火焰原子吸收法测定空气与废气中的铅(铅尘和铅烟)

Determination of Lead in Air and Waste Gas by Flame Absorption Spectrophotometry

采用火焰原子吸收法监测空气与废气中气溶胶样品的铅尘和铅烟 ,依照有关部门已制订的一批统一 (或推荐 )的监测方法资料 ,通过自身一系列的方法适用性检验 ,经外场的采样效率试验直至实验室内的空白值、酸度及样品基体干扰影响和消除的尝试 ,加以改变仪器工作条件比对和回收试验等 ,使实测样品获得了满意结果。铅的方法检出限为 0 0 5 μg/mL/ 1 %吸收 ,测定下限为 0 1 5 μg/mL ,线性范围 0 5～ 1 0 0 μg/mL ,测定范围 :0 0 5～ 5 0mg/m3 ,当采样体积为 5 0m3 ,取 1 / 2张滤膜 (直径 8～ 1 0cm)进行铅尘测定时气溶胶中铅的最低检出浓度为 2× 1 0 - 4mg/m3 ,采样效率为 98% ,样品回收率为 92 3%。

The lead smoke and the dust of the sample of gas sol in air andwaste gas were monitored.In order to obtain satisfying rseults for the actual sample testing,freguently changing working conditions of the instruments and recovery experiment were studied by testing the actual sampling efficiency and examinating of disturbance, effects and elimination to the blank value,acidity and sample in laboratory.By this way,the sensitivity of lead is 0.05 μg/mL/1%,the prescribed minimum of determination 0.15 μg/mL,the linear scop 0.5～10.0 μg/mL;the lowest testing consistency 2×10 -4 mg/m 3,the sampling efficiency 98% and the rate of recovery of sample 92.3%.