キレート樹脂の直接原子化による鉛の原子吸光光度定量

概要

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A sensitive method for the determination of ultra-micro amounts of lead by electrothermal atomic absorption spectrometry was attemped. The method is based on the direct atomization of lead-adsorbed resin, that is, the resin is introduced directly as a "resin-suspention" into a carbon tube atomizer. To a 250ml sample solution (pH : 4) containing less than 0.40 *g of lead, 0.10 g of chelating resin (NH_4 + -form, below 400 mesh) is added, and mixture is stirred for 10 min. After separation of the resin from the aqueous phase through a membrane filter, 5.0 ml of resin-suspension is prepared by adding water to the resin. Then, 10 *l (resin: 0.2 mg) of the suspension is injected into an atomizer. Lead-adsorbed resin is initially dried at ca. 300 ℃ for 20 s, subsequently heated at ca. 900 ℃ for 90 s in the atmosphere, and lead on the resin is atomized at ca. 2100 ℃ for 10 s in argon atmosphere (argon flow rate: 21/min). The calibration graph was linear up to 1.6 ppb of lead, and the relative standard deviation was 3.7% at 0.8 ppb level of lead.
社団法人日本分析化学会の論文
1982-07-05