黑钙土和露维醇在铜离子实验污染下的屏障功能评价

Q4 Agricultural and Biological Sciences Biulleten'' Pochvennogo instituta im VV Dokuchaeva Pub Date : 2023-09-25 DOI:10.19047/0136-1694-2023-116-76-108
A. D. Iovcheva, I. N. Semenkov
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引用次数: 0

摘要

本研究的目的是评估黑钙土和露维索尔表层土壤对模拟铜污染的生态抗性。为了确定土壤的吸附能力和获得所需的污染水平,进行了实验。20 ~ 200mg /L的乙酸铜溶液污染土壤,相当于输入20 ~ 2 000 mg/kg的铜。Langmuir方程对Cu吸附等温线的近似具有统计学意义。黑钙土的最大吸附量(cmax)和朗缪尔常数(kl)均高于露visol。这表明,与露visol相比,黑钙土对铜的吸附能力更高,吸附量更大。这与黑钙土有机质含量和组成较高、质地较重、pH值偏中性有关。通过顺序选择性提取的方法发现,在未污染的土壤中,超过50%的铜与硅酸盐组分紧密结合(>50%)。对不同污染水平下Cu分异的评估显示,在200 mg/kg的污染水平下,黑钙土中Cu生物可利用形式(交换性和酸溶性)的百分比略有增加,而在200 mg/kg的污染水平下,Luvisol中的Cu生物可利用形式的百分比显著增加。在大约2000毫克/千克铜的污染下,这两种土壤的特点是主要是生物可利用的和与铁和锰形式的(水合)氧化物结合的池。在原生土壤和200 mg/kg污染土壤中,黑钙土的迁移系数不超过10%,露露醇的迁移系数不超过25%,表明其Cu的生物利用度分别为低和中等。2 000 mg/kg的Cu污染使Chernozem的迁移系数增加了25%,Luvisol的迁移系数增加了40%,这意味着Cu迁移到邻近环境的中高风险。
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Assessment of the barrier function of Chernozem and Luvisol under their experimental contamination by copper ions
The aim of the work was to assess the ecological resistance of topsoils of Chernozem and Luvisol to modeled copper contamination. To determine the sorption capacity of soils and to obtain the required levels of contamination the experiment was carried out. Soils were contaminated by the Cu acetate solutions with concentrations from 20 to 200 mg/L, which corresponds to the input of 20–2 000 mg/kg of Cu. Approximation of Cu adsorption isotherms by the Langmuir equation was statistically significant. The obtained values of maximum adsorption (C max ) and Langmuir constant (K L ) for Chernozem were higher than for Luvisol. This indicates a higher adsorption capacity and stronger retention of adsorbed Cu in Chernozem compared with Luvisol. This fact can be explained by the higher content and composition of organic matter, the heavier texture and the neutral pH value of Chernozem. By the method of sequential selective extractions, it was found that in uncontaminated soils, more than 50% of Cu is strongly bounded to silicate fraction (>50%). Assessment of Cu fractionation at different levels of contamination reveals a slight increase in the percentage of Cu bioavailable forms (exchangeable and acid-soluble) in Chernozem at 200 mg/kg and its significant increase in Luvisol at 200 mg/kg. At contamination of about 2 000 mg/kg Cu, both soils are characterised by a predominance of pools of bioavailable and bound to (hydr)oxide of Fe and Mn forms. The mobility factor does not exceed 10% for Chernozem and 25% for Luvisol in the native and contaminated by 200 mg/kg soils, which indicates low and medium bioavailability of Cu in them, respectively. Contamination by 2 000 mg/kg of Cu increased the mobility factor up to 25% in Chernozem and up to 40% in Luvisol, which means the medium and high risk of Cu migration into the adjacent environments.
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来源期刊
CiteScore
0.90
自引率
0.00%
发文量
15
审稿时长
8 weeks
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