4) While cleaning up an old storage room, you found some old lead pipe corroding in the corner. The drain from the storage room fed into the water collection system. You have been tasked to determine how much lead has been released into the surface water pond. You take the sample and bring to the lab and run it through your AAS. Standard 1 at 2 ppm gave an absorbance of 0.064. Standard 2 at 5ppm gave an absorbance of 0.161 . Standard 3 at 10 ppm gave an absorbance of 0.317 . Your test sample had an absorbance of 0.140 . What is the concentration of lead