鉄(III)と水素化ホウ素ナトリウムを用いた総水銀の原子吸光定量法

概要

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Organic mercury compounds such as methylmercury(II) chloride (MMC) and phenylmercury(II) acetate (PMA) were decomposed and reduced by a combined Fe(II)-or Fe(III)-NaBH_4 reagent. A new method utilizing this phenomenon for the determination of mercury in solution by a cold vapor atomic absorption technique is described. A closed type cell (light path length: 10cm) equipped with a reaction vessel was used for a device. The procedure is as follows. 150ml of sample solution containing (0.15〜1.05)μg as mercury was taken into a reaction vessel. After the vessel was connected with the closed type cell, 1.5ml of Fe(II) or Fe(III) (1.00×10^3ppm) and 1ml of NaBH_4 {1% (w/v)} solutions were added to the vessel through an upward inlet of the cell, and then the inlet was closed immediately with a stopcock Then the absorbance due to vaporized mercury atoms was measured until the highest absorption peak was obtained. The addition of Fe(III) was more effective for the determination of organic mercury than that of Fe(II). The linear standard curves for MMG and PMA (as well as HgCl_2) were obtained by the method using a combined Fe(III)-NaBH_4 reagent. The detection limit (S/N=2) for mercury was down to 0.1ng/ml. The application of this method is expected for the determination of total mercury and for the selective determination of inorganic and organic mercury in natural water samples.
社団法人日本分析化学会の論文
1978-10-05