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Arsenic, a naturally occurring chemical element, is currently used primarily in the production of pe

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Arsenic, a naturally occurring chemical element, is currently used ... Odorless, tasteless. Naturally occurs in rocks, soil, water, air, plants and animals ... – PowerPoint PPT presentation

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Title: Arsenic, a naturally occurring chemical element, is currently used primarily in the production of pe


1
Arsenic Facts
  • Arsenic, a naturally occurring chemical element,
    is currently used primarily in the production of
    pesticides and wood preservatives. In some
    areas, levels of arsenic are increasing in ground
    water supplies because of seepage from hazardous
    waste sites. In the past, arsenic compounds were
    used for the treatment of certain diseases. This
    practice has been discontinued because of an
    awareness of arsenics negative effects and
    because of the development of safer drugs.
  • Throughout the world, arsenic in ground water
    often comes from natural sources such as bedrock.
    The highest natural concentrations of arsenic in
    the United States are found in the Southwest, the
    Northwest, Alaska, and other areas near
    geothermal activity. Arsenical pesticide runoff
    also produces elevated arsenic levels in
    groundwater.
  • Additional Facts
  • Odorless, tasteless
  • Naturally occurs in rocks, soil, water, air,
    plants and animals
  • The average daily arsenic intake in adults is
    0.5-1.0mg.
  • In 2001, the EPA revised the regulation for
    arsenic in drinking water to lower the maximum
    allowable level from 50 parts per billion (ppb)
    to 10 ppb. The new standard became effective on
    January 23, 2006. The EPA estimates that more
    than 90 of the systems affected by the revised
    rule are small, serving population of 3,330
    people or less.
  • The EPA standards for arsenic in water is 10 ppb.
    Ten parts per billion (ppb) of arsenic in water
    means that there are 10 molecules of arsenic for
    every 999,999,990 molecules of water. That is
    roughly equivalent to a few drops of ink in an
    Olympic-sized swimming pool.
  • The adverse properties of arsenic compounds, or
    arsenicals, have been known for more than 2000
    years.
  • Ingested arsenic is quickly absorbed through the
    stomach and intestines. It then enters the blood
    stream
  • Two types of arsenic poisoning acute and chronic
  • Acute poisoning occurs when a person ingests
    large quantities of arsenic at one time.
    Symptoms include the irritation of the digestive
    tract, leading to pain, nausea, vomiting,
    diarrhea, or causing a pins and needles
    sensation in the feet and hands. Can lead to
    shock, coma, and/or death
  • Chronic poisoning occurs over a longer period of
    time. Symptoms include non-cancerous skin
    lesions, tingling/numbness of the soles and palms
    that develops into a painful condition called
    neuritis (swelling that causes impairment or loss
    of reflexes)
  • Chronic poisoning is believed to occur when a
    person has been exposed and accumulated gt150 ppb
    of arsenic. Twenty or thirty years after
    exposure to 500 ppb of arsenic, internal cancers
    (lung, kidney, liver and bladder) appear among
    10 of all exposed.
  • Treatment is available and complete or partial
    recovery is possible within a couple of months.

Arsenic level below 10 parts per billion
(ppb)This water is safe to drink and use for
food preparation. Arsenic level between 10 parts
per billion (ppb) and 500 parts per billion
(ppb)Do not drink your water or use it to
prepare foods that require a lot of water (e.g.
infant formula, soups, Jell-O, rice, coffee, tea)
if the arsenic level is above 10 ppb.  Washing
foods and dishes in the water is safe, and is not
a significant source of exposure. Continued use
of water above 10 ppb puts an individual at risk
for developing chronic arsenic poisoning. Arsenic
level above 500 parts per billion (ppb) Stop
using your water for any use.  Do not use water
even for showering, bathing, or flushing toilets.
Exposure to gt500 ppb puts and individual at risk
for developing acute arsenic poisoning.
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