Abstract
Nuclear microprobe by coupling the resonant nuclear reaction 12 C( p, p) 12 C and proton-induced X-ray emission (PIXE) at 1.725 MeV has showed its capabilities to study a ternary system silica slide/humic acids (HA)/iodine. The nuclear reaction on carbon-12 permits the determination of thickness (from 8 nm to 2.5 μm ) of HA films sorbed on mineral surfaces, whereas PIXE simultaneously allows the quantification of trace elements scavenged by HA. The results obtained on the ternary system have evidenced a heterogeneous distribution of HA onto silica slides (presence of organic clusters of variable thickness) and confirmed the trace elements/organic matter association. Moreover, the data suggest a role played by HA in the retention of iodine onto silica slide surfaces.
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