GEOS126 Lecture Notes - Lecture 6: Dissolved Load, Clay Minerals, Sea Spray
28 Nov 2018
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3. 5 by weight dissolved salt = about 35g in a kilo of seawater. Salinity varies hugely geographically and with depth. Absolute ratio may change but the relationships or the total amount does not change. Seawater has a ph of 7. 5 to 8. 5, it is slightly alkaline. Ph of seawater is relatively stable because it is buffered by co2. Seawater ph depends on carbon dioxide concentration. Components of seawater: solids, colloids, dissolved solutes, major constituents, trace components, gases. Concentration of dissolved constituents in seawater can be expressed by: weight, psu (grams per kilo, g/kg = parts per thousand (salinity, mg/kg = parts per million, ug/kg = parts per billion, mole/kg, volume, g/l, mg/l, ug/l, mole/l. 1. 027 kg values expressed by mass or volume are similar. Cl and na ions make up more than. Sum of all other 92 naturally occurring elements contributes to less than 0. 01% of total solutes.
