激光共振電離質(zhì)譜法測量錫的同位素比
發(fā)布時間:2019-05-22 01:21
【摘要】:采用實驗室研制的激光共振電離質(zhì)譜儀,建立了錫(Sn)同位素的激光共振電離質(zhì)譜分析方法。測量了錫原子的自電離態(tài)光譜,確認(rèn)了錫的一條三色三光子共振電離路徑,其各步激發(fā)/電離的激光波長分別為λ_1=286.4 nm、λ_2=811.6 nm、λ_3=823.7 nm;通過將樣品與氧化石墨烯溶液混合制樣,有效提高了錫樣品的電熱原子化效率,1μg錫的總探測效率達(dá)到3×10~(-5)以上,是直接滴樣方式的4.5倍左右。采用本方法對錫、銻、碲(1∶1∶1,m/m)混合模擬樣品進(jìn)行測試,實現(xiàn)了錫的選擇性電離,有效避免了測量過程中銻、碲對錫的同量異位素干擾,樣品中主要同位素比~(116)Sn/~(120)Sn,~(117)Sn/~(120)Sn,~(118)Sn/~(120)Sn和~(119)Sn/~(120)Sn測量的相對標(biāo)準(zhǔn)偏差均1%。結(jié)果表明,本方法能夠有效解決TIMS、ICP-MS等商業(yè)質(zhì)譜儀在錫同位素質(zhì)譜分析過程中的同量異位素干擾難題,有望應(yīng)用于反應(yīng)堆乏燃料中裂變產(chǎn)物~(121)mSn、~(126)Sn的測量。
[Abstract]:A laser resonance ionization mass spectrometry method for the analysis of tin (Sn) isotopes was established by using a laser resonance ionization mass spectrometer developed in the laboratory. The autoionization spectra of tin atoms have been measured, and a trichromatic three-photonic resonance ionization path of tin has been confirmed. The laser wavelengths of each step excitation / ionization are 位 _ 1 鈮,
本文編號:2482554
[Abstract]:A laser resonance ionization mass spectrometry method for the analysis of tin (Sn) isotopes was established by using a laser resonance ionization mass spectrometer developed in the laboratory. The autoionization spectra of tin atoms have been measured, and a trichromatic three-photonic resonance ionization path of tin has been confirmed. The laser wavelengths of each step excitation / ionization are 位 _ 1 鈮,
本文編號:2482554
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