ニッケル-ジメチルグリオキシム錯体共沈捕集/加熱気化原子吸光法による水中の微量水銀の直接定量(<特集>超微量分析のための前処理と予備濃縮)

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  • Preconcentration of trace amounts of mercury in water samples by coprecipitation with nickel-dimethylglyoximate and direct determination by AAS.
  • ニッケル‐ジメチルグリオキシム錯体共沈捕集／加熱気化原子吸光法による水中の微量水銀の直接定量
  • ニッケル ジメチルグリオキシム サクタイ キョウチン ホシュウ カネツ キカ

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A high sensitive, accurate, and simple method for the determination of ultra-trace amounts of Hg(II) in natural waters was established by AAS with the amalgamation on gold after a coprecipitation with chelating reagents. Ni(II) and dimethylglyoxime(DMG) were used as a carrier ion and complexing agent, respectively. Conditions for coprecipitating Hg(II) with Ni-DMG were examined, and 2-merucaptobenzotiazol(MBT) as an auxiliary chelating agent was added for facilitating the coprecipitation of Hg(II). The recovery of Hg (II) was improved by the addition of 5 mg of MBT from 35% to 100%. Based on these examinations, a recomendable analytical procedure has been established. A sample solution(50300 ml) was taken in a borosilicate glass beaker, and then 5 mg of Ni(II) was added as carrier ion. After addition of 35 mg of DMG and 5 mg of MBT, pH was adjusted with conc. ammonia water to 9. After standing 60 min at 60°C, the precipitate was collected by a fine glass frit filter (pore size 510 μm) and drying in oven for 60 min at 110°C. Enrichment factor of this method reached to 12000 when 300 ml of sample solution was used and the weight of coprecipitate obtained was 25 mg. Analytical blank was 0.20 ± 0.03 ng. Detection limit was 0.3 ppt. Relative standard deviation (ca. 2.14.8%) was shown for each measurement. This method was applied for the determination of Hg(II) in seawater and sewagesludge.

収録刊行物

  • 分析化学

    分析化学 36 (11), 750-754, 1987

    公益社団法人 日本分析化学会

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