Thanks for the help Prior to stratification, there is 8 mg/L of dissolved oxygen

Question

Thanks for the help Prior to stratification, there is 8 mg/L of dissolved oxygen in Lake Erie. Once stratification begins on June 1, how many days would it take for the DO to drop below 2 mg/L in the hypolimnion, if the decay rate constant is 0.16/d and there is no mixing with the epilimnion? What would the DO concentration be in the hypolimnion on July 1? 5. 6. 7. Once stratification ends in the fall and the full lake can mix and exchange oxygen with the atmosphere, 8. Atmospheric deposition of mercury occurs at a rate of 3mg/d/acre. What is the mercury concentration 9, If the inflow to the lake in problem #8 also contains mercury at a concentration of 12 ng/L, what would 10. What would be the mercury concentration in the lake from the problem above 5 days after atmospheric what DO would the lake achieve if temperature and biological reactions remained constant? in a 65 acre lake if water enters and exits the lake at 5 ft/s? be the lake concentration of mercury? (ng/L is nanograms per liter 1/1,000,000 mg/L) deposition was cut to 2 mg/d/acre?

Explanation / Answer

The average density of seawater is 1.027g/cm3.Thus 1 kg of seawater is equivalent to 1.00 g of seawater+1.027g/cm3=973.7cm3 of seawater.The concentration in parts per million by volume of seawater is 390*10-3 g/kg seawater*1.027*10-3 kg/cm3*1,000 cm3/l seawater=400.5*10-3 g/l=400.5ppmv of seawater

The atmosphere is an important reservoir that exchanges materials with the earth's surface.Its composition has changed on a geological time scale and on the human acale of generation because of the activities of human society.

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