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再循环雾化系统(RCNS)在ICP-AES的小体积样品分析中具有某些优点。何志壮和Barnes证实了用重复循环雾化室中的气溶胶,1毫升溶液可以喷雾50分钟。然而,最近使用该系统时,观察到了浓缩效应,这可能是由于大小不一的气溶胶滴的气溶胶蒸发和分离所致。用两个RCNS系统:其一由本实验制作,另一由J.E.Meinhard Associafes制作,进行了实验并比较了结果。短期或长期发射信号的稳定性受分析物浓缩效应的影响,虽然并不很严重。1微克/毫升的Fe,Mn和Cu溶液在不同的积分时间范围内所得到的信号的相对标准偏差(RSD)有明显的差别。对于典型的ICP硬线Mn257.61nm,在10,20,40和56分钟内其相应的RSD%值分别为1.10%,2.20%,5.15%,和8.17%。长期稳定性可通过将氙气载气用水蒸气饱和而获显著改善,浓度改变的偏差得以消除。对于同一硬线Mn257.61nm,当积分时间为10,20,40和60分钟时,其RSD%分别为1.49%,1.18%,1.54%和1.69% 对使用内标法以降低信号改变的浓度效应的结果也进行了讨论。
The Regenerative Atomization System (RCNS) has certain advantages in the small sample size analysis of ICP-AES. He Zhizhuang and Barnes confirmed that with 1 ml of solution sprayed for 50 minutes with repeated circulation of the aerosol in the spray chamber. However, the most recent use of this system has observed a concentration effect, possibly due to the aerosol evaporation and separation of aerosol droplets of different sizes. Two RCNS systems were used: one was made in this experiment and the other was made by J.E. Meinhard Associafes. Experiments were conducted and the results were compared. The stability of short-term or long-term transmitted signals is affected, albeit not very severely, by the effect of the analyte concentration. The relative standard deviations (RSDs) of the signals obtained at 1 μg / ml for Fe, Mn and Cu solutions differed significantly over different integration times. For a typical ICP hard-wire Mn257.61 nm, their corresponding RSD% values were 1.10%, 2.20%, 5.15%, and 8.17% respectively in 10, 20, 40 and 56 minutes. Long-term stability can be significantly improved by saturating the xenon carrier gas with water vapor, eliminating variations in concentration. RSD% were 1.49%, 1.18%, 1.54% and 1.69%, respectively, for the same hard line Mn257.61 nm at 10, 20, 40 and 60 minutes integration time using the internal standard method to reduce the concentration effect of signal changes The results are also discussed.