56-ME4211 - 1. Criteria on the Acidification The...

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1. Criteria on the Acidification The acidification of soil or water (decrease in pH) is a result of the emission of gases by industry, agriculture, power plants, burning of coal and road traffic . The emissions consist of, sulphur dioxide ( SO 2), oxides of nitrogen ( NO x ), ammonia ( NH3 ) and volatile organic compounds ( VOCs ). The above gases react with each other and are converted into other substances. The resulting substances include nitric acid ( HNO3 ), sulphuric acid ( H2SO4 ) and ammonia ( NH4+ ). They form aerosols which are known as " secondary particulate matter ". Exposure to these substances can result in damage to ecosystems and materials, as well as damage to human health. Oxidising agents necessary to convert the sulphur dioxide or nitrogen oxides to sulphuric or nitric acid: -ozone, hydroxide ions, or hydrogen peroxide, along with water. The chemical reactions in the atmosphere that convert SO2, NO x and VOCs to acidic compounds and associated oxidants , are shown in Figure 1
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Figure 4.8 Acid deposition: (a) Molecules from
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This note was uploaded on 12/07/2011 for the course ME ME4211 taught by Professor Dr.a.vyas during the Winter '11 term at NYU Poly.

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56-ME4211 - 1. Criteria on the Acidification The...

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