What are the expected RSD values for geochemical analysis of a Standard as well as for samples under study?
Are 1 to 3 values acceptable or values more than 7 are even acceptable?
The question is with respect to trace elements and the REE in igneous rock samples.
The RSD is a good measure for the precision of the method of analysis. The value depends on the concentration of the analyte. For those analytes with high concentrations the RSD must not exceed 1%. For the PPM concentrations the RSD must not exceed 4-6%. Sometimes up to 12% may be accepted for less concentrations.
Relative standard deviation (RSD) for any analysis in ppm level or higher level should not exceed
Relative standard deviation (RSD) is a measure of precision in data analysis. It is expressed in percent and is obtained by multiplying the standard deviation by 100 and dividing this product by the average.
If an element is above the lower detection limit, then %RSD between 0 and 3% is excellent, between 3 and 7% is very good to good, 7–10% RSD is good, and >10% is not precise.
Read the article (link), this is useful - A Review of Quality Assurance and Quality Control (QA/QC) Procedures for Lithogeochemical Data. Graphical presentation of precision and accuracy (easily understandable - the meaning of accuracy and precision).
https://journals.lib.unb.ca/index.php/GC/article/viewFile/20475/24873
Best wishes
Thank you Asit Kumar Batabyal and all for your excellent informations
For major element 1-5% RSD is acceptable and for trace element (including REEs) upto 10% is acceptable, however, depends on the element the RSD value is vary.
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