@article{oai:repo.qst.go.jp:00076800,
 author = {Takahashi, Hiroaki and Izumoto, Yukie and Matsuyama, Tsugufumi and Yoshii, Hiroshi and Yukie, Izumoto and Tsugufumi, Matsuyama and Hiroshi, Yoshii},
 issue = {5},
 journal = {X-ray spectrometry},
 month = {Sep},
 note = {A new method based on dispersive microsolid phase extraction using graphene oxide (GO) as a solid adsorbent and total reflection X‐ray fluorescence (TXRF) spectrometry is proposed for trace determination of uranium. In the developed methodology, a suspension of GO was injected into uranium‐spiked multielement solutions including rubidium; after filtration, the membrane filter with collected GO was placed in a small volume of internal standard acid solution and the eluent containing uranium was deposited onto a fluorine resin‐ coated slide glass, which is a disposable sample stage. Using GO was effective for removal of rubidium from the measurement solution to avoid interference between Rb Kα peak and U Lα peak. The high enrichment factor of 150 enables obtaining uranium detection limits of 0.042, 0.087, and 0.12 μg L−1 for ionic strength of 0.01, 0.1, and 1 mol L−1, respectively. Such low detection limits were obtained by using a benchtop TXRF spectrometer with 5‐min measurement. The proposed method is suitable for trace uranium determination in water, including high salinity samples.},
 pages = {366--374},
 title = {Trace determination of uranium preconcentrated using graphene oxide by total reflection X‐ray fluorescence spectrometry},
 volume = {48},
 year = {2019}
}