Analytical Procedure
Samples are analyzed directly
in powder form. This direct form of analysis minimizes sampling error
because of the large sample size; optimizes analytical reproducibility
because samples are not weighed and mixed with any other material; and
keeps detection limits low because the samples are not diluted.
Matrix effects are handled
efficiently by a fundamental parameters-based data reduction method
developed by Kurt Johansson and colleagues in Sweden.
The standard XRF analytical
procedure includes the quantitative analysis of 31 elements (see periodic
table).
Additional elements are routinely analyzed. Special arrangements may be
made to analyze other elements (Z>10).
Quality Control
One replicate sample is
analyzed for every twenty samples. A minimum of
one replicate is analyzed for each group of samples
submitted. At least one certified reference material is analyzed
as an “unknown” with each group of
samples submitted.
Analytical Report
The analytical report includes
a cover letter describing the analytical procedure and a table of
analytical results. The quality control results are included in the
table. All reports are mailed. Reports can be emailed at no extra
charge.
