K. Grudpan et al., FLOW-INJECTION SPECTROPHOTOMETRIC DETERMINATION OF URANIUM WITH IN-VALVE ION-EXCHANGE COLUMN PRECONCENTRATION AND SEPARATION, Analyst, 120(8), 1995, pp. 2107-2110
An in-valve column containing Duolite C-225(H) resin for preconcentrat
ion and separation flow injection determination of uranium is describe
d. Uranyl ions loaded on the column were eluted with 1 mol 1(-1) HCl a
nd mixed with a stream of buffer and masking solution [triethanolamine
(1 mol 1(-1)) and 1,2-cyclohexanediaminetetraacetic acid (0.7% m/v)].
After passing through a glass bead column the complex product was con
tinuously monitored at 530 nm. Calibration by time (or volume) using a
single standard was performed up to 7 mu g of U. The detection limit
(3 sigma) and relative standard deviation were 0.27 mu g of U and 2.1%
(for 2 mu g; n = 12), respectively. Interferences of some ions were s
tudied. Applications to the determination of uranium in rock and water
samples are described.