The behaviour of boron in the alluvium-water system was studied in samples collected from the Cecina river (Tuscany). The following conclusions can be drawn: (1) The high boron content in surface waters yields an enrichment of boron in stream sediments; after separation of clay minerals, the boron enrichment was identified in this fraction. (2) The boron adsorbed by clay minerals averages 20% in the samples related to boron rich surface waters. (3) The boron adsorbed by the clay minerals in "normal" conditions is about 10%. Therefore the stream sediments seem to play an important role as solid phase in boron distribution during the epigenetic processes.
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Con il contributo del Ministero per i Beni e le Attività Culturali