The analysis of lead (Pb) in a sample of solder was carried out using atomic absorption spectroscopy as follows.
1.013 g of solder was completely dissolved in a small volume of nitric acid and the solution made up to 1.000 L with distilled water. A 50.0 μL aliquot of this was then diluted to 100.0 mL with distilled water, and when analysed by atomic absorption in an air/acetylene flame it gave an absorbance of 0.215 at 283.3 nm. The instrument was calibrated, after zeroing with distilled water, with standard solutions of lead containing 0.100 and 0.300 ppm Pb which gave absorbances of 0.120 and 0.360 respectively.
Calculate the wt % of Pb in the solder.