FAAS Determination of Lead in Waste Gas

The blank filtering cartridge was rinsed with dil. HNO3 to eliminate lead ion,then used to absorb waste gas. The above filtering cartridge was digested by three different methods,including microwave assisted digestion,acid digestion method and Soxhlet extraction,and the solution obtained was determined by FAAS. Microwave digestion was chosen by comparing the values recovery of the 3 digestion methods. Linear relationship between the values of absorption and mass concentration of lead was kept in the range of 0.5-5.0 mg·L-1,with the values of recovery found by standard addition method in the range of 93.0%-96.2%.