Cd (II), Cu (II) and Pb (II) adsorption capacities of 20.16, 7.83 and 70.92 mg/g for bamboo-derived biochar, 18.80, 13.85 and 200 mg/g for rice husk-derived biochar, 11.63, 20.08 and 123.46 mg/g for ash tree-derived biochar, and 15.11, 10.86 and 196.08 mg/g for beech tree-derived biochar, respectively. The effect of biochar on the toxicity of heavy metals was measured by the inhibition of sorghum seed germination. With biochar, the toxicity of cadmium, copper and lead was reduced. Bamboo-derived biochar was less efficient in reducing the toxicity of cadmium and copper compared with the other types of biochar. For lead, the rice husk-derived biochar was the least efficient in reducing the toxicity.
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    2017_Soudek_JOURNAL OF GEOCHEMICAL EXPLRATION_157.pdf41.3 MBOtheropen-access
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