Comparison of two sequential extraction procedures for tungsten fractionation in the tungsten mining soils

Li, Ruiping; Wang, Wenjie; Wang, Shiliang; Lin, Chunye; Wang, Xiangyi; Meng, Lingchuan; Yuan, Xianlong

doi:10.1039/c9ra07158j

Cited by 14 publications

(10 citation statements)

References 25 publications

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“…For heavy metals present in a cationic form, there are various sequential extraction procedures (SEP) that can be used; for tungsten, it is necessary to select extractions for a metal present in the anionic form. A comparison with the Tessier SEP [51], which is often used for cationic metals, showed that the sequential extraction scheme used by Wenzel [52] for the study of arsenic was also the most appropriate SEP for estimating tungsten mobility and bioavailability [53]. Soil chemistry assesses the distribution of metal in the various pools.…”

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The Dynamics of Tungsten in Soil: An Overview

Petruzzelli¹,

Pedron²

2021

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The increasing use of tungsten in the production of green energy in the aerospace and military industries, and in many other hi-tech applications, may increase the content of this element in soil. This overview examines some aspects of the behavior of tungsten in soil, such as the importance of characteristics of soils in relation to bioavailability processes, the chemical approaches to evaluate tungsten mobility in the soil environment and the importance of adsorption and desorption processes. Tungsten behavior depends on soil properties of which the most important is soil pH, which determines the solubility and polymerization of tungstate ions and the characteristics of the adsorbing soil surfaces. During the adsorption and desorption of tungsten, iron, and aluminum oxides, and hydroxides play a key role as they are the most important adsorbing surfaces for tungsten. The behavior of tungsten compounds in the soil determines the transfer of this element in plants and therefore in the food chain. Despite the growing importance of tungsten in everyday life, environmental regulations concerning soil do not take this element into consideration. The purpose of this review is also to provide some basic information that could be useful when considering tungsten in environmental legislation.

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“…Whichever SEP is used, most of the tungsten is generally recovered in the last residual phase, which shows the chemical form of tungsten that is most strongly retained by soil solid components. These residual fractions pose the lowest environmental risk [53,54].…”

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The Dynamics of Tungsten in Soil: An Overview

Petruzzelli¹,

Pedron²

2021

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“…The role of such minerals as scheelite and W-containing goethite in the W distribution in the soil appears insignificant. Sequential extraction procedures for fractionation of W (Li et al, 2019) are required to determine the proportion of different forms of W in the soil.…”

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confidence: 99%

Modes of occurrence of tungsten in alluvial soils and river sediments in the area of the Grantcharitsa tungsten deposit, Western Rhodopes, Bulgaria

Tarassov¹,

Tarassova²,

Stavrev³

et al. 2021

Rev. Bulg. Geol. Soc.

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A distinct increase in the concentration of W in the topsoil (from 19–20 to 71 ppm) is found in the vertical profile of the alluvial soil at the Grantcharitsa deposit. The distribution of W, Fe, and C is well correlated, which indicates a significant role of organic material and iron oxides/hydroxides formed in the soil in the chemical behavior of W. The role in these processes of scheelite, W-containing goethite and rutile identified in the soil is insignificant.

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“…Analyses of soil properties (pH, organic matter, cation exchange capacity, clay, silt, and sand) and W environmental availability were performed on the 2 mm air-dried soil fraction by standard methods [37]. To evaluate W environmental availability (BAV) the Wenzel sequential extraction procedure (SEP) [38] was used as it is considered the most appropriate for tungsten speciation [39].…”

Section: Tungsten Environmental Availability and Bioaccessibility Eva...mentioning

confidence: 99%

“…The five fractions of the Wenzel SEP were determined using the following extractions: F1: 0.05 M (NH 4 ) 2 SO 4 , 4 h, 25 • C ratio soil/extractant 1:25; F2: 0.05 M NH 4 H 2 PO 4 , 16 h, 25 • C ratio soil/extractant 1:25; F3: 0.2 M NH 4 -oxalate buffer in the dark (pH = 3.25), 4 h, 25 • C ratio soil/extractant 1:25; F4: 0.2 M NH 4 -oxalate buffer + 0.1 M ascorbic (pH = 3.25), 0.5 h, 96 • C ratio soil/extractant 1:25; and F5: HNO 3 -HClO 4 , 180 • C ratio soil/extractant 1:50 [39]. Tungsten recovery by this method ranged from 98.8% to 101%.…”

Section: Tungsten Environmental Availability and Bioaccessibility Eva...mentioning

confidence: 99%

Tungsten Bioaccessibility and Environmental Availability in Tungsten-Spiked Agricultural Soils

Petruzzelli,

Pedron

2024

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Tungsten is an essential element for many cutting-edge industries. Its use is increasing, so much that it has become a “critical element”. With the increase in the use of tungsten, a possible increase in its presence in environmental matrices including soil is expected. In this research, we assessed the environmental availability and bioaccessibility of W in relation to soil properties. Four representative Mediterranean soils, collected in Italy, were spiked with tungsten and incubated for 12 months. In the spiked soils, the environmental availability of the element was determined by the Wenzel sequential extractions. The bioaccessibility was determined by the UBM (BARGE) method in both the gastric and intestinal phases. The findings indicated that the environmental availability is largely influenced by soil properties such as pH and organic matter, while a lower influence was discovered for bioaccessibility, particularly for the gastric phase. These differences could be ascribed to the characteristics of the extractants utilized in the various tests, in particular the pH values. These results could be a valuable reference to integrate with studies on really and not spiked contaminated soils, for the improvement of risk assessments and the development of strategies for remediating soils polluted with tungsten.

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Comparison of two sequential extraction procedures for tungsten fractionation in the tungsten mining soils

Abstract: The Wenzel SEP showed higher extraction efficiency in potentially mobile tungsten fractions, especially for the tungsten associated with iron hydroxides.

Cited by 14 publications

References 25 publications

The Dynamics of Tungsten in Soil: An Overview

The Dynamics of Tungsten in Soil: An Overview

Modes of occurrence of tungsten in alluvial soils and river sediments in the area of the Grantcharitsa tungsten deposit, Western Rhodopes, Bulgaria

Tungsten Bioaccessibility and Environmental Availability in Tungsten-Spiked Agricultural Soils

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