リン酸イットリウム共沈分離 : 電気加熱原子吸光分析による鉄鋼中の微量鉛の定量(<特集>分析技術と方法論の最近の進歩)

概要

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The coprecipitation technique using yttrium phosphate as a coprecipitant has been applied to separation of lead from iron matrix. Lead ranging from 0.035 to 1.0μg could be coprecipitated quantitatively with yttrium phosphate at pH 3.0 from 100mL of approximately 1mol/L nitric acid solution containing up to 500mg of iron and 3.0g of ascorbic acid as a reducing agent; the recovery of iron could be suppressed at less than 0.1%. The collected lead could be determined by electrothermal atomic absorption spectrometry without any interference of yttrium and phosphate after dissolution of the precipitate. In the proposed method, the limits of detection (3σ) and quantification (10σ), which were calculated based on the values obtained from the eight replicate determinations of the blank, were 0.010μg and 0.035μg, respectively. The proposed method was applicable to the determination of lead in certified reference material (JSS 591-1) and commercially available iron powder.
社団法人日本鉄鋼協会の論文
2007-02-01