23-27. A two-year old child plays at a playground that was one an industrial sit

Question

23-27. A two-year old child plays at a playground that was one an industrial site. The child plays on the site for 5 days a week for three years. Soil tests show that site soils con benzene (C6H6) at a concentration of 1.1 g/Kg. Assume The child ingested soil at 200 mg/day The average weight of the child during the 3-year period is 14 Kg. Carcinogenic potency factor for benzene 0.029 Kg-day/mg 1Kg = 1,000 g S.365-182 0.0 1 g 1000 mg 1 mg-1000 23. The total amount of benzene (ug) ingested over the 3-year peri a. 180 b. 120 d. 0.18 f other 1.2x108 24. The dose of benzene ingested during this is (in mg/Kg-day) a. 180 b. 120 e. 1.2x10-8 f.. other 1 . Co x 10-8 25. Chronic daily intake for the child (assume the average weight is 14 Kg over life time) a. 1.8x102 c. 1.2x108 e. 1.0x1010 d. 5x1010 f. other 26. What would be the CDI for an adult during the same exposure conditions a. 1.8x10-2 c. 1.2x10-8 e.1.0x10-10 b. 5x105 d. 5x10-10 f. other Assuming CDI of 1.5 x10-8 mg/Kg-da a. 4.35x10-8 27. t is the lifetime risk for the child 5x10-10 .93x10. e. 1.25x1012 d. 1.93x10-10 f. other

Explanation / Answer

Given

5 days/week benzene concentration = 1.1 ug/kg of soil

Intake = 200 mg /day of soil

for 3 years there are 156.5 weeks approximately

so no. of days = 5 * 156.5 = 782.5 days

Intake of soil = 200 mg /day * 782.5 days = 156500 mg = 0.1565 kg of soil

amount of benzene = concentration * soil weight = 1.1 ug/kg * 0.1565 kg = 0.18 ug  

Answer is 0.18 ug (d)

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