期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 440, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2022.129795
关键词
Biochar; PAHs; PAHs derivatives; Physical aging; Chemical aging
资金
- National Sci- ence Centre Poland [2018/31/B/NZ9/00317]
- National Science Centre, Poland - Czestochowa Univer- sity of Technology, Faculty of Infrastructure and Environment
Applying biochar to the soil can enhance soil properties and crop productivity. However, it may contain potentially toxic compounds. This study found that long-term aging affects the physicochemical properties of biochar and significantly increases the bioavailability of toxic compounds.
Biochar applied into the soil is recommended as an effective tool for increasing its properties and crop productivity. However, biochar can contain some potentially toxic compounds such as polycyclic aromatic hydro-carbons (PAHs). Moreover, during biochar production or environmental application (e.g. as soil fertilizer), more toxic PAHs derivatives containing nitrogen, oxygen or sulfur can be formed. There is a lack of information on how the environmental factors affect the bioavailability of such compounds during the long-term application of BC into the soil. In the presented studies the effects of physical (freeze-thaw cycles) and chemical aging (temperatures 60 ? and 90 ?) on the total and bioavailable content of PAHs and their derivatives were estimated. The results indicate that long-term (6 months) aging affected the physicochemical characteristic of biochars promoting the formation of new C and O-containing species on the BC surface increasing their polarity and hydrophilicity. Physical and chemical aging promoted the formation of compounds with higher molecular weight and a significant (up to 550 %) increase in the bioavailability of PAHs and their derivatives. The results of this study highlight the importance of the bioavailable fraction of PAHs and their derivatives for evaluation of the toxicity of aged biochar.
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