Only in few cases, elements can be directly measured out of pure sample. To enable a quantitative determination in solids, e.g. by spectroscopic technologies, a sample preparation step (e.g. acid digestion) is necessary.
As a rule, acid digestion procedures are employed for the determination of elements in solids subsequent to sampling and mechanical sample preparation in order to completely transfer the analytes into solution so that they can be introduced into the determination step (e.g., ICP-OES, ICP-MS, AAS) in liquid form. The goal of every digestion process is therefore the complete solution of the analytes and the complete decomposition of the solid (matrix) while avoiding loss or contamination of the analyte.
- Complete solution of the elements;
- Complete decomposition of the matrix;
- Avoiding losses and contamination;
- Reduction of handling and process times
THERMO Scientific have prepared a handbook that contains examples of typical sample preparation methods recommended for AAS, ICP-OES and ICP-MS analysis of a variety of sample types.
Disclaimer: The described sample preparation protocols require the use of hazardous chemicals.
Appropriate personal protective equipment as recommended by local safety requirements should be used. A full risk assessment should be carried out prior to undertaking any activities.