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Chapter+6+handout - Chapter 6 Sea water Chemistry 1 Surface...

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1 Chapter 6 Sea water Chemistry
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2 Surface Salinities of the world Principle of constant proportions
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3 Trace Elements • Trace elements occur in minute or trace amounts. Their concentration is parts per billion ppb, (e.g., μg/kg g/kg ) or lower – Despite their low concentration, some are very important for life thriving in the ocean (e.g., Fe, Zn ). Others may be considered pollutants (e.g., Pb, Hg ) – All elements on Earth can be found in seawater.
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4 Dynamic equilibrium Determining salinity • Salinometer – Sea water conducts electricity and the conductivity is proportional to the amount of salt • Conductivity-Temperature-Depth recorder – Can be lowered on a wire – Can be mounted on a buoy
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5 • Light refraction: –The bending of light in water is proportional to the density. The saltier the water, the denser it is; hence, the greater the light refraction. Determining salinity • Determine chlorinity and calculate salinity –Cl - is precipitated as AgCl.
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Chapter+6+handout - Chapter 6 Sea water Chemistry 1 Surface...

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