Highly sensitive determination of copper ion with newly synthesized water-soluble fluorescent reagents having a 1,8-diaminonaphthalene-3,6-disulfonic acid skeleton.

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  • １，８‐ジアミノナフタレン‐３，６‐ジスルホン酸骨格を持つ新規水溶性蛍光試薬の合成と銅イオンの高感度定量への応用
  • 1,8-ジアミノナフタレン-3,6-ジスルホン酸骨格を持つ新規水溶性蛍光試薬の合成と銅イオンの高感度定量への応用
  • 1 8 ジアミノナフタレン 3 6 ジスルホンサン コッカク オ モツ シンキ スイヨウセイ ケイコウ シヤク ノ ゴウセイ ト ドウ イオン ノ コウカンド テイリョウ エ ノ オウヨウ

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Abstract

Water-soluble fluorescent reagents, 1,8-di-(toluene-4-sulfonylamino)-naphthalene-3,6-disulfonic acid (BTND) and 1,8-di-(trifluoromethanesulfonylamino)-naphthalene-3,6-disulfonic acid (BTFND), were newly synthesized. The reactivities of these fluorescent reagents to Cu2+, Ni2+, Co2+, Cd2+, Pb2+, VV, Ag+, Fe3+, and Mg2+ were examined. BTFND was reacted with 8 metal ions, except for Pb2+, to show fluorescence quenching. BTND was selective to Cu2+, and the fluorescence was quenched quantitatively at pH 7 in an aqueous solution (λex=360 nm and λem=405 nm). The calibration graph for Cu2+ with BTND was rectilinear over the concentration range from 0 to 10-5 M and the detection limit was 2.0×10-7 M. BTND has many advantages, such as selectivity for Cu2+, high sensitivity, and a simple procedure.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 51 (9), 785-789, 2002

    The Japan Society for Analytical Chemistry

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