Problem 2. Consider the data for arsenic and mercury in the table below Remember

Question

Problem 2. Consider the data for arsenic and mercury in the table below Remember here that the units for the concentration ranges are "ppm in the coa which is mg per kg. Here, 1 ppm 1 part in 1 million by weight Obviously this is not the same as the ppm unit we have used for gas phase concentrations, which is fraction of the total gas pressure in parts per million. Use a spreadsheet to calculate the results a. What are the ranges for kg of As and Hg present per metric ton of coal? (simple unit conversion). b. Find some data for U.S. and China current coal use per year and use the result from part 1.a to estimate for each calculate the corresponding Totals (ranges) for the coal to be burned, in tonnes Hg per year for As and Hg. As an aside, note that Total amount removed from flu e gases amount emitted

Explanation / Answer

From table 1

Ranges of

As is 0.5-80ppm

Hg is 0.02-1 ppm

1ppm= 1mg/kg

0.5-80ppm = 0.5-8mg/kg

0.02-1 ppm = 0.02-1 mg/kg

1 kg of coal contains 1 mg of a substance

1000 kg( 1metric ton) of coal contains 1000mg( 1gram) of a substance .

Therefore 1 metric ton of coal contains

As= 0.5-80 grams

Hg = 0.02-1 grams

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