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- Article number: CO2L1100
- EAN / GTIN: 4260169963813
- Shipping weight: 0.12 kg
- Dimensions: 4.00 cm × 11.00 cm × 4.00 cm
The DRAK CO₂ long-term test solutions for 20 resp. 30 mg/l CO₂ can be used in any conventional CO₂ long-term test for the long-term measurement of the optimal CO₂ concentration. The continuous control of this most important plant nutrient is elementary for the well-being and growth of your aquatic plants. The control of the CO₂ concentration via an endurance test with our CO₂ endurance test solutions works completely independently of the aquarium water. It therefore has the advantage that no substances such as humic acids or phosphates can interfere with or influence the measurement.
- Depending on the system, fill 1 to 3 ml of the CO₂ long-term test solution into the long-term test
- Place the permanent test in a place with sufficient water movement in a way that it is well readable
- After 1 to 2 hours the equilibrium with the aquarium water is reached
- The green colour indicates the optimum CO₂ concentration of 20 resp. 30 mg/l - blue stands for too little, yellow for too much carbon dioxide
How it works
Nature does not like differences in concentration and compensates this by diffusion. Since diffusion takes time, the reaction of the long-term test lags somewhat behind reality. The test must therefore always be allowed the above-mentioned 1 - 2 hours reaction time after changes. Therefore, the CO₂ concentration of the test liquid of the long-term test is in equilibrium with the CO₂ concentration of the aquarium water via the air bubble between the two liquids.
The pH indicator bromothymol blue is used as the colorant of the test solution, which changes from blue (higher pH) to green and yellow (lower pH) at pH 6.6. The pH value of the test solution is influenced by the CO₂ concentration of the water in the aquarium. The carbonate hardness (buffer) of the test solution set during the preparation of the solution determines which pH is reached at which CO₂ concentration. This ensures that the solutions turn light green at the desired CO₂ concentrations of 20 or 30 mg/l, respectively.
The long-term test is therefore a useful instrument for controlling the content of carbon dioxide, which is essential for aquatic plants, with sufficient accuracy. Optimal growth is not possible without sufficient CO₂.