黒鉛炉原子吸光法によるロジウム-マグネシウム混合修飾剤存在下でのセレンの検出感度及び精度向上メカニズム

概要

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A new mixed chemical modifier, rhodium nitrate-magnesium nitrate (RhNO_3-MgNO_3), has been applied to the determination of trace amounts of selenium in human hair samples by using graphite furnace AAS. The use of combined modifier allows a compromise of higher pyrolysis temperature in the detection of selenium. The ashing and atomization temperatures for selenium are 1000℃ and 2600℃, respectively. A study of the mechanism found that this mixed modifier combined with selenium to form a new material, a Rh-Mg-Se alloy, on the surface of the furnace during the ashing stage. The addition of modifier, as a selenium retainer, considerably improved the selenium sensitivity and stability of the method. The selenium level in a certified reference material, "NIESNo. 5 Hair", and a mixed human hair sample were determined by using the method. The obtained analytical result was in good agreement with the certified value. The relative standard deviation (RSD % ) for selenium was within 7%. The detection limit (3σ) of the method was 0.08 ng Se for 10 μl injection sample.
社団法人日本分析化学会の論文
1997-10-05