Problem 1: A woman living in a rural community grows collard greens. Unbeknownst to her, there used to be a road that abutted her garden, and it received significant tetraethyl-lead fallout from cars utilizing leaded gasoline. She moved to the property when she was 25 years of age. Calculate the average daily dose assuming the following: (1) she is now 38 years old, (2) she weighed 55 kg that entire time, (3) testing consistently shows that the lead concentration in the collard greens is 0.05 mg/kg, (4) she eats 2 servings of collard greens 3 days a week, and (5) one serving is 0.15 kg.
a. 2.5 x 10-5 mg/kg-day
b. 1.3 x 10-5 mg/kg-day
c. 5.0 x 10-5 mg/kg-day
d. 5.0 x 10-3 mg/kg-day
e. 3.9 x 10-5 mg/kg-day
Problem 2: A family is living next to an industrial plant where hydrogen sulfide is a byproduct that is released accidentally as part of normal operations. It is determined that the concentration at their house where they spend most of their time is 5 ug/m3. The family moved to the house 5 years ago. The oldest daughter (22 years old) spends 9 hours per day at the house. She spends 325 days a year at the house. What is the adjusted air concentration of hydrogen sulfide for the oldest daughter?
a. 2 x 10-2 mg/m3
b. 2 x 10-2 ug/m3
c. 2 x 10-3 mg/m3
d. 4 x 10-2 mg/m3
Problem 3: The DAevent for dermal exposure to chemical Y was determined to be 0.00145 mg/cm2-event. Workers use chemical Y in the field while temperatures are extremely hot. It is applied to their tools in their lap order to make sure they are clean and work correctly; however, there their lower legs are exposed because wearing long pants presents a heat hazard. Approximately 300 cm2 of surface area per leg is exposed and chemical Y accumulates on the exposed skin by the end of the day. What would be the absorbed average daily dose for a worker (70 kg) who works with chemical Y every day for 26 weeks a year 5 days a week for 25 years?
a. 3 x 10-3 mg/kg-day
b. 4.43 x 10-3 ug/kg-day
c. 4 x 10-4 mg/kg-day
d. 4 mg/kg-day
e. 4.43 x 10-3 mg/kg-day