Pollution yearly flux

A barrel of 10 kg of methylchloride (CH3CI, a priority pollutant) was deposited many years ago at the bottom of a lake. Now it is 10 cm below the sediment surface and has begun to leak. What will be the concentration versus time and distance solution for this problem Plot the concentration profile after 20 years. How would you determine the flux of methylchloride into the lake ... 

Its average SO2 emission rate ( 4,000-5,000 Mg d b is similar to the total industrial sulfur flux from France (Allard et al., 1991) and must result in substantial elevations in tropospheric sulfate in southern Italy (Graf et al., 1998). It has been suggested that these emissions have caused pollution events in mainland Italy, and even that they have been responsible for deterioration of Roman monuments (Camufifo and Enzi, 1995). Etna also pumps an astonishing estimated 700 kg of gold into the atmosphere every year (Table 6). 

The monitored rainfall Zn content over background areas is between 10 and 40/zg/L, and in polluted areas these values are much higher. Giving the average content as 20/zg/L, Dobrovolsky (1994) estimated the global deposition flux as much as 2.3 X 10 tons/year. 

Scaling the measured Pb atmospheric flux in the region to the total atmospheric flux of metals over the past 100 years as determined in a salt marsh, the relative contributions of atmospheric and stream and sewage supply of metals to the Sound sediment can be estimated. In two cores so analyzed, all of the lead is inferred to be of atmospheric origin and about half of the copper and zinc. These proportions can be expected to vary westward along the axis of the Sound as local source terms from municipal and industrial pollution become more important. 

Table 6.1. Importance of atmospheric deposition as a source of nitrogen pollution to Chesapeake Bay under various assumptions. Fluxes are thousands of metric tons of nitrogen per year. Percentage values given in parentheses are percentages of total nitrogen load. The baseline run assumptions are from EPA (2003)...

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