Vitamin B12 could trigger outbreaks of acne, scientists have today warned. The essential nutrient, found in meat, fish, eggs and dairy products, as well as in Marmite, alters the activity skin bacteria. This leads to unsightly spots and pimples in susceptible people, a new study found.
Sulfur dioxide, SO2, is a colorless gas or liquid with a strong, choking odor. It is produced from the burning of fossil fuels (coal and oil) and the smelting of mineral ores (aluminum, copper, zinc, lead, and iron) that contain sulfur. Sulfur dioxide dissolves easily in water to form sulfuric acid. Sulfuric acid is a major component of acid rain. Acid rain can damage forests and crops, change the acidity of soils, and make lakes and streams acidic and unsuitable for fish.
Sulfur dioxide can react with the hydroxyl radical to form an HSO3 radical, which can react with another hydroxyl radical to form water and SO3 or H2SO4 . Sulfur dioxide also dissolves in water droplets where it can react with oxygen gas to form SO42-. The third pathway to sulfate is when sulfur dioxide reacts with hydrogen peroxide to sulfuric acid as shown in Figure 37.3. Figure 37.4 Reaction of sulfur dioxide with hydrogen peroxide to form sulfuric acid.