| The mechanism of nickel interference with arsenic determination by hydride generation-atomic fluorescence spectrometry was qualitatively and quantitatively investigated in three ways. It was concluded that the interference of nickel, a transition metal element, with arsenic determination occurred mainly in liquid phase, resulting from the joint effect of catalytic decomposition, absorption and combination mechanism, and the main factor of nickel effect on arsenic determination was different with the difference in arsenic concentration. The interference mechanism was further confirmed by the phase analysis of the black precipitate formed in the reduction of nickel by KBH4. |