I would like to use the 3D Trace Elements DRS, as it seems to outperform the older Longerich et al. (1996)-based trace elements DRS, but I'm having trouble understanding how the new data reduction scheme works. Maybe this is a good venue to ask this question.
In Paul et al. (2023), which describes the 3D trace elements approach, the first step of calculations seems to be creating a calibration curve for each standard block, concentration against intensity, and then extrapolating the calibration curves between the blocks to cover the sample data. The paper also seems to describe the older Longerich-based calculation method as a "single point calibration curve". As you all know well, laser ICPMS data doesn't work well with calibration curves because of drift, changes in laser settings between spots, matrix effects between phases, etc. The Longerich-approach sidesteps calibration curves by using internal standardization, so it is confusing to me that it is described as a "single point calibration curve", and thus very confusing to me that the 3D trace elements data reduction scheme is described as a multi-reference material calibration curve that is extrapolated through time. How does it actually work? How does internal standardization work with this approach?
Is there somewhere where the calculation procedure is explicitly written out? Thanks for your help!