Bioaccumulation and HG Flashcards

1
Q

Bioconcentration

A

substance accumulates in
tissues faster than it is excreted from contact with water only

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2
Q

bioaccumulation

A

(exposure to water and food etc.)
result in an organism when a substance accumulates in
tissues faster than it is excreted

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3
Q

How Does Hg get into Water?

A
  • Burning of coal (atmospheric deposition);
  • Flooded land (dams/hydroelectric developments);
  • Metal refining – especially gold;
  • Historic contamination from industry – such as pulp
    and paper mills that used to bleach paper using
    chlorine. Mercury was used in the process and was a
    waste product.
  • In aquatic sediments, mercury is transformed to
    methyl mercury, which makes it bioavailable and
    toxic.
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