Determination of trace metal impurities in nickel and iron salts using 2-(5-Nitro-2-pyridylazo)-5-(N-propyl-N-sulfopropyl-amino) phenol by capillary zone electrophoresis.

KAGAWA Takuji, TAKAYANAGI Toshio, OSHIMA Mitsuko, MOTOMIZU Shoji

doi:10.2116/bunsekikagaku.51.791

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２‐（５‐ニトロ‐２‐ピリジルアゾ）‐５‐（Ｎ‐プロピル‐Ｎ‐スルホプロピルアミノ）フェノールを用いるキャピラリー電気泳動法によるニッケル，鉄塩中の極微量不純物の定量
2-(5-ニトロ-2-ピリジルアゾ)-5-(N-プロピル-N-スルホプロピルアミノ)フェノールを用いるキャピラリー電気泳動法によるニッケル,鉄塩中の極微量不純物の定量
2 5 ニトロ 2 ピリジルアゾ 5 N プロピル N スルホプロピルアミノフェノールオモチイルキャピラリーデンキエイドウホウニヨルニッケルテツエンチュウノゴクビリョウフジュンブツノテイリョウ

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2-(5-Nitro-2-pyridylazo)-5-(N-propyl-N-sulfopropylamino)phenol (Nitro-PAPS) was used for a quantitative determination of ultratrace-level metal ions in commercially available metal salts by capillary zone electrophoresis. At pH 7, Nitro-PAPS reacts with various metal ions to form chelate compounds having large molar absorptivities. Although chelate formation is useful for the highly sensitive detection of metal ions, the resolution of the metal complexes is poor at pH 7. Cetyltrimethylammonium bromide was added to suppress any electroosmotic flow. The hydration of nitro groups of a chelating agent and chelates was controlled by the addition of urea. Sodium sulfate was also utilized to sharpen the signals of metal chelates by a field-enhanced stacking effect. As a result, the resolution was improved and the determination of 10^-7 M level metal ions was possible. The proposed method was applied to the analysis of metal impurity at ultratrace levels in commercially available nickel and iron salts.

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BUNSEKI KAGAKU

BUNSEKI KAGAKU 51 (9), 791-795, 2002

The Japan Society for Analytical Chemistry

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