| 流动注射-氢化物发生-原子吸收光谱分析中氧化剂对铅增敏作用的研究 |
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| 引用本文： | 魏继中,林帆,王新省. 流动注射-氢化物发生-原子吸收光谱分析中氧化剂对铅增敏作用的研究[J]. 光谱学与光谱分析, 1992, 0(3) |
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| 作者姓名： | 魏继中 林帆 王新省 |
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| 作者单位： | 南开大学化学系，南开大学化学系，南开大学化学系 300071 天津，300071 天津，300071 天津 |
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| 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。
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| 关 键 词： | 流动注射分析 氢化法AAS 增敏作用机制 Pb的测定 |
INVESTIGATION OF THE ENHANCEMENT SENSITIVITY EFFECT OF SOME OXIDANTS ON LEAD IN FLOW-INJECTION HYDRIDE GENERATION-AAS |
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| WEI Jizhong LIN Fan WANG Xinshen. INVESTIGATION OF THE ENHANCEMENT SENSITIVITY EFFECT OF SOME OXIDANTS ON LEAD IN FLOW-INJECTION HYDRIDE GENERATION-AAS[J]. Spectroscopy and Spectral Analysis, 1992, 0(3) |
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| Authors: | WEI Jizhong LIN Fan WANG Xinshen |
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| Affiliation: | WEI Jizhong LIN Fan WANG Xinshen Department of Chemistry,Nankai University,300071 Tainjin |
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| Abstract: | 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. |
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| Keywords: | FIA GH-AAS Mechanism of enhancement sensitivity Detemaination of Pb |
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