ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Cinnamohydroxamic acid, a reagent for the detection of Fe(III)

V. Špringer and I. Benedikovič

Komenský University, Bratislava

Abstract: Cinnamohydroxamic acid (I) and Fe(III), 1:1 form a H₂O-sol. violet complex at pH 0.5-1.7. The reaction can be performed in a test tube (pD 5.7 where D = sensitivity), on a test plate (pD 4.7) and on filter paper (pD 4.7). The sensitivity can be increased by extg. the complex into amyl alc. with a change to a red color (pD 6.7). The reaction of I-Fe(III) with a large molar excess Fe(III) (1:500) was studied. Na, K, Ag, NH4, Ca, Ba, Sr, Mg, Zn, Hg(II), Cd(II), Mn(II), Fe(II), Bi(III), Ce(III), and Ti(IV) have no effect. A 100-fold amt. of Cu(II), Ni(II), or Co(II) interferes. SO₄^2-, SO₃^2-, NO₃^-, ClO₄^-, Cl^-, Br^-, BO₂^-, H₂O₂, OAc^-, and tartrate have no effect. PO₄^3- decreases the sensitivity. NO₂^- and V(V) require addn. of excess H₂O₂; MnO₄^- requires addnl. H₂O₂ and I; oxalate requires addnl. KMnO₄ and H₂O_2. CN^- and F^- must be absent.

Full paper in Portable Document Format: 196a481.pdf (in Slovak)

Chemical Papers 19 (6) 481–484 (1965)