We developed an ion-associate phase (IAP)-extraction/acid back-extraction system for the preconcentration and atomic spectrometric determination of lithium trace amounts in water. The chelating reagent for lithium also works as a constituent of the extraction phase. The lithium in a 10 mL sample solution was converted through a chelate complex reaction with 2,2,6,6-tetramethyl-3,5-heptanedione (HDPM). The addition of a benzyldimethyltetradecylammonium ion caused the formation of IAP suspension in the solution. Centrifugation of the solution led to the isolation of a liquid organic phase and the lithium complex was extracted as the upper phase from the centrifuge tube. After the aqueous phase was removed, lithium was back-extracted with a 400 μL nitric acid solution from the IAP. The acid phase was measured using liquid-electrode-plasma atomic-emission-spectrometry (LEP-AES) or graphite-furnace atomic-absorption spectroscopy (GF-AAS). The detection limits were 0.02 mg/L for LEP-AES and 0.02 μg/L for GF-AAS. This system was applied to the determination of environmental water. The HDPM in the organic phase was reusable.
CITATION STYLE
Mizuna, K., Murashima, R., Okazaki, T., Sazawa, K., Kuramitz, H., Taguchi, S., … Hata, N. (2020). Organic ion-associate phase extraction/back-microextraction for the preconcentration and determination of lithium using 2,2,6,6-tetramethyl-3,5-heptanedione by liquid electrode plasma atomic emission spectrometry and GF-AAS in environmental water. Analytical Sciences, 36(5), 595–600. https://doi.org/10.2116/ANALSCI.20SBP13
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