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摘要
Highly sensitive zinc analysis was necessary and important in different fields, such as industrial production, metallurgical manufacturing and so on. Conventional laser-induced breakdown spectroscopy (LIBS) had relatively low analytical sensitivity in the determination of zinc elements in solid samples. High repetition rate spark-discharge enhanced laser-induced breakdown spectroscopy combined with weak signal detection with lock-in amplifier was developed to realize highly sensitive zinc analysis for aluminum alloy samples. Experimentally operated under 1 kHz pulse repetition rate, the optical radiation of laser-induced plasma was enhanced by spark-discharge; the zinc atomic emission signal was selectively amplified and the continuum background of the plasma radiation was rejected by a gated pre-amplifier; finally a lock-in amplifier was used to realize highly sensitive detection of weak atomic emission signal. Based on the standard samples, a calibration curve of zinc in aluminum alloy samples was established under currently optimized experimental conditions. The limit of detection for zinc reached 3.8 μg/g, which was an order better than those obtained by traditional LIBS in analysis of zinc in aluminum alloy. This technology was helpful to realize direct and highly sensitive quantitative analysis of zinc and other elements in alloy samples, and could be well applied in the field of metallurgical analysis. ? 2020, CISRI Boyuan Publishing Co., Ltd. All right reserved.
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