Certified reference materials for extractable trace metals in soils: effect of the particle size
1998
Sahuquillo, A. | Bosch, H. | Rauret, G. | Muntau, H.
Homogeneity of a soil reference material was tested at two different stages of production: in the bulk material and after bottling. To increase homogeneity in the bottle, the material may be ground thoroughly, but this may change the material and consequently the extractable trace metal content even the stability of the extractable contents over time may change. These effects were studied for Cd, Cr, Cu, Ni, Pb, and Zn using acetic acid and EDTA as extracting solutions. Hard grinding of the soil increased or decreased the extractability of some heavy metals depending on the metal and the extractant, whereas the stability of the material was not affected by this treatment, except for Cd when using EDTA. As the homogeneity achieved in bottle by a short manual shaking was sufficient for the procedure studied, no hard grinding is recommended.
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