What are the advantages and disadvantages of high temperature electric furnace ashing method in the treatment of samples

The advantages and disadvantages of the high temperature electric furnace ashing method are that the operation of the high temperature ashing method is simple, and it is suitable for the treatment and determination of a large number of samples, and it can avoid the pollution of the samples without adding other unnecessary reagents. The disadvantage of this method is that it is easy to cause volatilization in the ashing process, which causes the sample to suffer different degrees of loss, the sample with the elements to be tested adhering to the wall or remaining on the acid soluble ash particles, selenium and mercury volatile elements. If the volatilization loss is serious in the treatment, this method is not recommended to treat the sample.

According to the sample situation, the low temperature in the re discharge furnace must be about 370 ~ 590 ℃ so that the sample can be completely ashed. The furnace temperature and operation time of different ashing samples are different. After cooling, the ash is washed out with inorganic acid and diluted with deionized water, and then determined by atomic absorption spectrometry.

High temperature box furnace ashing process is to use thermal energy to decompose its organic samples. In order to make the elements to be measured into soluble state and accurately weigh 0.5-1.0g, the pretreated samples must be used, except for the samples that must be pretreated. Generally, the crucible is porcelain crucible, some platinum crucible or quartz crucible are placed in the box furnace for low-temperature carbonization until it comes out The smoke is nearly exhausted.