For high precision determination of the potassium concentration in saltwater
Potassium is a vitally important macro-nutrient for all living beings. In natural ocean water, this alkali metal is present in an average concentration of 408 mg/l. In a saltwater aquarium, the potassium concentration is usually kept stable by regularly changing the water. Nevertheless, a lack of potassium can occur in individual aquariums tanks due to the use of zeolites and other adsorbents. One sign of a possible lack of potassium is clear discolouration of corals and retraction of polyps. The potassium level in a saltwater aquarium should be checked regularly to ensure that the level is between 380 and 420 mg/l.
With the high resolution titration test Tropic Marin®Potassium Test Professional the potassium concentrations can be determined reliably with a resolution of 5 mg/l.
• Accuracy: 5 mg/l
• For determining the K concentration in saltwater aquaria
• Sufficient for approximately 50 applications
• Incl. potassium standard to check function and shelf life of the test reagents
1. Determining the “correction value“:
1.1If you recently determined the correction value, then proceed to item 2 “Determining the potassium concentration”.
1.2 Shake all reagent bottles before use!
1.3 Place a clean syringe tip onto the 1 ml dosing syringe with green piston and draw up 1 ml of “Standard”. Ensure the dosing syringe is as dry as possible. Add the entire volume to one of the two cuvettes.
1.4 Now carry out the potassium measurement as described at points 2.3 to 188.8.131.52The correction value can now be determined using the table. To do so, read the corresponding potassium concentration of the residual volume of reagent D on the table. Subtract this value (measured potassium concentration) from the standard value 400 mg/l (concentration of the potassium standard). That is how to determine the correction value that you will use for the measurement values established later on.
1.6 The used glass cuvette, syringes, and syringe tips must be thoroughly cleaned after completing the actual potassium measurements.
2. Determining the potassium concentration:
2.1 Shake all reagent bottles before use!
2.2 Insert a clean syringe tip onto the 1 ml dosing syringe with the green piston, flush out the syringe several times with the water sample being tested (aquarium water) and then draw up 1 ml of this water. Empty the entire amount into the clean second cuvette.
2.3 Place a clean syringe tip onto the 1 ml dosing syringe with red lettering and draw out reagent A up to the 20 marking on the syringe (corresponds with 0.5 ml). Add the entire amount to the water sample. The exact completion of this step is very important for the precision of the final result!
2.4 Swirl the cuvette with the water sample for approx. 10 sec. to mix the reagent well, and then wait 5 minutes. White clouding will form.
2.5 Add 9 drops of reagent B, swirl for 10 seconds, and allow the cuvette to stand for another 2 minutes.
2.6 Next, add 3 drops of reagent C from the dropper bottle, and the water sample will turn to a yellow colour.
2.7 Place another clean syringe tip onto the third 1 ml dosing syringe with black lettering and draw out 1 ml of reagent D. Each time add three drops of reagent D to the water sample (CAUTION: Do not add, under any circumstances, a larger amount of reagent D all at once into the cuvette) and mix the reagent thoroughly by swirling it carefully. This is important so that a clear colour changing point is available later. Repeat this procedure until the yellow colour disappears and turns into a pale pink colour.
2.8 After that, continue carefully with the titration. After each drop of reagent D, the cuvette must be swirled until a rich, darker pink colour results after approx. 1 – 3 droplets. Read the remaining quantity of reagent D on the syringe.
Note: If you are unsure if the end point of the titration has been reached, then add one more drop of reagent D. If the colour intensity does NOT continue to increase, then the final point of titration has already been reached. In this case, add on the last drop (0.01 ml) to the remaining quantity (mathematically). At this point, if you come up with the determined correction value, continue with point 1.5. To determine the actual potassium level in your water sample, continue with your measurement at point 2.9.
2.9 The corresponding potassium concentration can now be read on the table using the residual volume of reagent D. Provided it has been determined previously, the correction value determined at point 1.5 is either deducted (negative value) from the potassium concentration or added to it (positive value).
