Citation:
WANG Hao-Yu, CHEN Sha, YIN Peng-Kun, LIN Qing-Yu, WANG Xu, DUAN Yi-Xiang. A Novel Laser Ablation Chamber for Microwave Plasma Atomic Emission Spectrometry and Its Application[J]. Chinese Journal of Analytical Chemistry,
;2020, 48(10): 1296-1304.
doi:
10.19756/j.issn.0253-3820.201238
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Microwave plasma torch atomic emission spectrometry (MPT-AES) is a widely used element detection method. However, MPT-AES requires complex digestion and desolvation treatment when detecting solid samples. After many improvements, a new Z-shaped laser ablation chamber and constructing laser ablation microwave plasma torch atomic emission spectroscopy (LA-MPT-AES) was developed. This method eliminated the complex processing of solid samples. The ablation chamber was sealed with a flat surface of solid sample (>3 mm×2 mm), which did not limit the size of the solid sample. The chamber internal volume was 0.04 cm3, the cleaning time was as low as 0.5 s, and the relative standard deviation (RSD) of the signal when analyzing pure Cu samples was 1.2% (n=11). Under the optimal experimental conditions, 12 elements (Si, Mg, Fe, Al, Mn, Ca, Ba, Sr, Na, Li, K, Rb) in the rock-polyethylene tablet were detected, and the detection limit was 0.00002-362 μg/g, with relative standard deviations of 3.7%-9.1% (n=11). The 10 elements in the 3 igneous rock samples were analyzed, showing good uniformity with the theoretical values, with a relative error of 0.04%-14.32%. The LA-MPT-AES had good stability, and its sensitivity was comparable to laser ablation inductively coupled plasma-atomic emission spectrometry (LA-ICP-AES), and even better for some elements. Otherwise, the cost of using this method was much lower than that of the LA-ICP-AES.
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