Arsenic(V) and vanadium(V) fractionation after its incorporation into a sandy loam soil from Pampas region, Argentina

IF 2.9 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Carla A. Costamagna, Marcos A. Orellana Benítez, Marc Benedetti, Raúl S. Lavado, Fernando V. Molina
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Abstract

Arsenic is a well-known toxic substance, widely distributed, whereas vanadium is a pollutant of emerging interest. Both have been found to correlate positively in groundwaters, thus concern arises on the effect of these pollutants on crops, if such waters are used for irrigation. We conducted a study on the effect of aging with a typical crop soil mimicking soils initially irrigated with water containing As and V. Afterwards, the soil was subjected to wet/dry cycles. The fractionation of both elements at different times from the addition (onset of the experiment) was determined by a modified European Community Bureau of Reference (BCR) method. It is found that the greater part of V is located in the most stable fraction from the onset of the experiment. This is attributed to interaction with amorphous and clay minerals and the precipitation of Ca(VO3)2, which is predicted by speciation modeling. The remaining fractions show the expected behavior: the most labile fraction decreases over time, that associated to oxidizable increases with time, whereas the fraction associated to reducible components stays approximately constant. Arsenic shows a lower proportion in the most stable fraction compared with V, and a higher proportion in the most labile, but otherwise shows similar tendencies. The results suggest a low availability of V and a higher one of As. No competence was observed between As and V in the experimental conditions.

Abstract Image

阿根廷潘帕斯地区砂壤土中加入砷(V)和钒(V)后的分馏情况
砷是一种众所周知的有毒物质,分布广泛,而钒是一种新兴的污染物。已发现两者在地下水中呈正相关,因此,如果这些水用于灌溉,这些污染物对作物的影响引起了关注。以典型作物土壤为研究对象,模拟土壤初始灌溉含砷和含v水的土壤,对土壤进行干湿循环处理。从加入(实验开始)开始的不同时间,这两种元素的分馏是通过改进的欧洲共同体参考局(BCR)方法确定的。我们发现V的大部分从实验开始就处于最稳定的分数中。这归因于与无定形和粘土矿物的相互作用以及Ca(VO3)2的沉淀,这是由物种形成模型预测的。剩余的组分表现出预期的行为:最不稳定的组分随着时间的推移而减少,与可氧化组分相关的组分随着时间的推移而增加,而与可还原组分相关的组分保持大致不变。与V相比,砷在最稳定组分中所占比例较低,而在最不稳定组分中所占比例较高,但在其他方面表现出相似的趋势。结果表明,V的可用性较低,而As的可用性较高。在实验条件下,没有观察到As和V之间的能力。
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来源期刊
Environmental Monitoring and Assessment
Environmental Monitoring and Assessment 环境科学-环境科学
CiteScore
4.70
自引率
6.70%
发文量
1000
审稿时长
7.3 months
期刊介绍: Environmental Monitoring and Assessment emphasizes technical developments and data arising from environmental monitoring and assessment, the use of scientific principles in the design of monitoring systems at the local, regional and global scales, and the use of monitoring data in assessing the consequences of natural resource management actions and pollution risks to man and the environment.
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