2.10 If additional measurements are carried out immediately, then the cuvette(s) and the syringe with the green piston should be cleaned briefly using reverse osmosis water. After completing the measurement series, the glass cuvettes should immediately be cleaned thoroughly according to item 3 so that precipitation cannot adhere too severely.
3. Cleaning the glass cuvette and syringes:
After completing a test series, we recommend cleaning the used glass cuvettes, syringes, and dropper tips.
– The syringes and associated syringe tips must be flushed out thoroughly with reverse osmosis water and left to dry.
– Rinse out the glass cuvettes thoroughly with tap water. Clean the cuvettes with a piece of paper towel as best as possible, rinse thoroughly with reverse osmosis water, and leave them to dry. A light precipitation may remain. To remove this, we recommend using a suitable brush like the Tropic Marin® cuvette brush (available separately) or adding some household vinegar or vinegar-based cleaner. Allow the vinegar solution to sit for 12 -?24 hours, then rinse out the cuvette with reverse osmosis water and allow it to dry.
How to correct unfavourable values
To increase the potassium concentration in case of values that are too low, we recommend using Tropic Marin®Potassium to adjust the potassium level to the natural level again and to produce an increase in the vitality of diverse corals as well. If the potassium level in the water is too high, we recommend doing a partial water change.
Arrive Alive Guarantee Policy:
We have close to a 99% success rate on our livestock shipping due to our picking and packing techniques.
However, the unfortunate event that an item is dead on arrival you must follow the below procedure to prevent your claim from being declined.
- You must make contact with us via email within 2 hours of receiving your order. You do not need to call us as we are not always able to answer the phone immediately due to the nature of our work with our hands in water majority of the day.
- The email must contain a clear photo of the livestock in the original bag still sealed. The photo must be clear and show the entire bag.
This allows us to review your claim and refund accordingly. Due to the nature of your purchase, should you not make contact within 2 hours, refund claims will not be considered.
Once your claim has been processed a refund will be honoured for the cost of the item EXCLUDING the cost of postage within 72 hours.
Please note that the acclimatisation process and how the livestock settle into your aquarium is your responsibility as this is out of our hands. There are a number of factors out of our control such as
- Existing fish becoming aggressive towards your new additions
- Incorrect water parameters - PH / Ammonia / Nitrite Levels.
- Incorrect acclimatisation process carried out, introduced livestock too soon which will cause too much stress to the livestock.
Therefore we are unable to cover the livestock once they have been delivered and introduced into your aquarium.
Claims will NOT be considered if you miss delivery and your order is taken to the sorting office. Returns are not accepted on livestock.
DX offer a 'Change Your Delivery Date' HOWEVER, YOU MUST NOT CHANGE THE DELIVERY DATE OF YOUR LIVESTOCK ORDER. IF YOU DO YOU WILL VOID YOUR ARRIVE ALIVE GUARANTEE COMPLETELY AND NO CLAIM WILL BE CONSIDERED.
We strongly recommend that you quarantine any new additions before introducing to your main tank. As with any livestock, we cannot be 100% sure of their condition once they leave us, therefore you should always carry out your own quarantine process and monitor the livestock closely before you make the decision to introduce the livestock to your main aquarium.
As of the 1st May 2021, we will be issuing a credit code rather than a monetary refund, should a livestock item not arrive alive. You must still follow the procedure as normal which is stated in our policy, for your claim to be considered.
The credit code will be issued via email to the email address given on your order.
The credit code will be for the value of the livestock only (excluding postage costs)
This only applies if your item is covered by our Arrive Alive Guarantee policy.
The reason we have made this change is because our livestock prices are one of the cheapest across the industry and we want it to stay this way. We do not have any cover or insurance if an animal does not survive the journey to you, so in order for us to maintain our low prices we will now be offering credit notes instead of cash refunds.
