测定废气中的铅时微波消解玻璃纤维滤筒后3种样品处理方式比较

采用原子吸收分光光度法测定固定源污染废气中的铅时,微波消解玻璃纤维滤筒后,按照直接稀释、赶酸、加硼酸3种方式处理样品进行测定,比较了这3种处理方式的操作性和测定结果的准确性。玻璃纤维滤筒空白样用直接稀释、赶酸、加硼酸3种方式处理,测定结果分别为0.56,0.25,0.21 mg/L,加标回收率分别为84%,95%,85%。直接稀释定容测定,方法简便,但准确度较低;赶酸后测定,方法准确度高,但耗时长。

Comparation of Three Processing Ways for Microwave Digestion Glass Fiber Cartridge as Determining Lead in Pollution Emission

Lead in stationary pollution emissions was determined by atomic absorption spectrophotometry. Samples were pretreated by direct dilution,driving acid,adding boric acid three ways after microwave digestion of glass fiber filter tube. The accuracy and operation of three pretreatment methods were compared. The blank value of the three pretreatment methods were 0.56,0.25,0.21, respectively, and the recoveries were 84%, 95%,85%, respectively. The direct dilution method is simple, but its accuracy is lower. The driving acid method has higher accuracy, but it needed long time.