Abstract: In order to solve the problem that the emission intensity of the traditional temperature-controlled cyclone atomization system ICP-OES varies greatly for different forms of organosilicon compounds, the ultrasonic atomization direct injection system was adopted, which can send all the silicon elements in the sample into the ion chamber for detection. The influencing factors of the ultrasonic atomization direct injection ICP-OES method, such as instrument power, diluent, physical properties of blank diesel fuel, dilution ratio, etc., were tested and analyzed, and a suitable method for the detection of silicon content in diesel fuel was obtained. The recoveries of this method ranged from 93.3% to 108%, the detection limit was 0.16 μg/g, and the lower limit of the method was 0.64 μg/g. The results showed that the ultrasonic atomization direct injection ICP-OES method is suitable for the determination of silicon in diesel fuel.

Key words: ultrasonic atomization, ICP-OES, direct injection system, silicon, diesel