-Possible sources of errors can be checked - Relatively inexpensive - Cheap, easily available apparatus, simple to carry out - Wide range of sample concentrations (ng - kg) - No calibration required (except for the balance)
-Possible sources of errors can be checked- Relatively inexpensive- Cheap, easily available apparatus, simple to carry out- Wide range of sample concentrations (ng - kg)- No calibration required (except for the balance)