For practical reasons a 4mM secondary standard is to be made from the primary (2.5M) standard solution. What volume of the 2.5 M standard solution would you need to add and dilute in a 1 litre volumetric to make the 4mM secondary standard.
1.6 cm3
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A secondary standard solution (4mM) is to be used to make up working standards of 6, 12 20 and 24 uM in 500 cm3 volumetrics. What volumes of the secondary standard solution (4mM) would you add to the volumetrics?
0.75, 1.5, 2.5 and 3 cm3
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On average in what molar proportions do phytoplankton EXTRACT dissolved inorganic carbon, nitrogen and phosphorus from seawater?
106 : 16 : 1
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On average, what is the C:N ratio of phytoplankton?
6.6
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What is the definition of a bio-unlimited constituent
A constituent whose concentration in solution is unaffected by biological activity.
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Which process can be described as "The cellular process by which molecules are oxidized, releasing energy and liberating carbon dioxide as a waste product".
Respiration
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What happens to MOST of the biologically produced particulate matter that is produced in the upper, sunlit part of the ocean?
Most biological material is recycled in the surface waters
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In what situation does the rate of production of marine aggregates generally exceed the rate of disaggregation and/or consumption, leading to the occurrence of aggregates at the sea bed?
During seasonal blooms of phytoplankton
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Why is iron fertilisation a topic of great current interest?
Because it stimulates biological activity in regions with low phytoplankton growth but high nutrients, leading to a high export flux of carbon to the sea floor.
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If the oceans are in steady state the net input from rivers is balanced by material preserved in sediments. If the annual input of phosphate from rivers is 18.75 *109 mol yr-1, what amount of phosphate must be preserved in the sediments every year?
18.75 *109 mol yr-1,
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using the stoichiometric equation for respiration. In samples taken at different depths from below the euphotic zone, nitrate concentrations increase by 9.6M. Over the same depth, by how much would you predict the phosphate concentration to change ?
0.6 microM
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Where would you expect to find the highest concentration of nitrate in bottom waters?
North Pacific
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What is the average oceanic mixing time?
500 years
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Other cards in this set
Card 2
Front
A secondary standard solution (4mM) is to be used to make up working standards of 6, 12 20 and 24 uM in 500 cm3 volumetrics. What volumes of the secondary standard solution (4mM) would you add to the volumetrics?
Back
0.75, 1.5, 2.5 and 3 cm3
Card 3
Front
On average in what molar proportions do phytoplankton EXTRACT dissolved inorganic carbon, nitrogen and phosphorus from seawater?
Back
Card 4
Front
On average, what is the C:N ratio of phytoplankton?
Back
Card 5
Front
What is the definition of a bio-unlimited constituent
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