23-27. A t wo-year old child plays at a playground that was one an industrial si

Question

23-27. A t wo-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 contain 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 1 g 1000 mg 1 mg 1000 23. The total amount of benzene (g) ingested over the 3-year period is most nearly b. 120 d. 0.18 other a. 180 1.2x10 24. The dose of benzene ingested during this is (in mg/Kg-day): a. 180 b. 120 d. 0.18 e. 1.2x10 25. Chronic daily intake for the child (assume the average weight is 14 Kg over life time) a. 1.8x102 c. 1.2x10 d. 5x1010 other e. 1.0x1010 What would be the CDI for an adult during the same exposure conditions a. 1.8x10-2 c)1.2x 10-8 e. 1.0x10-10 26. b. 5x105 d. 5x1010 f. other 27. Assuming CDI of 1.5 x108 mg/Kg-da t is the lifetime risk for the child: a. 4.35x10-8 C)·93x 10-8 e. 1.25x10-12 5x10-10 d. 1.93x1010 other

Explanation / Answer

23-27. Ans

First calculate bezene in micrograms present in 200mg soil and then multiplied with total number of days for three years considering only 5days in a week.

So after doing these all the you will get is 0.18 micrograms

24. Ans is 1.6x10-8 so option is f

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