4C1 - Pressed Pellet - XRF
The trace elements analyses are done on pressed powder pellets made from 6 g of sample. Spectral interferences are corrected from pre-calculated interfering factors. Because of the trace level (< 1000 ppm) of the analytes, only the mass absorptions are corrected for matrix effects. The mass absorption coefficients are derived from measuring the
Compton
scatter of the Rh-tube (e.g., Nisbet et al., 1979. Fortschr. Miner., volume 57, pp. 264-279). The background and mass absorption corrected intensities are then calculated against the calibrations constructed from 24 international geological reference materials. In general, the limits of detection are between 1 to 5 ppm. Samples are measured on a Panalytical Axios Advanced using the Protrace program.
Code 4C1
Elements and Detection Limits (ppm)
|
Element
|
Detection Limit
|
Upper Limit
|
|
Element
|
Detection Limit
|
Upper Limit
|
|
Element
|
Detection Limit
|
Upper Limit
|
|
Ba
|
5
|
10,000
|
|
Nb
|
1
|
10,000
|
|
V
|
5
|
10,000
|
|
Co
|
5
|
1,000
|
|
Ni
|
4
|
4,000
|
|
Y
|
2
|
10,000
|
|
Cr
|
5
|
10,000
|
|
Pb
|
5
|
1,000
|
|
Zn
|
5
|
1,000
|
|
Cu
|
5
|
2,500
|
|
Rb
|
2
|
10,000
|
|
Zr
|
5
|
10,000
|
|
Ga
|
5
|
10,000
|
|
Sr
|
2
|
10,000
|
|
|
|
|
Note: Assays are recommended for values which exceed the upper
limits.
|