摘要
通过3种途径的实验,定性、定量地对氢化物—原子荧光光谱分析中镍对砷测定的干扰机理进行了探讨。得出如下结论:过渡金属元素镍对砷测定的干扰主要发生在液相中,镍对砷测定的干扰是吸附、催化分解和结合机制共同作用的结果,当干扰物的浓度一走而砷的浓度不同时,起主要作用的干扰因素有所不同。通过用KBH_4还原所产生的黑色沉淀的物相分析,进一步证明了上述结论的正确性。
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.
关键词
镍
砷
氢化物
原子荧光光谱
干扰
Hydride generation-atomic fluorescence spectrometry Interference mechanism Nickel Arsenic
