This method exists of determining heavy metal contents of soils and sediment in-situ without taking samples to the lab for conventional chemical analysis. I want to ask if the result can be reliable and how accurate can it be compared to the normal method of chemical analysis in the remote lab.
The portable XRF is a good technique for screening and exploratory purposes in field. The reliability depends on several factors (moisture, texture, organic matter content, etc), and also depends on the considered elements. I have obtained good results in the case of As, Pb, Cu, Zn. Otherwise, the equipments available are quite versatile, and specific calibration and corrections according to the soil type can be made to improve the results. For more information, please read the attached article.
I think this will help to get an idea of the chemistry, however it may not be very accurate. This is what I understand.
Yes, its good for screening heavy elements (relative concentrations can be obtained). Accuracy will depend on the calibration procedures, quantification method used, and associated corrections. But, there remains a doubt for in-situ measurements on under-prepared (non-ground) samples because of in-homogeneity (scanning and averaging is better) particle size and mineralogical effects. Some rapid on-field grinding and mixing before measurement may help.
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