Solid-phase extraction of ultratrace uranium(VI) in natural waters using octadecyl silica membrane disks modified by tri-n-octylphosphine oxide and its spectrophotometric determination with dibenzoylmethane
M. Shamsipur et al., Solid-phase extraction of ultratrace uranium(VI) in natural waters using octadecyl silica membrane disks modified by tri-n-octylphosphine oxide and its spectrophotometric determination with dibenzoylmethane, ANALYT CHEM, 71(21), 1999, pp. 4892-4895
A simple and reliable method for rapid extraction and determination of uran
ium in natural waters using octadecyl-bonded silica membrane disks modified
with tri-n-octylphosphine oxide (TOPO) and spectrophotometry with dibenzoy
lmethane is presented, Extraction efficiency and the influence of sample ma
trix, type, and optimum amount of extractant, flow rates, and type and mini
mum amount of organic eluent were evaluated, The maximal capacity of the me
mbrane disks modified by 50 mg of TOPO was found to be 4033 mu g of uranium
. The limit of detection of the proposed method is 100 ng/1000 mt. The meth
od was applied to the extraction and determination of uranium in natural wa
ters.