Bedienungsanleitung Velda AQUA TEST (Seite 37 von 40) (Deutsch, Englisch, Holländisch, Französisch)

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NH3/4

USER INSTRUCTIONS PROFESSIONAL AQUA TEST

GENERAL

With the help of the Velda NH3/4 Test the ammonium / ammonia content of fresh and salt water can

be determined quickly and quite accurately. Both for garden ponds and for aquaria it is important to

have an insight into the ammonium / ammonia content of the water. Nitrogen compounds can be

present in water in many forms. It can be distinguished between organic and inorganic nitrogen

compounds. The organic compounds consist for the major part of proteins and amino acids. The

proteins are the basic material for the inorganic compounds, namely ammonium (NH4), nitrite

(NO2) and nitrate (NO3). The conversion of proteins into the ultimate nitrate is referred to as the

nitrification process. It occurs with the help of the nitrosomas and nitrobacter bacteria and is strictly

aerobic. This means that the process only starts under oxygen rich conditions. If inorganic ni-

trogen compounds are present in the water environment in high concentrations, this suggests

seriously water pollution, which may result in death of fish.

The ammonium and ammonia compounds are in a certain ratio to each other. This ratio is con-

trolled by the pH level. At a low pH level the ammonium part is much larger than that of ammonia,

whereas at a high pH level, the ammonia part will become larger. A correct determination of the

ammonium and ammonia content consequently is only possible if the pH level is known. For pond

fish ammonium is a relatively harmless compound. Ammonia, however, at a concentration of

0.2 mg/l, is already fatal for spawn and at 0.8 mg/l it is for all fish.

INSTRUCTIONS FOR USE

Rinse the graduated beakers well and fill them with 5 ml of water to be tested. To one graduated

beaker add while shaking slightly 1 drop of NH3/4 test liquid no. 1, followed by 5 drops of NH3/4 test

liquid no. 2, subsequently 1 drop of NH3/4 test liquid no. 3 and finally 5 drops of NH3/4 test liquid no. 4.

At each addition swirl slightly. Now close the graduated beaker with the cap and shake well. Take

the cap off the graduated beaker. Shift the colour chart in the comparator and place the graduated

beakers in the holes that are destined for them. Place the beaker containing the test liquid in the in-

nermost opening of the comparator. Wait for 4 minutes. Now turn the colour chart until both beakers

are showing the same colour when looking from above. The similar colour indicates the ammonium/

ammonia content in mg/l. Determine the colour by daylight, however, not right in the sun. After use

rinse the graduated beakers well. Determine the pH value, with the help of the Velda pH test

(not supplied along). As soon as this value is known, the ammonia content can be read with the

help of the table. This test practically has an unlimited shelf life, provided that it is kept cool and dark.

Keep away form children.

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