Instrument Role
Enclosed laboratory containers facilitate the chemical breakdown of textile samples using heat and concentrated reagents under controlled pressure. A digestion vessel is typically constructed from high grade stainless steel with a chemically inert polytetrafluoroethylene lining to prevent contamination of the sample. It enables the dissolution of organic matter for the analysis of heavy metals or banned substances within the fabric structure and ensures the sample is fully liquid for high precision measurement.
Operational Scope
Microwave radiation or thermal ovens provide the energy required to accelerate the reaction inside the sealed chamber. The digestion vessel maintains a constant volume while the temperature increases, which forces the acid into the fibre matrix more effectively than open beaker methods. Safety vent valves protect the laboratory environment from overpressure events caused by rapid gas evolution during the decomposition of synthetic polymers.
Testing Sequence
Precise weight measurements of the dry specimen must precede the addition of acids like nitric or hydrochloric. Once the digestion vessel has cooled, the resulting liquid is diluted and filtered for introduction into analytical equipment like an atomic absorption spectrometer. Accurate results require the complete conversion of the solid textile into a clear solution without any visible residue or precipitation.
Equipment Maintenance
Routine inspections verify the integrity of the internal seals and the smoothness of the lining surface. A damaged digestion vessel can introduce trace elements into the test result or fail to hold the required pressure for complete fibre dissolution.
