USP中富马酸铁有关铅的检验？？（好像是分光光度计与光散射法）

Procedure— Concomitantly determine the absorbances of the Blank, Standard solution, and Test solution at the lead emission line at 283.3 nm with a suitable atomic absorption spectrophotometer (see Spectrophotometry and Light-scattering 851) equipped with a lead hollow-cathode lamp and an air–acetylene flame, using the blank to set the instrument to zero. In a suitable analysis, the absorbance of the Standard solution and the absorbance of the Blank are significantly different: the absorbance of the Test solution does not exceed that of the Standard solution (0.001%).

什么意思？怎么操作？

谢谢！！^-^