JBL TESTLAB - Oxygen Test Set O₂; Special features; Why test?

34
GB
The instructions are repeated in a series of simple diagrams on the reverse of the colour chart.
Warning and safety notices:
Reagent pH test set 7.4 – 9.0
Attention
H226 Flammable liquid and vapour.
P102 Keep out of reach of children. P210 Keep away from heat/sparks/open ames/
hot surfaces. – No smoking. P233 Keep container tightly closed. P280 Wear protective
gloves/protective clothing/eye protection/face protection.
CO
2
For aquatic plants, CO
2
is the most important nutrient in a freshwater aquarium. Unsatisfactory plant growth is
usually caused by a lack of CO
2
in the aquarium. An adequate supply of CO
2
provides at the same time a favourable
pH level of about 7. As the levels of CO
2
, pH and carbonate hardness (KH) are directly related, the measure-
ments of pH value and carbonate hardness (KH) can be used to establish the associated CO
2
level from a table.
Remedies for unfavourable values:
CO
2
level too low: CO
2
fertilization with JBL PROFLORA CO
2
system
CO
2
level too high: Briey agitate or aerate the water, check and adjust setting of CO
2
fertilization
Determining the CO
2
level in freshwater using the pH value and the carbonate hardness:
If no substances which reduce the pH value (nitrate, peat etc.) are present in the water, the CO
2
level can be
calculated from the pH level and the carbonate hardness (KH). First measure the pH level and the carbonate
hardness (KH). Using the enclosed table, nd the line or column with the carbonate hardness or pH value
measured. The point at which the lines or columns intersect gives the value of the CO
2
level.
Oxygen Test Set O
2
Special features:
The JBL Oxygen test set O
2
is to measure and routinely check the oxygen content in freshwater and marine
aquariums, in mains water and garden ponds within the range of 1 – 10 mg/l (ppm).
Why test?
Oxygen is the “elixir of life” for all animal organisms. All animals in the aquarium and pond need oxygen to
breathe. But equally the “invisible helpers” in the aquarium and pond, the bacteria that break down pollutants,
depend on sufcient supplies of oxygen in order to be able to carry out their useful activities. Just like on earth
the supply of oxygen in the aquarium and in the pond needs to be guaranteed by the assimilation activities of
plant organisms (algae and higher plants). However, in aquariums and koi ponds without plants, or in marine
aquariums the oxygen supply can only be maintained by water movement and/or aerating e.g. by the use of
diaphragm pumps (ProSilent a-range).
The following levels are recommended:
In freshwater aquariums and non-planted koi ponds, the oxygen concentration should correspond at least to
the equilibrium value (gas equilibrium with the ambient air) that can be achieved at the current temperature.
This level should be approx. 8 mg/l at 25 °C. The levels for other temperatures are shown in the following table.
The colder the water, the higher the levels. Plants are capable of exceeding this equilibrium level by their
assimilation activity. Accordingly, it is not uncommon to nd levels which are 1 to 2 mg/l over the equilibrium
° C 4 6 8 10 11 12 13 14 15 16 17 18 19
mg/l O
2
12.7 12.1 11.5 10.9 10.7 10.4 10.2 10 9.8 9.56 9.37 9,18 9
° C 20 21 22 23 24 25 26 27 28 29 30 31 32
mg/l O
2
8.84 8.68 8.53 8.38 8.25 8.11 7.99 7.86 7.75 7.64 7.53 7.42 7.32