3-[(2-アルソノフェニル)アゾ]-4,5-ジヒドロキシ-2,7-ナフタレンジスルホン酸 化学特性,用途語,生産方法
解説
2-(1,8-dihydroxy-3,6-disulfo-2-naphthylazo)phenylarsonic acid disodium salt．C16H11AsN2Na2O11S2(592.29)．ネオトリンともいう．o-アミノアルソン酸をジアゾ化し，クロモトロープ酸にアゾカップリングさせると得られる．
"深赤色の粉末．pK1 0.1，pK2 1.2，pK3 2.7，pK4 7.9，pK5 10.5．多くの金属と赤～青紫色の水溶液キレート錯体をつくるので，三ナトリウム塩はキレート滴定の指示薬，比色試薬に用いられる．トリウム(Ⅳ)，ウラン(Ⅵ)，ニオブ(Ⅴ)，タンタル(Ⅴ)，希土類，そのほかの金属イオンの比色定量に用いる．[CAS 520-10-5][CAS 3547-38-4:三ナトリウム塩]
森北出版「化学辞典（第2版）
化学的特性
bordeaux powder
使用
The reagent reacts with many metal ions, such as uranium(IV), thorium(IV),
zirconium(IV), scandium(III), lanthanum(III), cerium(III), aluminium(III), beryllium(
III), titanium(III), niobium(lll), tantalum(III), vanadium(IV), tin(IV), bismuth(
III), gallium(III), copper(III), palladium(II), magnesium(II) and calcium(II)
to give coloured complexes. It has been used for the photometric determination
of the majority of the above-listed metal ions. Though the reagent reacts
with such a variety of metal ions, the complex formation reaction may be made
selective for individual metal ions by appropriate choice of the reaction conditions,
primarily of the pH of the solution. For instance, thorium can be determined
with Arsenazo I in the presence of almost all rare earth metals, and
similarly zirconium and thorium in the presence of uranium, etc.
The stabilities of the metal complexes of Arsenazo I are lower than those of the
corresponding complexes of EDTA. It can also therefore be used advantageously
as indicator in complexometric determination of some metals (e.g. plutonium,
thorium).
The analytical sensitivity of the formation of Arsenazo I complexes is comparatively
high (0.05-0.1 γ/ml). However, the importance of the reagent is decreasing
in analytical practice, in parallel with an increase in significance of the
related reagent, Arsenazo III, which gives more stable complexes with higher
absorbances, and which is therefore of greater analytical sensitivity.
3-[(2-アルソノフェニル)アゾ]-4,5-ジヒドロキシ-2,7-ナフタレンジスルホン酸 上流と下流の製品情報
原材料
準備製品