低功率微波热雾化器与同轴气动雾化器作为电感耦合等离子体发射光谱法进样装置的比较

Comparison of a Low Microwave-Powered Thermospray Nebulizer and a Meinhard-Pneumatic Nebulizer for Inducrively Coupled Plasma-Atomic Emission Spectrometry

对用低功率微波热雾化器 (MWTN)和同轴气动雾化器 (PN)作为电感耦合等离子体发射光谱仪 (ICP AES)进样装置时 ,仪器的操作条件 (样品提升速率 (Ql)、载气流速 (Fc) )进行了选择和比较。在选定的条件下 ,比较了两种雾化器的分析性能。发现HCl的浓度对两种雾化器的影响不同 ,对于MWTN ,Cr、Cd、Co、Mn和La,谱线的发射强度随HCl浓度的增加而略有增加 ;而对于PN ,谱线的发射强度随HCl浓度的增加而略有降低 ;MWTN对于上述 5种元素的检出限均优于PN ,而精密度则不如后者。

The analytical performance of two sample introduction systems, a low-microwave-powered thermospray nebulizer (MWTN) and a meinhard-pneumatic nebulizer (PN), coupled to an inductively coupled plasma atomic emission spectrometer, was compared. Several parameters including the sample uptake rate and the carrier gas flow rate were selected and compared. Under selected conditions, the effect of HCl concentration on emission intensity of elements, detection limits(DL) and relative standard deviation(RSD) for Cd, Co, Cr, Mn, La with both nebulizers was studied. The DLs obtained with MWTN are lower than those with PN, but the RSDs are worse with MWTN than with PN.