生物炭
修正案
土壤水分
环境化学
化学
铊
黄铁矿
砷
硫化物
土壤pH值
生物利用度
环境科学
矿物学
无机化学
土壤科学
生物信息学
有机化学
热解
生物
政治学
法学
作者
Juan Liu,Ruoxuan Qiu,Xudong Wei,Xinni Xiong,Shixing Ren,Yuebing Wan,Haizhen Wu,Wenhuan Yuan,Jin Wang,Mingliang Kang
标识
DOI:10.1016/j.envres.2023.117577
摘要
The prevalence of toxic element thallium (Tl) in soils is of increasing concern as a hidden hazard in agricultural system and food chains. In the present work, the immobilization effects of pure biochar and jacobsite (MnFe2O4)-biochar composite (MFBC) were evaluated for their immobilization effects in Tl-polluted agricultural soils (Tl: ∼10 mg/kg). Overall, MFBC had an efficient effect on Tl immobilization, and the effect was strengthened with the increase in the amendment ratio. After being amended by MFBC for 15 and 30 days, the labile fraction of Tl in soil decreased from 1.55 to 0.97 mg/kg, and from 1.51 to 0.88 mg/kg, respectively. In addition, pH (3.05) of the highly acidic soil increased to a maximum of 3.97 during the immobilization process. Since the weak acid extractable and oxidizable Tl were the preponderantly mitigated fractions and displayed a negative correlation with pH, it can be inferred that pH may serve as one of the most critical factors in regulating Tl immobilization process in MFBC-amended acidic soils. This tentative study indicated a great potential of jacobsite-biochar amendment in stabilization and immobilization of Tl in highly acidic and Tl-polluted agricultural soils; it would bring considerable environmental benefit to these Tl-contaminated sites whose occurrence has significantly increased in recent decades near the pyrite or other sulfide ore mining and smelting area in many nations.
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