Human exposure to bisphenol A (BPA) can occur through water sports in contaminat

Question

Human exposure to bisphenol A (BPA) can occur through water sports in contaminated rivers where the water levels can range from 5 to 1500 ng/L.  River sediment levels can range from 5 to 100 µg/kg of sediment.

BPA: MW 228; Melting Pt. 150 0C; log P = 4.04; pKa 9.5; water solubility = 125 mg/L at 25 0C

a. Compare the range of BPA concentrations in river water and sediment after convertingboth unit ranges to ppb. Note: 1 ppm =1 mg/kg solid or L of aq. solution. Comment on why there is this difference in level between water and sediment.

Explanation / Answer

5 to 1500 ng/L

ng = 10^-9 g

microg = 10^-6

so

1 microgram = 10^3 ng

5*10^3 to 1500*10^3 micrograms/L

note that microgram/L = ^ppb

Original range: 5000 - 1500000 ppb

River range: (since microgram/L = 1 ppb)

then

5 - 100 ppb

then

compare ranges:

Original range: 5000 - 1500000 ppb

River gane: 5 - 100 ppb

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