intro aquatic chem Flashcards

1
Q

what is the relationship between sedimentation
and flushing rate

A

its inverse: the greater the flushing rate, the less likely particles are to sediment, the slower the flushing rate - greater the importance of sedimentation in the system

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2
Q

water residence time

A

the average amount of time that a water
molecule will spend in a particular lake, is the reciprocal of the flushing
rate

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3
Q

Interstitial water

A

water between particles in the sediment.

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4
Q

what size of sediment particle will have the greatest effect on the water chemistry

A

Finer sands and small
particles of organic matter will have a much greater influence on water
chemistry of not only the interstitial water, but on the overlying water as
well

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5
Q

features that all sediments have in common

A

-They are relatively solid and unmixing;
* Have bacteria associated with them (bacteria attach to any particle)
* The bacteria will decompose organic matter releasing CO2, phosphate,
ammonium ions (then nitrite and nitrate)

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6
Q

what is a redox reaction

A

reaction that involves the transfer of electrons

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7
Q

what does OIL RIG stand for in terms of redox reactions

A

OIL = Oxidation Is Losing electrons
RIG = Reduction Is Gaining electrons

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8
Q

what is redox potential

A

Redox potential is measured with a
meter that measures the availability of
transferable electrons relative to the
ability of electrons in hydrogen gas and
is read in millivolts

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9
Q

what does a high or low redox number indicate

A

Low values (below
100 or even negative) mean there are large numbers of transferable electrons = a reducing environment. A high redox number indicates few transferable electrons = an oxidizing environment

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10
Q

biogeochemistry

A

large scale
chemical cycles that include living organisms and large scale abiotic reservoirs.

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