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The reagents used in the ozone aging test must be of analytical grade, and the ozone aging tank should be filled with distilled water throughout the testing process.
First, prepare the starch indicator solution: dissolve 1 gram of soluble starch in 40 mL of cold water while continuously stirring. Heat the mixture until it reaches a boil and ensure the starch is fully dissolved. Then, dilute the solution to approximately 200 mL using cold water. Add 2 grams of zinc chloride crystals, allow the solution to clarify, and decant the supernatant for use. This solution should be replaced every two or three days if stored and frequently used. Alternatively, you can prepare a fresh solution by dissolving 1 gram of soluble starch in 100 mL of boiling water. Regardless of the method used, add a few drops of 10% acetic acid to the solution before performing titration.
Next, prepare the standard iodine solution: place 2 grams of potassium iodide (KI) into a weighing tube and add 10 mL of water. Weigh the tube, then add iodine to the solution on the balance pan until the total weight of iodine in the solution is approximately 0.1 grams. Accurately measure the amount of iodine added and transfer the solution to a beaker. Rinse the weighing tube with distilled water and pour the rinse into the beaker. Transfer the entire solution to a 1000 mL volumetric flask, and dilute to the mark with distilled water. Store this solution in a tightly sealed brown bottle in a dark location, as it remains stable under these conditions.
For the sodium thiosulfate solution: weigh approximately 0.24 grams of sodium thiosulfate pentahydrate (Na₂S₂O₃·5H₂O) and dissolve it in 1000 mL of distilled water. This solution should have the same concentration as the standard iodine solution. However, due to its tendency to degrade over time, it must be standardized on the day of the test against the iodine solution.
To determine the concentration E of the sodium thiosulfate solution, use the formula:
E = (F × C) / S
Where:
- F = volume of iodine solution used (in mL),
- C = concentration of iodine (in mg/mL),
- S = volume of sodium thiosulfate solution used in titration (in mL).
Prepare a potassium iodide solution by dissolving about 20 grams of pure KI in 2000 mL of water. Also, make a 10% acetic acid solution by mixing 10 mL of glacial acetic acid with 90 mL of distilled water.
These reagents are essential for accurately determining the ozone concentration in the aging tank. If you want to learn more about ozone aging tanks and their applications, feel free to visit our website for more detailed information.
