JBL TestLab Handbuch Seite 42

NO reagent 2:
3
Attention
H317 May cause an allergic skin reaction. H341 Suspected of causing genetic defects.
H412 Harmful to aquatic life with long lasting effects.
P101 If medical advice is needed, have product container or label at hand. P102 Keep
out of reach of children. P280 Wear protective gloves/protective clothing/eye protection/
face protection. P301+P310 IF SWALLOWED: Immediately call a POISON CENTER or
doctor/physician.
Hazard-determining component of labelling: m-phenylenediamine dihydrochloride.
Silicate Test SiO
Special features:
The JBL silicate test set SiO
saltwater within the range of 0.2 - >6 mg/l (ppm). Using the compensation method specially developed by JBL,
precise and reliable results can be obtained even in moderately discoloured water, e.g. caused by peat filters
and disease treatment. Any possible interference due to the presence of phosphates in the water sample are
eliminated by the delayed addition of reagent 2.
Why test?
Silicon is one of the most common elements in the world. As a result of the weathering of silicate rocks, silicon
is washed into surface and ground water in the form of silicate. Depending on the composition of the rocks in
a particular area, the mains water will contain varying amounts of dissolved silicate. Mains water can contain
up to 40 mg/l and, on rare occasions, even more. Silicate is non-toxic and there is no threshold set in the
regulations governing the quality of drinking water.
The significance of silicon for aquariums and garden ponds is as a nutrient for algae (diatoms), some aquatic
plants (e.g. hornwort) as well as siliceous sponges and many other invertebrates. When a new aquarium is set
up, the first sign of settlement is a brown coating of algae (diatoms). This coating disappears when the aquarium
is run in and sufficient competition from other algae and micro organisms has established itself. This also
significantly reduces the amount of silicate in the water. However, such coatings of algae can often reappear,
particularly in saltwater, after the water has been changed, adding new silicate. For this reason, osmosis water
should preferably be used when changing the water or filling a marine aquarium.
We recommend the following values:
Freshwater and garden pond water: up to approx. 1 mg/l to 2 mg/l can be tolerated.
Saltwater: max. 1 mg/l
Remedies for problems caused by increased silicate levels:
• Check the silicate content of the water used.
• Use water with low silicate content for partial changes of water (reverse osmosis, e. g. JBL Osmose 120).
• Filter through a silicate absorber (JBL SilikatEx).
Instructions:
1. Repeatedly rinse both test jars with the water to be tested.
2. Use the enclosed syringe to fill each of the test jars with 10 ml of sample water.
3. Add the reagent to one of the two test jars as follows:
a) 10 drops of reagent 1, shake, leave to stand for 3 minutes
b) 10 drops of reagent 2, shake, leave to stand for 3 minutes.
c) A small measuring spoon (narrow end of enclosed double spoon) of reagent 3, close lid and shake until
dissolved, leave to stand for 3 minutes
4. Place both test jars in the comparator block: the jar with the added reagent at the smooth end of the
comparator block, the jar with untreated sample water (blank sample) at the notched end of the comparator
block.
2
is for the measurement and routine control of the silicate content in freshwater and
2
40
UK