If an item is out of stock at the item of packaging your order, we will issue a refund as we were unable to fulfil the item prior to dispatching.
Tank mate compatibility is crucial to a successful and healthy home aquarium. Incompatible species will increase stress in the tank which could result in disease and considerable loss. Use our compatibility charts as a guideline when selecting fish.
Remember, no guarantees can be made about the compatibility or incompatibility of any particular species of fish. Also, particular species within a group of fish vary in temperament and may not correspond with the guidelines below.
Proper acclimation is the key to successful introduction of new aquarium arrivals. The Floating Method is undoubtedly the most widely practiced method among hobbyists. However, a more exact method of acclimation provided by the Drip Method is required for fish, corals or invertebrates sensitive to sudden changes in water chemistry.
The reason why acclimation is necessary is simple: the chemical makeup of the water in which the aquatic life is packaged is different from your aquarium water chemistry (i.e. water temperature, pH, and salinity). Aquatic life such as fish, and especially invertebrates (including corals), are very sensitive to even minor changes in water chemistry. The goal of acclimation is to gradually introduce your new aquatic life to the water chemistry found in your aquarium at a controlled rate to avoid distress.
The acclimation process is complete when equilibrium is reached, where the temporary container housing new arrivals shares the same water chemistry as your aquarium, and your new arrival appears adjusted to these conditions. Since different species have varying levels of tolerance, different methodologies are required to control the rate of change experienced during the acclimation process.
We recommends employing the Floating Method or the Drift Method of acclimation. The Floating Method of acclimation, where aquarium water is added to the floating bag in 1/2 cup increments, is a great choice when acclimating most types of aquarium fish. However, for more sensitive fish, invertebrates, and corals, it is recommended to employ the Drip Method of acclimation. Keep in mind, no matter which acclimation method you choose, be sure to take your time and never rush the process.
The Drip Method is considered more advanced. It is geared toward sensitive aquatic life such as snails, corals, shrimp, sea stars and wrasses. You'll need a drip acclimation kit (sold separately) and must be willing to monitor the entire process. Gather a clean, 3- or 5-gallon bucket designated for aquarium use only. If acclimating both fish and invertebrates, use a separate bucket for each.
- Be patient – never rush the acclimation procedure. The total acclimation time for your new arrival should take no longer than two hours.
- Always follow the acclimation procedure even if your new arrival appears to be dead. Some fish and invertebrates can appear dead when they arrive and will usually revive when the acclimation procedure is followed correctly.
- Never place an airstone into the shipping bag or bucket when acclimating your new arrival. This will increase the pH of the shipping water too quickly and expose your new arrival to lethal ammonia.
- Keep aquarium lights off for at least four hours after the new arrival is introduced into the aquarium.
- Most invertebrates and marine plants are more sensitive than fish to changes in specific gravity. Please acclimate invertebrates to a specific gravity of 1.023-1.025 or severe stress or trauma may result.
- Some live corals produce excess slime when shipped. After the acclimation procedure is followed, hold the coral by the rock or skeletal base and gently shake the coral in the shipping bag before placing into the aquarium. To avoid damage, please remember never to touch the "fleshy" part of a live coral. Many species of coral will not open for several days after introduction into their new home.
In some instances, a new tank mate will be chased and harassed by one or all of your existing tank mates.
Solution 1: A clean plastic spaghetti strainer (found at a local store) can be used to contain a tank bully within the aquarium for several hours until the new arrival adjusts to its surroundings. Just float the perforated plastic basket in the aquarium. Net the tank bully and place in the floating basket for approximately four hours while the new arrival adjusts to your aquarium. Never place the new arrival in this basket; the new specimen must get familiar with your aquarium. By placing the tank bully in a perforated basket, you’ll reduce the stress on the new arrival.
Solution 2: A perforated plastic lighting grid can be purchased at the local hardware store to cut down the width of your aquarium. This grid may be used to section off a small portion of the aquarium to separate territorial or aggressive fish from the newest tank mate.
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