微波诱导等离子体原子吸收光谱法测定Mg,Pb,Zn的研究

DETERMINATION OF Mg、Pb AND Zn WITH MICROWAVE INDUCED PLASMA ATOMIC ABSORPTION SPECTROMETRY (MIP-AAS)

微波诱导等离子体（MIP）应用于原子吸收光谱法（AAS）起始于1970年,当时由于灵敏度不高,加之是在减压条件下工作,因而未能引起人们的重视。1988年,本室采用常压Ar—MIP作为AAS的原子化器,用电热进样的方法测定了Cu、Ag、Pb等元素,获得了较好的结果。Ng等人采用气功雾化的进样方法,用MIP—AAS测定了Cu、Mn、Ca等元素,其特征浓度在μg/ml水平。本文是在上述研究的基础上,改用超声雾化方法将样品引入MIP中,用水冷凝和浓H2SO4吸收相结合的方法去溶,研究了对Mg、Pb和Zn的测定,并用于实际样品分析,取得了较好的结果。

The method of MIP—AAS with ultrasonic nebulization sample introduction system was studied. The experimental parameters, such as microwave power, carrier gas flow rate as well as acidity of sample solution, were selected and optimized for the determination of Mg, Pb, Zn. The influence of coexistence of elements and easily ionized elements on the absorbance of analysis was also discussd. The recommended method has been successfully applied to analyze practical samples, and satisfactory results have been achieved.