Chapter 1, Problem 77QAP

An average adult breathes about $8.50\times {10}^3$ L of air per day. The concentration of lead in highly polluted urban air is $7.0\times {10}^{-6}$ g of lead per one m3 of air. Assume that 75% of the lead is present as particles less than $1.0\times {10}^{-6}$ m in diameter, and that 50% of the particles below that size are retained in the lungs. Calculate the mass of lead absorbed in this manner in 1 year by an average adult living in this environment.