4. Conclusions
Two nanosubstrates were used and compared for Sb(III)
preconcentration. The on-line combination of NPC or pro-MWCNTs in
a SPE-FI-HG-AAS system resulted fully able to determine Sb at ng L−1
levels. Themixture of each substratewith a lowmolecular weight polyethylene
wax (with no need for substrate immobilisation) avoided agglomerations
and overpressures in the on-line system. NPC and pro