1. The use environment of the microwave digestion instrument.
Microwave digesters do not necessarily need to be used in a fume hood and are usually equipped with an exhaust system.
Second, the choice of acid.
In microwave digestion, the following should be noted when using sulfuric acid and perchloric acid:
Perchloric acid can be used, but it needs to be broken down with nitric acid first.
Sulfuric acid may cause disturbances after digestion, usually with nitric or hydrochloric acid.
In some cases, the acid needs to be volatilized, and sulfuric acid contains perchloric acid and cannot be volatized.
Sulfuric acid has a high boiling point and is usually present in a liquid state when digested, which can lead to local overheating. Therefore, gas-liquid mixing is more recommended in microwave digestion.
3. Control the amount of weighing.
For unknown samples, it is recommended to start from 01 gram starts;For organic samples with high oil content, consider weighing 02 g to 0About 3 grams. Gradually increase the temperature before heating, such as 50°C, 80°C, 100°C, to reduce the risk of tank explosion.
Fourth, the size of the jar selection.
A 50 ml or 100 ml digestion jar is usually used.
5. Digest multiple samples at the same time.
Try to avoid experiments with less than 4 samples, if the number of samples is less than one, use solvent to fill the vacancies, but do not use pure water, the digestion conditions may be different for different samples.