Speciation of As in environmental samples using the nano-TiO/PCHG-FAAS online system.

This work presents an alternative method for arsenic speciation using the nano-TiO hydride generation photocatalytic hydride generation (PCHG) system, which is easily separated from the medium. Nano-TiO was studied as photocatalyst to reduction of arsenic species by UV-induced with formic acid and atomic absorption detection of different forms of arsenic [As (III), As (V), dimethylarsinic acid (DMA)] in environmental samples (water, sediment and plant). The effect of the average pH, the organic acid concentration, the ultraviolet irradiation time and their amount were investigated.