Hai,
Please help!!
I am doing a study on REE in some rivers.
To find the relative enrichment of LREE or HREE how should I do.
I did the normal calculation of Sum of LREE/sum of HREE and if the value is greater than 1 it LREE enrichment and Less than 1 HREE. However, I did this simple calculation in the Obtained concentration of data from ICP-MS and I am getting a High LREE enrichment.
The problem I am facing is this is not the case for a normalized pattern where if I do the above calculation it shows HREE enrichment and also the spider plot show the same. I also did some other ratio calculations with normalized data all showing HREE enrichment.
Which should I follow? the normalized data or non-normalized data to find the REE Enrichment of my water samples.
It would also be a kind gesture if anyone can provide me with the equation to calculate the REE enrichment for example for (La/Lu)PAAS.
thank you for your kind consideration
Perhaps you could look in the topic section: 150 questions with answers in RARE EARTH ELEMENTS | Science topic (researchgate.net)https://www.researchgate.net/topic/Rare-Earth-Elements
What you're looking for are normalised values. Naturally occurring LREE are almost always more abundant than HREE simply because of their greater average abundance in the crust.
What you want is to see whether the LREE are enriched even more than the usual overabundance over the HREE. You do this, as you said, by normalisation.
You can get good PAAS numbers for normalisation here:
Article A novel extraction chromatography and MC-ICP-MS technique fo...
Note that they use ppm (μg/g), so your units needs to be the same, in case you have them reported as mol/mL or something similar.
Because you're looking at water samples, you might have tetrad effects and Ce/Eu anomalies so you might want to look at the method described here:
Article Quantifying the Tetrad Effect, Shape Components, and Ce–Eu–G...
And the associated app:
https://lambdar.rses.anu.edu.au/blambdar/
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