Journal
MOLECULES
Volume 26, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/molecules26092651
Keywords
tellurium; technology critical element; TCE; BCR; speciation; IC-ICP-MS; ICP-MS; fractionation; WEEE; electrowaste
Funding
- National Science Centre of Poland [UMO2018/29/B/ST10/01522]
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The optimization and validation of a method for determining and extracting inorganic ionic forms of Te(VI) and Te(IV) in soil were conducted using IC-ICP-MS. The results showed that tellurium was mainly bound with sulphides, organic matter, and silicates in the soil samples, and both Te species were present in the tested samples.
The optimization and validation of a methodology for determining and extracting inorganic ionic Te(VI) and Te(IV) forms in easily-leached fractions of soil by Ion Chromatography-Inductively Coupled Plasma-Mass Spectrometry (IC-ICP-MS) were studied. In this paper, the total concentration of Te, pH, and red-ox potential were determined. Ions were successfully separated in 4 min on a Hamilton PRPX100 column with 0.002 mg/kg and 0.004 mg/kg limits of detection for Te(VI) and Te(IV), respectively. Soil samples were collected from areas subjected to the influence of an electrowaste processing and sorting plant. Sequential chemical extraction of soils showed that tellurium was bound mainly with sulphides, organic matter, and silicates. Optimization of soil extraction allowed 20% average extraction efficiency to be obtained, using 100 mM citric acid as the extractant. In the tested soil samples, both tellurium species were present. In most cases, the soils contained a reduced Te form, or the concentrations of both species were similar.
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