The oil sample should be carbonized at a low temperature for a certain period of time during the digestion process, and then the temperature is increased for boiling digestion. If the temperature is too high, the sample will spill and affect the result. To ensure sufficient digestion time to fully digest the sample, the digestive juice should be digested for 2 hours after it is transparent.
After the digestive solution is cooled in an ice bath, an excess of alkali solution is added. At this time, the acid-base solution is divided into two layers, and the operation is carefully performed before the distillation to prevent the two layers of the solution from being mixed out to release NH3 in advance, resulting in a low result. When distilling, after the distillation unit is connected, it should be heated immediately to prevent the absorption of boric acid in the condensation tube due to the cooling of the digestive solution. The absorption of NH3 should be affected by the condensation tube. When heating to near boiling, the heating rate should be slowed down to make the solution boil smoothly and prevent NH3. Too fast to escape, boric acid can not be absorbed and the test results are low.
The purpose of adding Nazs is to precipitate Hg, which is a toxic substance. Therefore, after the end of the experiment, the waste liquid cannot be poured into the sewer, but should be collected and treated.
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