Planning and execution of geochemical surveys

geochemistryWhen planning a soil survey one has to decide what material is to be sampled and the analytical method that is to be used. After that the survey must be conducted in right way. It is really important that samples are collected correctly. Finally the right interpretation of results and you get most possible out of the survey. We help you in all steps.


Traditional Method

Traditionally samples has been collected from the C-horizon and analyzed with near total leach methods (HCl, Aqua Regia or HF-HNO3-HO). The C-horizon is to represent fresh un-leached glacial till material. It is however very hard to be sure that same kind of glacial sediments are sampled throughout the survey. It will be difficult to trace back the anomalies to the source if there is lack of control on the material sampled.


Selective/Partial leaches

There have been a number of different techniques developed to identify exogenic signals in the sampled material. These signals are representing ions or elements that have been introduced to the material after deposited. The “labile components” are in very low concentration and leached by weak acids. The horizon that is sampled should be a good trap for the labile components, for example the Ah horizon (just beneath the organic layer)

To conduct a successful geochemical-sampling survey you must control following:

  • Motivated and experienced samplers, it is during the very moment of sampling that the quality of the complete survey is set.
  • Control on sampled material
  • Choosing the best analytical method
  • Interpretation of results

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