研究目的
To develop a portable device for the analysis of selected elements in liquid using microplasma excitation and optical emission spectroscopy.
研究成果
The portable device successfully determined metals like Zn and Cd in solutions using microAPGD and OES, with detection limits comparable or better than literature values (e.g., 0.14 mg/L for Zn and 0.053 mg/L for Cd under optimal conditions). The solid tungsten anode provided better reliability than screen-printed anodes. Future work could focus on improving anode materials and reducing spectral interferences for broader applications.
研究不足
The screen-printed anodes degraded quickly due to microplasma etching, limiting their reliability. Molecular bands in the emission spectra interfered with the detection of Zn, especially with smaller cathode apertures. The device's performance was sensitive to flow rate and aperture size, requiring optimization for different analytes.
1：Experimental Design and Method Selection:
The study involved designing and fabricating modular ceramic-polymeric devices with microplasma sources. The microdischarge was ignited between a solid anode and a liquid cathode (analyzed solution) using LTCC technology for ceramic parts and 3D printing for polymeric housing. Both DC- and AC-driven microdischarges were tested, with AC found more stable.
2：Sample Selection and Data Sources:
Analyzed samples were
3：1 M HNO3 solutions containing 10 mg/L of Zn and Cd. List of Experimental Equipment and Materials:
Equipment included a peristaltic pump (Reglo Ismatec ICC), gas container with rotameter, high voltage suppliers (DC and AC), spectrometer (Shamrock 500i) with CCD detector (Newton DU-920-OE), diffraction gratings (1800 lines/mm for UV, 1200 lines/mm for Vis), and materials like DuPont 951 ceramic, gold, platinum, and tungsten electrodes.
4：Experimental Procedures and Operational Workflow:
Devices were assembled, microplasma was ignited, and emission spectra were acquired under varying conditions (flow rates from 1 to 4 mL/min, cathode aperture diameters of
5：0 and 5 mm). Data on detection limits for Zn and Cd were collected. Data Analysis Methods:
Emission spectra were analyzed to identify atomic lines (e.g., Zn at 213.9 nm, Cd at 228.8 nm), and detection limits were calculated based on signal intensities and interferences.
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