微波消解-火焰原子吸收光谱法测定烟灰中的铟

运用标准加入法于火焰原子吸收光谱分析，创新了测定烟灰中铟的方法．采用微波消解技术预处理烟灰样品，确定了消解液、微波消解压力、时间、温度等关键因素．采用三步微波消解工序，其消解温度、压力、时间依次为60℃、8atm、1min，70℃、13atm、2min，100℃、20atm、3min．实验结果表明，烟灰在逆王水和氟化铵中溶样效果最好，分析消解烟灰样品，相对标准偏差为0．43％-1．67％，加标回收率在102．3％～107．1％之间，结果令人满意．

Determination of Indium in Cigaretteashby AAS after Microwave Digestion

The cigaretteash samples were pretreated by microwave digestion technique, and the standard addition calibration technique was used in the flame absorption spectrometry（FAAS）, Consequently, a determination method of silver in cigaretteash was established. The key factors such as acid medium, pressure, time of microwave digestion were investigated. The results indicated that the sample dissolving in inverse aqua regia and NH4F was the best. The three-step microwave digestion procedure were adopted with digestion pressure, temperature and time： 60℃, 8 atm, 1 min; 70℃, 13 atm, 2 min; 100 ℃, 20 atm, 3 min. The proposed method was applied to the determination of cigaretteash sample. The relative standard deviation （RSD） were 0.43%-1.67%. The recoveries were 102.3%-107.1%.The results were satisfactory.