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River Contaminants

A Practical Look at Solubility. River Contaminants. A Practical Look at Solubility. River Contaminants. So Far:. - Math of Solubility. - Making Saturated Solutions. Determining Saturated Unsaturated Super Saturated. - % Saturation. A Practical Look at Solubility. River Contaminants.

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River Contaminants

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  1. A Practical Look at Solubility River Contaminants

  2. A Practical Look at Solubility River Contaminants So Far: - Math of Solubility - Making Saturated Solutions • Determining Saturated Unsaturated • Super Saturated - % Saturation

  3. A Practical Look at Solubility River Contaminants Classes of Contamination: - Heavy Metals - pH of water (Acids/Bases in the water - Gases What they are How we measure them

  4. Heavy Metals - elements between copper and bismuth on the periodic table - Densities greater than 4.0. (4X the Density of water) - trace amounts of some heavy metals are needed, but excessive levels can be toxic to the organism

  5. Heavy Metals Hg - mercury, Pb - lead and Cd - cadmium have NO known vital or beneficial effect on organisms, and their accumulation over time in the bodies of mammals can cause serious illness.

  6. Mercury

  7. Mercury • -manufacture of industrial chemicals • electrical and electronic applications • some thermometers • Metal refining • Wood Preservative (Lumber Industry) • CFL lightbulbs

  8. Mercury More and More Hg in the Efnvironment More and More Hg making its way into the food chain

  9. Mercury in fish Mercury - stored in the muscle tissues of fish, - fish-tissue concentrations increase over time. • can be particularly toxic to unborn or young children, - women who are pregnant or plan to become pregnant within the next one or two years, as well as young children avoid eating more than 6 ounces (one average meal) of fish per week - In the United States the FDA has an action level for methyl mercury in commercial marine and freshwater fish that is 1.0 parts per million (ppm)

  10. Toxic Effects; Mercury Exposure to any form of mercury on a repeated basis, or even from a single, very high exposure can lead to the disease of chronic mercury poisoning. There are three main symptoms: - 1.Gum problems: The gums become soft and spongy, the teeth get loose, sores may develop, and there may be increased saliva.

  11. Toxic Effects; Mercury - 1.Gum problems: The gums become soft and spongy, the teeth get loose, sores may develop, and there may be increased saliva. 2.Mood and mental changes. - Wide swings of mood, becoming irritable, frightened, depressed or excited very quickly for no apparent reason. - Hallucinations, memory loss and inability to concentrate can occur

  12. Toxic Effects; Mercury 2.Mood and mental changes. - Wide swings of mood, becoming irritable, frightened, depressed or excited very quickly for no apparent reason. - Hallucinations, memory loss and inability to concentrate can occur 3.Nervous system. The earliest and most frequent symptom is a fine tremor (shaking) of the hand. A tremor may also occur in the tongue and eyelids.

  13. Cadmium Cadmium is produced mainly as a byproduct from mining, smelting, and refining sulfide ores of zinc, and to a lesser degree, lead and copper. This element and solutions of its compounds are extremely toxic even in low concentrations, and will bioaccumulate in organisms Ingestion of any significant amount of cadmium causes immediate poisoning and damage to the liver and the kidneys. Cadmium poisoning is the cause of the itai-itai disease, which literally means "pain pain" in Japanese

  14. Itai - Itai Disease Toyama Prefecture. Japan Due to the cadmium poisoning, the fish in the river started to die. The rice absorbed the cadmium. The cadmium accumulated in the people eating contaminated rice. Bioaccumulation Concentration of the toxin in increased as it travels up the foodchain

  15. Facts. Cadmium The average soil in the US contains cadmium compounds 250 ppb (Parts per billion) Hazardous waste soils have concentrations as high as 4 ppm, water as high as 6 ppm In the US the average person consumes 30 micrograms of Cadmium per day but only absorbs 1-3 micrograms. Smokers double this intake due to the Cd in the tobacco Minimum drinking water safety standards allow 50 ppb

  16. Lead & Arsenic

  17. Acids and Bases Acids and Bases are two classes of chemicals that are highly reactive Common Bases Common Acids HCl Hydrochloric NaOH Sodium Hydroxide Nitric Acid Potassium Hydroxide HNO3 KOH Lithium Hydrroxide H(CH3COO) LiOH Acetic Acid

  18. Acids and Bases Acidity of a water sample is measured in pH Power of Hydrogen Scale goes from 0 - 14 0 - 7 Acidic 7 - 14 Basic EPA Drinking Water Requirements pH between 6.5 - 8.5

  19. Acids and Bases Acidity of a water sample is measured in pH EPA Drinking Water Requirements pH between 6.5 - 8.5 Fish Tolerate pH between 5 - 9

  20. Dissolved Oxygen

  21. Gases Even compounds that we consider essential to life can become a toxin If Oxygen saturation in the water becomes too low the organisms suffocate (DO < 60%) If the oxygen saturation is too high, again the substance becomes fatal (DO> 125%) Too high and air bubbles form in the blood stream, blocking blood vessels Oxygen can be found in water at saturations as high as 160%

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