Some Influencing Factors on the Determination of Silver by Microwave Induced Plasma-Atomic Absorption Spectrometry With Ultrasonic Nebulization Sample Introduction System
Duan Yixiang, Zhang Hanqi, Lu Hui, Jin Qinhan~*(Q.Jin) (Department of Chemistry, Jilin University, Changchun 130023)
The determination of silver by microwave induced plasma-atomic absorption spectrometry is studied. The effect of some factors on the absorbance, such as microwave forward power,flow rate of the carrier gas and the acidity of the sample solution as well as type of acid was discussed systematically. The effects of concomitant elements and easily ionized elements on silver absorbance were also examined in detail. The ultrasonic nebulization was used for sample introduction, and a water cooling condenser with a concentrated H_2SO_4 desiccator was used for desolvation in our recommended system.The characteristic concentrations for silver obtained in this work were shown to be 0.01 and 0.03 μtg/ml at 328.1 and 338.3nm,respectively. The relative standard deviation for ten measurements of 1μg Ag/ml was 7.5％.