TURBIDITY & DETERGENTS

Measure biological parameters of the river Guadalquivir

Manuel González Gómez and Laura Gómez Briceño

Turbidity

Theoretical fundamentals

The turbidity is the expression of the optical property of the sample that causes that light rays are scattered and absorbed rather than be transmitted straight through the sample.

Materials

Protocol

1) Take 2 portions of river water without filtering, 10 ml each one.

2) In tube 1 pour a portion, cover and leave to stand.

3) In tube 2 other filtered portion is poured and left to stand.

4) Compare, after 15 minutes, the tubes 1 and 2.

5) It is valued according to the following table

Value table

TURBIDITY DISAPPEARS ----------------------Value

Decanting ----------------------------------------------7

Filtration -----------------------------------------------3

NO DISAPPEARS --------------------------------------0


Results

Nº STOP-------------------VALUE

Stop 1 -----------------------3

Stop 2 -----------------------3

Stop 3 -----------------------7

Stop 4 -----------------------7

Stop 5 -----------------------7

Stop 6 -----------------------3

Stop 7 -----------------------0

Stop 8 -----------------------0

Stop 9 -----------------------0

Big image

Conclusion

The turbidity increases in the zones near the cities and near the coast, where the turbidity doesn't dissapear

Detergents

Theoretical fundamentals

Detergents produce foam and they add phosphate to the water (eutrophication).

Materials

Protocol

1) In a jar of glass or translucent plastic poured 40 ml of water without filtering and it covered.

2) Shake strongly, during 5 minutes.

3) If appears foam, which lasts more 3s, will be positive in detergents.

Value table

Positive in detergents -----------------0

Negative in detergents ----------------6

Results

Nº STOP-------------------VALUE

Stop 1 -----------------------0

Stop 2 -----------------------0

Stop 3 -----------------------0

Stop 4 -----------------------0

Stop 5 -----------------------6

Stop 6 -----------------------6

Stop 7 -----------------------6

Stop 8 -----------------------6

Stop 9 -----------------------6

Big image

Conclusion

There is a high level of detergents in the zones near the cities

Resources