Measurements of abiotic factors in the aquarium


1.Teperatur

Measure the temperature at 3 places in the aquarium, in which you expect maximum differences.

A special water thermometer brings us the following results:

1.water surface: 17°C
2.middle of the water: 17°C
3.Water surface: 17°C

2.Light

Measure the incident light directly under the HQI light.
We measure with a photosensor at four different places
Result:
1. directly at the lamp 110850 lux
2. Environment (direction room light) 280 lux
3. of the window 700 lux 4. at the water surface 330 lux.

3.PH value:

Measure the pH value of the aquarium water:
Result: pH = 7,6 4.

4. Oxygen content:

Measure the exact oxygen content of the aquarium water:
Result: 9,1mg O2/l 5.Karbonathardens

Measure the Karbonathardens of the water:

We measure with Teststrip

Result: 6°d od. 1068mg/l (CaCO3)

How do the relationship formulas read?
Carbon dioxide: CO2
Hydrogencarbonate ion: HCO3

How does the pH value of the concentration of solved carbon dioxide depend? (Reaction equation)

By following connections and reactions in the water:

CO2 + H2O = H2CO3 H2CO3 + H2O = HCO3 + H3O+

6.Nitrogen compounds:


Measure the concentration of the following nitrogen compounds:

We use respective test sticks to measure.

Nitrite: 0,02mg/l
Ammonium: defective test sticks
How do the relationship formulas read?
Nitrate ion: NO3
Nitrite ion: NO2
Ammonium ion: NH4+


7.Connections of the phosphorus

Measure the concentration of the phosphate in the aquarium water:
3mg/l

We use phosphate test sticks to examine.

How does the relationship formula of the phosphate ion read?
= PO43