ミニカラム-キレート樹脂濃縮/黒鉛炉原子吸光法による天然水中のコバルトの定量

概要

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A micro-scale technique for the preconcentration of Co at sub-ppb level in natural water samples has been developed. A 10-ml aliquot of filtered sample and 1ml of pH buffer were added to a mini-column containing 0.25ml of Unicellex A-100 or B-100. The sample solution was adjusted to pH 4.0. Cobalt was adsorbed on the resin by batch operation (15 min) and then column operation was performed. After the resin was rinsed with water and pH 5.2 buffer, Co was stripped from the resin with 0.2ml of 2M hydrochloric acid. The eluate was subjected to Co determination by graphite furnace AAS using a pyrolytic graphite tube. A preconcentration factor of 50 was obtainable using 10ml of water sample. The lower limit of determination (10σ) was 0.050μg/l. Relative standard deviations (n=4), using Unicellex B-100,were 1.0% for 0.97μg/l of Co in river water and 4.5% for 0.22μg/l of Co in seawater.
社団法人日本分析化学会の論文
1991-01-05