氢化物发生——原子荧光光谱法测定铅的研究(Ⅱ)共存元素干扰的抑制

Atomic fluorescence spectrometric determination of lead by hydride generation technique: (Ⅱ) interfering effect of foreign ions

〔目的〕研究K3 [Fe(CN) 6]-KBH4-HCl体系 ,断续流动氢化物发生—原子荧光光谱法测定铅的共存元素干扰抑制。〔方法〕观察草酸干扰抑制剂对铅烷发生效率的影响及铁氰化钾抑制干扰元素的效果。〔结果〕草酸对铅烷的发生效率有明显的抑制作用 ;铁氰化钾具有一定的抑制共存元素干扰作用。〔结论〕草酸用于铅测定的干扰抑制剂的同时 ,降低分析方法灵敏度 ;铁氰化钾适用于公共卫生样品中铅的测定。

睴bjective〕The interfering effects and suppression of foreign ions on the determination of lead was studied in the K 3〔Fe(CN) 6〕-KBH 4-HCl system by intermittent flow HG-AFS. 〔Methods〕 Influence of oxalic acid on generation of PbH 4 and efficience of K 3〔Fe(CN) 6〕 on the interference of foreign ions were tested. 〔Results〕 It was found that generation of PbH 4 could be visibly suppressed by oxalic acid and the interference of foreign ions could be suppressed in varying degrees in the presence of K 3〔Fe(CN) 6〕. 〔Conclusions〕 The sensitivity of the method could be depressed by using oxalic acid. As an interference masking agent, K 3〔Fe(CN) 6〕 could be used to the determination of lead in hygienic samples.