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Salinity Protocols

What is Salinity. The relative concentration of dissolved salts, usually sodium chloride in a given water sample.Measured in parts per thousand (ppt or PSU ? Practical Salinity Units)Tidal Fresh 0 - 1 ppt, tidal influence Oligohaline 2 - 5 ppt (slightly brackish) Mesohaline 8 - 15 ppt (brackish)

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Salinity Protocols

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    1. Salinity Protocols PBL Module Portsmouth Public Schools Hampton University

    2. What is Salinity The relative concentration of dissolved salts, usually sodium chloride in a given water sample. Measured in parts per thousand (ppt or PSU – Practical Salinity Units) Tidal Fresh 0 - 1 ppt, tidal influence Oligohaline 2 - 5 ppt (slightly brackish) Mesohaline 8 - 15 ppt (brackish) Polyhaline 18 ppt and up (salt water)

    3. Methods of Determining Salinity Evaporation Specific Gravity/Density Refraction Conductivity Titration (argentometric method)

    4. Evaporation Ratio of mass of salts to mass of water and salts. Expressed in PPT/PSU

    5. Specific Gravity/Density Use of a hydrometer SG of fresh water 1.000 As salt is added the SG will increase.

    6. Refraction Based upon the refraction index of light passing through a prism. Refractometer Direct reading scale in PPT o/oo. Temperature correction

    7. Conductivity Pure water is a poor conductor of electricity. Dissolved ions of salt increase the conductivity. Amount of electrical current is proportional to concentration of dissolved ions. Conductivity meter Salinomenter CTD

    8. Titration Chemical reaction usually using silver nitrate NaCl + AgNO3>>>NaNO3 + AgCl Silver Chromate is color indicator. Roughly S (in PPT) = 1.80655 x Cl (in PPT)

    9. End of Salinity Protocol PPT

    11. Continue your salinity protocols.

    12. Lafayette River Bridge – 1 meter

    13. Lafayette River Bridge – 4 meters

    14. Lafayette River Bridge – 6.5 meters

    15. Zowie! Right on the nose! Well within our tolerances!

    16. Oh No! Think you might have measured a bit too high! Try again.

    17. OOPS! It appears you are a tad low.

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