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Effect of soil amendments on molybdenum availability in mine affected agricultural soils
Environmental Pollution ( IF 8.9 ) Pub Date : 2020-11-21 , DOI: 10.1016/j.envpol.2020.116132
Xiaoqing Wang , Gianluca Brunetti , Wenjie Tian , Gary Owens , Yang Qu , Chaoxi Jin , Enzo Lombi

Molybdenum (Mo) contamination of agricultural soils around Mo-mining areas is of emerging environmental concern. This study evaluated potential practical techniques for chemical immobilization of three Mo contaminated agricultural soils via application of up to six amendments from four different types of materials including biosolids, biochar supported nanoscale zero-valent iron (BC-nZVI), drinking water treatment residues (WTR) and ferrous minerals (magnetite and ferrihydrite). The efficacy of the different amendments on soil Mo bioaccessibility and bioavailability was evaluated by monitoring Mo uptake in both monocotyledon (ryegrass) and dicotyledon (alfalfa) plants, soil extractable Mo, and Mo bioavailability as measured by Diffusive Gradient in Thin Films (DGT®). All amendments exhibited no immobilization effect and increased Mo extractability in the severely contaminated soil (264 mg Mo kg-1). In contrast, in lightly and moderately contaminated soils (22 and 98 mg Mo kg-1), biosolids, WTR and magnetite all reduced soil extractable Mo and decreased Mo uptake in both alfalfa and ryegrass shoots relative to controls (CK). Moreover, DGT showed that during incubation experiments while biosolids amendments increased Mo bioavailability from 115 to 378% compared to the CK treatments, all other amendments decreased Mo bioavailability insignificantly.



中文翻译:

土壤改良剂对受地雷影响的农业土壤中钼有效性的影响

钼矿区周围的农业土壤中的钼(Mo)污染引起了新的环境关注。这项研究评估了潜在的实用技术,通过应用四种不同类型的材料(包括生物固体,生物炭负载的纳米零价铁(BC- n))中的多达六种修饰物,化学固定三种受Mo污染的农业土壤。ZVI),饮用水处理残留物(WTR)和黑色金属矿物质(磁铁矿和水铁矿)。通过监测单子叶植物(黑麦草)和双子叶植物(苜蓿)中的Mo吸收量,土壤可提取的Mo以及通过薄膜中的扩散梯度测量的Mo的生物利用度,评估了不同改良剂对土壤Mo的生物利用度和生物利用度的有效性。 。在严重污染的土壤(264 mg Mo kg -1)中,所有修饰剂均未表现出固定化作用并增加了Mo的萃取性。相反,在轻度和中度污染的土壤中(22和98 mg Mo kg -1),相对于对照(CK),苜蓿和黑麦草新梢中的生物固体,WTR和磁铁矿均降低了土壤可提取的Mo,并减少了Mo的吸收。此外,DGT显示,在温育实验中,与CK处理相比,生物固形物改良剂将Mo的生物利用度从115提高到378%,而其他所有修饰物均显着降低了Mo的生物利用度。

更新日期:2020-11-22
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