During the digestion process, the oil sample should be carbonized at a low temperature for a specific duration before gradually increasing the temperature for boiling digestion. If the temperature is too high, the sample may overflow, leading to inaccurate results. To ensure complete digestion, the solution should be kept digesting for an additional two hours once it becomes clear and transparent.
After the digestive solution has cooled in an ice bath, an excess of alkali solution is added. At this point, the mixture separates into two distinct layers. It's crucial to handle this step carefully before distillation to avoid mixing the layers prematurely, which could cause ammonia (NH₃) to escape early and result in lower readings. When performing distillation, make sure to heat the system immediately after connecting the distillation unit to prevent the boric acid in the condensation tube from absorbing ammonia due to cooling. The condensation tube plays a key role in capturing NH₃, so it's important to control the heating rate as the solution approaches boiling. Slowing down the heat ensures a smooth boil and prevents excessive release of ammonia, which could lead to incomplete absorption by the boric acid and ultimately inaccurate test results.
Sodium sulfide (Naâ‚‚S) is added during the process to precipitate mercury (Hg), a highly toxic substance. Therefore, after the experiment is completed, the waste liquid must not be disposed of down the drain. Instead, it should be properly collected and treated according to local hazardous waste regulations to minimize environmental and health risks.
For more information on coal tar or related testing equipment, please visit our website or contact Mr. Shen directly via mobile phone. If you need further assistance with calorimeter pricing or technical support, feel free to reach out for a detailed consultation.
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