Seawater Composition and Salinity

The wire loop was immersed in the solution with the decanted supernatant from the precipitation experiment. This ring is caught in a flame by the Bunsen burner and heated until a flame occurs. The presence of a bright yellow flame confirmed the presence of Na +. The cobalt glass was used as a filter, the ring was inspected, and since purple flame was present, K + was also shown to be contained in the supernatant. NH + Test This test was conducted using the original solution to avoid contamination of the ammonium salt by other procedures.

In 2010, a new standard of sea water characteristics called Seawater Thermodynamics Equation 2010 (TEOS - 10) was introduced. This standard contains a new scale called the reference bound salt scale. The absolute salinity of this grade is expressed as the mass fraction expressed in grams per kilogram of solution. Salinity concentration on this scale is determined by combining conductivity measurements with other information that can explain the regional change in seawater composition. They can also be determined by direct density measurement.

Standard sea water is currently considered the same physical artifact as the standard seawater combination. The reference salt concentration is then assigned to a reference composition salt concentration scale on a particular sample of standard seawater. The reference salinity is numerically different from the actual salinity of the sample (Figure 1b), but can be derived from the actual salinity based on the conductivity using a simple ratio. However, the reference salt concentration can also be estimated using other methods (eg by direct measurement of density and reversal of the TEOS - 10 state equation).

Next, a numerical reference salt (denoted SR) is defined, which is indicative of the mass fraction of solute in seawater of the reference composition. The reference salt is determined by having gram units of solute per kilogram of seawater, multiplying the concentration of various components of the reference composition by its atomic weight, and then summing up. The salt concentration defined in this way is said to be on the reference composition salt concentration scale. Please note that the uncertainty of the atomic weight itself leads to an uncertainty of about 1 mg / kg in the definition.