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FAQ
Q1.What are the most important factors affecting sample digestion?
Answer: 1. Temperature control accuracy; 2. Temperature difference between holes; 3. Temperature rise curve; 4. Sampling amount and reagent addition amount. The first two of the above four factors are determined by the performance of the instrument itself, and the last two are the supporting experimental solutions of the instrument. The above four aspects all meet the experimental requirements and can better ensure the accuracy and parallelism of the experimental results.
Q2.How to deal with the harmful gases produced in the process of digestion in the experiment?
Answer: The harmful gas produced in the process of digestion is mainly sulfur dioxide, which has strong irritation and corrosiveness. Placing it in the fume hood will cause corrosion to the fume hood and cause great harm to the laboratory environment. At present, there are two solutions: 1. Configure a simple waste discharge device to discharge the waste gas and tap water into the sewer by using the negative pressure suction of tap water; 2. Use a waste gas absorption system to effectively treat the waste gas generated by multi-stage absorption.
Q3. How to use the waste discharge device when the amount of digestion sample is less than number of holes of the digestion instrument?
Answer: When the amount of digestion sample is less than that of the digestion instrument, if it is not treated, it will cause the leakage of acid mist and affect the efficiency of waste discharge. It is suggested that the empty space should be separately equipped with a sealed digestion tube, or a digestion tube with dry salt or concentrated sulfuric acid should be placed in the empty space to achieve the best waste discharge and digestion.
Q4. Must the digester be used in a fume hood?
Answer: Yes, because a large number of toxic and harmful gases with irritation will be produced during the digestion experiment. It is very harmful to the safety of laboratory personnel and the laboratory environment, and the state stipulates that similar digestion experiments must be carried out in a fume hood. At the same time, in order to reduce the overflow of acid mist, it is recommended to configure waste discharge device and waste gas neutralization system to ensure the safety of laboratory personnel and environment.
Q5. How long does it take to digest a batch of samples?
Answer: According to the experimental standard, the conventional digestion of nitrogen-containing samples is based on the color change of the sample. When the sample is transparent blue-green, the digestion time is 30-60 minutes. Generally, the digestion time is 2-3 hours. Some samples of soil and fertilizer need to be added with reducing agent, and the color of digestion solution is different from that of conventional samples. Generally, it can be digested for 1-1.5 H at standard temperature.
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