A. Unit conversions (5 points) 1. Units of measure used to express

QUESTION

A. Unit conversions (5 points) 1. Units of measure used to express chemical or radiation levels in the natural environment: Units Place in correct descending order according to mass (highest to lowest): Gram Femtogram Microgram Milligram Picogram Kilogram Nanogram 2. How many femtograms are there in a milligram? 1000000000000 3. Which of the following represents the lowest concentration of a chemical? A. 2 mg/L B. 4 ng/L C. 8 mg/mL D. 5 g/mL 4. Which of the following represents the highest concentration of a chemical? A. 8.5 x 10-2 mg/L B. 3.0 ng/M3 C. 0.25 mg/M3 D. 3.5 x 10-5 g/L 5. Environmental Exposures are expressed in terms of unit of mass per unit volume. In the following provide the quantified intake units for the following media: Air: Water: Food: B. Risk Assessment of Non-carcinogenic Agents (5 points): 1. Given a NOAEL of 1000 mg/kg-day, based on a long-term chronic animal study, the ADI (mg/kg-day) would be _____________. 2. Given a LOAEL of 1000 mg/kg-day, based on a long-term chronic animal study, the ADI (mg/kg-day) would be __________________. 3. Given a LOAEL of 1000 mg/kg-day, based on a subchronic animal study, the ADI (mg/kg-day) would be ____________. 4. Given a LOAEL of 1000 mg/kg-day, based on an epidemiology study, the ADI (mg/kg-day) would be __________. 5. Given the data in the following table, what are the values for: a) NOAEL __________ b) LOAEL __________ Dose Number deaths/exposed animals 0.5 mg 1.0 mg 1.5 mg 2.0 mg 3.0 mg 3.5 mg

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