Manual Velda AQUA TEST (page 36 of 40) (English, German, Dutch, French)

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NO3GB

USER INSTRUCTIONS PROFESSIONAL AQUA TEST

GENERAL

With the help of the Velda NO3 Test the nitrate 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 nitrate content of the water. Nitrate is the last phase in the nitrification process. With the

help of micro-organisms organic components are converted through ammonia and nitrite in nitrate.

Nitrate is a primary nutrient, which is absorbed by plants and algae.

In a duly functioning water environment (aquaria and garden ponds) the nitrate content will be low

(less than 5 mg/l) or not detectable at all. Owing to certain factors, however, the nitrate content may

increase. That will certainly be the case if plant growth is stagnating or if there are many fish in pro-

portion to the quantity of water. If, under these circumstances also a large amount of organic com-

ponents are present in the environment, the nitrate level will very quickly exceed admissible levels

(for salt water aquaria this level is 2 mg/l).

Although nitrate is not as poisonous as nitrite, regular inspection of

its level is desirable.

0 - 1 mg/l normal value for a healthily functioning water environment.

2 mg/l the present are not able to fully absorb the nitrate present.

This situation may result in algal growth. Add more water

plants and remove any died off and organic components.

Regular inspection is desirable.

5 - 10 mg/l Absolutely take measures. Remove dirt on the bottom and

refresh part of the water.

INSTRUCTIONS FOR USE

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

beaker add one spatula of reacting powder no 1. Shake well during 15 seconds. Subsequently add

5 drops of NO3 test liquid no 2, followed by 5 drops of NO3 no 3. 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 innermost 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 nitrate content in mg/l. After use rinse the graduated beakers well.

The speed at which any discolouration will develop, depends on temperature. Wait for at least 5

minutes with the judgement of water having a temperature below 20 ºC. This test practically has an

unlimited shelf life, provided that it is kept cool and dark. Keep away form children.

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Velda AQUA TEST Manual

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