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氯化钐的背景吸收在研究波长范围内呈单峰,其背景吸收来源于SmCl_2的分子蒸气和氯气;而硝酸钐的背景吸收在研究的波长内呈双峰,其背景吸收来源于NO和Sm_2O_3的分子蒸气、时间特性研究表明:氯化钐与硝酸钐背景吸收的时间分布有明显不同,可利用原子吸收信号与背景信号的时间分辨关系来减小甚至完全克服背景吸收干扰。温度特性研究表明:背景信号与加热速度和原子化温度有关。实验还表明:硝酸钐的背景吸收比氯化钐要小得多,因此把样品转变为硝酸盐,可大幅度地减小背景吸收的影响。
The background absorption of samarium chloride showed a single peak in the study wavelength range, and its background absorption was from molecular vapor and chlorine of SmCl 2. The background absorption of samarium nitrate was bimodal at the wavelength studied, and the background absorption was from NO and Sm 2 O 3 The results show that the time distribution of samarium chloride and samarium nitrate is obviously different, and the time-dependent relationship between atomic absorption signal and background signal can be used to reduce or completely overcome the background absorption interference. The study of temperature characteristics shows that the background signal is related to the heating rate and atomization temperature. Experiments also show that the background absorption of samarium nitrate is much less than that of samarium chloride, thus converting the sample to nitrate can drastically reduce the effect of background absorption.