Salinity is affected by weather, especially at the surface of the water.

During dry seasons, water evaporates, making salty water.

When it rains, salty water is diluted by the added fresh water. After a heavy rain, look for freshwater fish in normally saltier water. During a drought, saltwater fish may be found.

1. Use the pipet (0364) to add 5 drops of the sample water to the large round tube (0788).
2. Fill the tube to the 100 mL line with distilled or deionized water.
3. Fill the test tube (0106) to the 10 mL line with the diluted sample from Step 2.
4. Add one Chloride TesTab (3885). Cap tube and gently mix until the tablet has disintegrated.
5. Place the tube over the right-hand column of black circles on the color chart.
6. Compare the appearance of the circles through the tube to the circles in the left-hand column.
7. Record the result as ppt salinity.