A flow injection method has been developed for the determination of uranium in seawater combining the
on-line preconcentration with spectrophotometric detection. An aliquot (10 mL) of the seawater sample
adjusted to pH 5.5 was injected into the analytical system and uranium was adsorbed on the column
packed with styrene-divinylbenzene copolymer resin (Bio-Beads SM-2) modified with dodecylamidoxime which showed high selectivity to uranium. Uranium was then eluted with 0.01 M hydrochloric
acid and detected spectrophotometrically after the reaction with Chlorophosphonazo III. Interference
from calcium and strontium was masked with cyclohexanediaminetetraacetic acid added to the chromogenic reagent solution. The sample throughput, the detection limit (3), and the preconcentration
factor were 23 per hour, 0.13g/L, and 20, respectively, when the sample injection volume was kept at
10 mL. The precision at the 2g/L level was less than 4% (RSD). The proposed method was applied to
the determination of uranium in the seawater samples collected off the Boso peninsula, Japan and the
uranium concentration was found to beca.3g/L, which is close to the literature data. The yield of the
recovery test ranged from 95% to 99%
A flow injection method has been developed for the determination of uranium in seawater combining the
on-line preconcentration with spectrophotometric detection. An aliquot (10 mL) of the seawater sample
adjusted to pH 5.5 was injected into the analytical system and uranium was adsorbed on the column
packed with styrene-divinylbenzene copolymer resin (Bio-Beads SM-2) modified with dodecylamidoxime which showed high selectivity to uranium. Uranium was then eluted with 0.01 M hydrochloric
acid and detected spectrophotometrically after the reaction with Chlorophosphonazo III. Interference
from calcium and strontium was masked with cyclohexanediaminetetraacetic acid added to the chromogenic reagent solution. The sample throughput, the detection limit (3), and the preconcentration
factor were 23 per hour, 0.13g/L, and 20, respectively, when the sample injection volume was kept at
10 mL. The precision at the 2g/L level was less than 4% (RSD). The proposed method was applied to
the determination of uranium in the seawater samples collected off the Boso peninsula, Japan and the
uranium concentration was found to beca.3g/L, which is close to the literature data. The yield of the
recovery test ranged from 95% to 99%
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