Batch washing of lead contaminated and spiked soils using extracts of dried Terminalia mantaly, Panicum maximum and Eleusine indica plants

IF 1 Q4 CHEMISTRY, MULTIDISCIPLINARY
E. U. Etim
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引用次数: 2

Abstract

Abstract Application of dried plant water soluble extracts in soil Pb decontamination is rear, but advantageous due to their ecological biodegradability. Single batch laboratory scale suitability of Terminalia mantaly, Panicum maximum, Eleusine indica and water as washing solutions for Pb removal from contaminated and spiked soils at different soil pulp densities (3%, 6%, 9%, 12%, 15% and 18%) and washing time (1, 3, 6, 12, 24 and 96 h) was investigated. Washings of Terminalia mantaly and Panicum maximum proved more efficient comparatively for contaminated soil with Pb removal efficiency of 27.2±0.64% and 27.0±0.52% respectively at 3% soil pulp density and washing time of 96 h. Removal efficiency increased with increasing washing time but decreased with increasing of soil pulp density. Furthermore, water was found effective for removing Pb from spiked soils with maximum removal efficiency of 74.5±3.38% at 3% soil pulp density after 1 h washing. High exchangeable fraction of Pb (81.2%) in spiked soil makes water more suitable against other washing solutions. Statistical t-testing showed significant difference in Pb removal efficiency between contaminated and spiked soils for all four washing solutions, reflecting differences in geochemical phases of Pb in both soils. Terminalia mantaly and Panicum maximum showed promising result in soil washing and have potential for application in Pb removal from contaminated soils. However, chemical modifications are needed to enhance and improve on their efficiencies. Similarly, more information is needed to predict and model removal efficiencies when multiple washing steps are applied.
用干燥的天竺葵、大洋参和莲花植物提取物批量清洗铅污染和尖刺土壤
摘要植物水溶性提取物在土壤铅净化中的应用尚不成熟,但由于其生态可降解性具有优势。在不同土壤浆密度(3%、6%、9%、12%、15%和18%)和洗涤时间(1、3、6、12、24和96 h)下,研究了manalia、Panicum maximum、Eleusine indica和水作为污染和尖刺土壤中铅的洗涤溶液的单批实验室规模适用性。结果表明,在土壤浆密度为3%、洗涤时间为96 h的条件下,大黄尾草和大黄尾草对污染土壤的Pb去除率分别为27.2±0.64%和27.0±0.52%,随着洗涤时间的增加,去除率提高,但随着土壤浆密度的增加,去除率降低。在土壤浆密度为3%的条件下,水对钉螺土壤中铅的去除效果最好,水洗1 h后的去除效率最高可达74.5±3.38%。钉螺土壤中铅的高交换率(81.2%)使水更适合于其他洗涤溶液。统计t检验结果显示,4种洗涤液对污染土壤和尖刺土壤的铅去除率差异显著,反映了两种土壤中铅的地球化学相态的差异。尾草和大头草具有良好的洗土效果,在污染土壤的铅去除中具有应用潜力。然而,需要化学修饰来增强和改善它们的效率。同样,当应用多个洗涤步骤时,需要更多的信息来预测和建模去除效率。
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来源期刊
Ovidius University Annals of Chemistry
Ovidius University Annals of Chemistry CHEMISTRY, MULTIDISCIPLINARY-
自引率
11.10%
发文量
20
审稿时长
5 weeks
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