PTFE crucibles are suitable for digesting samples with strong acids or alkalis. For example, in the analysis of metal elements in environmental samples, PTFE crucibles can be used to digest soil or water samples with a mixture of nitric acid and hydrofluoric acid to convert the metal elements in the samples into soluble forms for subsequent analysis.
In the determination of the ash content of organic samples, PTFE crucibles can be used to heat and ash the samples at high temperatures. The high temperature resistance and chemical stability of PTFE crucibles ensure that the crucibles will not be corroded during the ashing process, and the ash content of the samples can be accurately measured.