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water pollutents

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jessica stelle

on 27 April 2010

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Transcript of water pollutents

Jessica stelle and rachelle freidhof water pollutant How can mercury get into your drinking water? It can be carried by wind and rain, found throughout environment mostly due to the:
realease of naturally occurring mercury from rock and soil.
burning of coal and oil that contains small amounts of mercury.
release of mercury from metal smelters
and incineration of meaterials that contain mercury, such as batteries Inorganic mercury compounds are the most common forms of mercury found in drinking water. Organic mercury compounds are rarely found in drinking water. Ways that mercury can get into your drinking water! =( Rain and snow can carry mercury from the air into surface water supplies such as lakes, rivers, and reservoirs.
It can seep into underground water supplies from industrial and hazardous waste sites. Improperly disposed household products, such as mercury containing outdoor paints, can move through the soil and reach private well and water supplies.
Past applications of mercury-based pesticides on agricultural lands, suc as farms and fruit orchards, can wash into nearby surface waters or travel through the soil into underground water supplies Dangers of mercury To much mercury in the human body can cause serious damage to the brain, nervous system causeing symptoms such as irritability, nervousness, changes in vision or hearing and difficulties with memory it also affects the kidneys!
Young children and developing fetuses are at the greatest risk of the harmful effects of mercury. How will mercury be detected and removed from drinking water? The EPA requires water suppliers to collect water samples once and analyze them to find out if mercury is present above 2ppb.
If present above 2ppb, the system much continue to monitor the contaminant every 3 months. If contaminant levels are found to be consistently above the MCL, the water supplier must take steps to reduce the amount of mercury so that it is consistently below 2ppb
Treatment Methods coagulation/filtration
cranular activated carbon
lime softening
reverse osmosis If you have a private well, you can get your water tested by a private labortory listed in telephone directory.
NJDEP recommends special copper-zinc filter for inorganic mercury in private wells
in some situations, a deeper well or a hook-up to a clean public water supply may be the solution EPA Method 1631 for measureing mercury level An aqueous sample is oxidized with bromine monochloride and sparged with nitrogen onto a gold trap.
The mercury is thermaly desorbed from the gold trap into a cold vapor atomic flourence spectrometer.
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