微波等离子体炬原子发射光谱法测汞的评价

Evaluation of Microwave Plasma Torch in Determination of Mercury by AES

本文采用超声雾化进样,以水冷凝和浓硫酸吸收结合去溶,以常压低功率Ar微波等离子体炬为激发源研究了汞的测定,讨论了各种实验条件对汞发射强度的影响,给出了方法的检出限、精密度和线性范围,并将其用于实际样品和标准样品分析,结果令人满意。

The microwave plasma torch (MPT) is evaluated in this paper as an excitation source for the determination of mercury by AES. The sample solution was introduced by using an ultrasonic nebulizer and a desolvation system with a water-cooling condenser and a concentrated surfuric acid desiccator. The experimental conditions and some factors such as microwave forward power, carrier gas flow rate, support gas flow rate, etc. , which influence emission intensity of mercury, have been optimized and discussed. It was shown that MPT discharge possesses high tolerance to the introduction of water sample and coexisting chemical species. The detection limit for mercury achieved by MPT-AES is comparable to or better than those reported by other methods. The method was used to analyse practical sample and a satisfactory result has been achieved.