Enhancement of the atomic absorbance of Cr, Zn, Cd, and Pb in metal furnace atomic absorption spectrometry using absorption tubes

Yuya Koike , Kenta Hagiwara , Toshihiro Nakamura
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引用次数: 8

Abstract

Trace amounts of Cr, Zn, Cd, and Pb were determined by metal furnace atomic absorption spectrometry using absorption tubes. Various absorption tubes were designed as roof- and tube-types, and fixed above the metal furnace in order to extend the light path length. Aqueous standards and samples were injected in the metal furnace and atomized in a metal atomizer with an absorption tube (6 cm length, 15.5 mm diameter). The used of an absorption tube resulted in an enhancement of the atomic absorbance. The ratios of absorbance values with and without the roof- and tube-type absorption tubes were 1.33 and 1.11 for Cr; 1.42 and 1.99 for Zn; 1.66 and 1.98 for Cd; and 1.31 and 1.16 for Pb, respectively. The use of an absorption tube was effective for Zn and Cd analysis, as the absorbance values for these low boiling point metals doubled. The proposed method was successfully applied in the determination of Zn in tap water.

Abstract Image

利用吸收管增强金属炉原子吸收光谱法中Cr、Zn、Cd和Pb的原子吸收
采用吸收管金属炉原子吸收光谱法测定痕量铬、锌、镉和铅。各种吸收管被设计为屋顶型和管型,并固定在金属炉的上方,以延长光路长度。在金属炉中注入水样和标准品,在金属雾化器中雾化,雾化管长6 cm,直径15.5 mm。吸收管的使用增强了原子的吸光度。Cr的吸光度与不加顶板吸收管和管状吸收管的比值分别为1.33和1.11;Zn为1.42和1.99;Cd为1.66和1.98;Pb分别为1.31和1.16。吸收管的使用对Zn和Cd的分析是有效的,因为这些低沸点金属的吸光度值增加了一倍。该方法成功地应用于自来水中锌的测定。
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