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Solution Cathode Glow Discharge Based on Charge Coupled Device Detector.

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    Area of Science:

    • Analytical Chemistry
    • Materials Science
    • Geochemistry

    Background:

    • Lithium is a critical strategic resource for green energy and light alloys.
    • Salt lake brine is a primary source of lithium, with China possessing significant reserves.
    • Existing analytical techniques are not suitable for on-site exploration in remote regions.

    Purpose of the Study:

    • To develop a portable analytical instrument for on-site lithium determination in salt lake brine.
    • To establish a rapid and accurate method for lithium analysis using the developed instrument.
    • To address the limitations of current experimental techniques for remote brine resource assessment.

    Main Methods:

    • Development of a portable Solution Cathode Glow Discharge-Atomic Emission Spectrometry (SCGD-AES) instrument (Li-K analyzer) with a CCD detector.
    • Selection of the 670.78 nm spectral line for lithium detection.
    • Establishment of an analytical method for lithium in Tibetan salt lake brines, comparing standard curve and standard addition methods with ICP-MS.

    Main Results:

    • The portable Li-K analyzer (35x19x27 cm, 10 kg) achieved a lithium detection limit of 4 ng·mL-1 and precision (RSD) better than 2%.
    • The standard addition method effectively mitigated matrix effects, yielding results consistent with ICP-MS, unlike the standard curve method.
    • Accurate lithium determination was achieved using only two points with the standard addition method, simplifying workload.

    Conclusions:

    • The developed portable Li-K analyzer provides a viable solution for on-site lithium analysis in salt lake brines.
    • The standard addition method is crucial for accurate lithium quantification in complex brine matrices.
    • This work establishes a methodological foundation for efficient exploration and exploitation of remote lithium resources.