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  • P-ISSN1225-0163
  • E-ISSN2288-8985
  • SCOPUS, ESCI, KCI

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  • P-ISSN 1225-0163
  • E-ISSN 2288-8985

Aluminum in rocks: Optimized microwave-assisted acid digestion and UV-Vis spectrophotometric measurement

Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2023, v.36 no.5, pp.216-223
https://doi.org/10.5806/ast.2023.36.5.216
Thanh-Nho Nguyen (Faculty of Environmental and Food Engineering, Nguyen Tat Thanh University)
Huynh-Thuc Thai (Faculty of Environmental and Food Engineering, Nguyen Tat Thanh University)
Thi Anh-Dao Le (Faculty of Environmental and Food Engineering, Nguyen Tat Thanh University)
Minh-Huy Do (Faculty of Chemistry, University of Science, Vietnam National University)
Thi Huynh-Mai Le (Faculty of Chemistry, University of Science, Vietnam National University)
Quang-Huy Le (Faculty of Environmental and Food Engineering, Nguyen Tat Thanh University)
Thi Kim-Sinh Nguyen (School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST))
Cong-Hau Nguyen (Faculty of Environmental and Food Engineering, Nguyen Tat Thanh University)

Abstract

Aluminium (Al) is one of the major elements in rocks and its concentration can be varied, depending on different rock types as well as sources. The present study aimed to propose an analytical method based on the UV-Vis as a cheap, simple, and common instrument equipped in most laboratories for Al quantification in rocks after the microwave assisted acid digestion. The aluminone and 8-hydroxyquinoline were investigated for the colorimetric assay. The results show that the 8-hydroxyquinoline reagent was more favorable in terms of the minimized affects of the potential interferences present in the digested solutions, i.e., Fe3+, Si4+ and F-. The calibration curve was constructed from 0.10 mg/L to 3.00 mg/L with the goodness of linearity (R2 = 0.9996). The limits of detection and quantification (LOD and LOQ) were estimated, i.e., 0.029 mg/L and 0.087 mg/L, respectively. The 8-hydroxyquinoline was applied to real rock samples, demonstrating favorable precision (RSD = 0.34 %-1.8 %) and no remarkable differences were found compared to the inductively coupled plasma-mass spectrometry (ICP-MS) as a reference measurement approach.

keywords
Al, rocks, aluminone, 8-hydroxyquinoline, colorimetric

Graphical Abstract

AST-2023-041_R1_Graphical Abstract_001.png

Received
2023-07-02
Revised
2023-08-12
Accepted
2023-08-17
Published
2023-10-25
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Analytical Science and Technology