What should I know about the storage of soil samples for analysis and speciation of heavy metals physicochemical?
And how long you can almacenarce?
The answer depends on the metal but a good start for many is freezing at minus 20 degrees
I think for heavy metals analysis you should store your collected soil samples in air and moisture proof plastic bags or in clean polyethylene bottles in a refrigerator.
book :
Trace Element Speciation Analytical Methods and Problems
Par Graeme E. Batley
At any wetting and drying cycle, amorphous iron oxides get recrystallized to some extent, which means a decrease in the respective mobility. Aeration oxidizes the Fe-hydroxides and promotes bacterial sulfur oxidation. Best speciation is therefore obtained from the samples of natural humidity, and the water content determined in an aliquot. In our routine, however, the samples are dried at 35 °C in a special room, to make them stable and to prevent biological transformations. Mercury remains, but this has not been proved for methyl-Mercury yet, to my knowledge. H2Se might be lost from reducing substrates.
I may suggest to extract the soil within a week or so then it must be freezed below 0C preferably at about 15 - 20 0C. Even then extract should as soon as possible because storage for long tomes would alter the results, i.e. and error will be possibly that may take the researcher away from reality.
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