Small Amounts of Uranium in Presence of Iron

Abstract

The direct colorimetric determination of uranium, in the presence of moderate or large amounts of iron, is not possible by other methods. By the 8-quinolinol method, uranium may be determined in the presence of 500 mg. of iron, 50 mg. of copper, 20 mg. of nickel, or 20 mg. of cobalt without prior separations. In conjunction with the hydrolytic separation by which uranium is separated from most of the colored ions but not iron, uranium may be determined colorimetrically, as a routine technique. With an ordinary Beckman spectrophotometer 10 of uranium are easily determined.

The Reactions Of 8-Quinolinol

“…ion Fe(C9H6NO)+2 (251), and the basic salt FeCl(C9HeNO)2 is also known (101). Complex ferric compounds such as the fluoride and phosphate are said to give the same color reaction as the free ferric ion; only the ferrocyanide ion is sufficiently stable to give no color (265). A red ferrous oxinate can be prepared (131,306) but is stable only under reducing conditions (166).…”

Synthesis of surface imprinted nanospheres for selective removal of uranium from simulants of Sambhar salt lake and ground water

“…4. For the functional group quinoline-8-ol, the optimum pH range for extraction of UO 2 2+ is 4.7-8 [28]. Uranyl chemistry is complicated due to hydrolysis phenomenon.…”

Spetrophotometric Determination of Uranium with 3- (2 - Arsonophenylazo) - 4,5 - dihydroxy - 2,7- naphthalenedisulfonic Acid (Trisodium Salt)

“…Modified procedures with dibenzoylmethane were used by Adams and Maeck (1), Francois (3), and Pribil and Jelinek (IS). Other methods for the determination of uranium have been reported by Silverman, Moudy, and Hawley (20) and Nietzel and De Sesa (12). While systematically studying the reactivity of a large number of organic compounds with inorganic ions, it was observed that the uranyl ion gives a deep blue, stable color with the trisodium salt of 3-(2-arsonophenylazo)-4,5 -dihydroxy -2,7 -naphthalenedisulfonic acid (arsenazo).…”