The trace elements analyses are done on pressed powder pellets made from 6.5 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.
Elements and Detection Limits (ppm)
Note: Assays are recommended for values which exceed the upper limits.