摘要
本文提出了用流动注射喷射式氢化法直接测定Pb的方法,并对测定条件及共存元素的允许存在量进行了研究,还就K_3Fe(CN)_6对Pb的增敏作用机制进行了探讨并提出了以下反应模式:①K_3Fe(CN)_6首先将Pb~Ⅱ在碱性条件下氧化至Pb~Ⅳ:②K_3Fe(CN)_6再与Pb~Ⅳ发生化学反应:③上述的生成物在用NaBH_4还原时可大大提高Pb的转化率。
In this paper, we have studied the mechanism of enhancement sensitivity effect of oxidants, such as H_2O_2, K_2Cr_2O_7, (NH_4)_2S_2O_8 and K_3Fe(CN)_6 on Lead, while determination is carried out with FIA-GH-AAS.
These experimental results indicated that, the sensitivity from K_3Fe(CN)_6 is higher than the sensitivity from other oxidants.
This process is considered as below: Pb^(2+) is oxidized by K_3Fe(CN)_6 at first, and then K_3Fe(CN)_6 reacts upon higher oxidized Lead cation. This product raised the yield of PbH_4, during the period of the hydride-generation. Therefore the sensitivity is markedly incresed.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
1992年第3期75-82,共8页
Spectroscopy and Spectral Analysis
关键词
增敏
FIA
氢化物AAS
铅
FIA, GH-AAS, Mechanism of enhancement sensitivity, Detemaination of Pb
