title: [Determination of uranium in spinach].
abstract: After the severe accident at the Fukushima-1 Nuclear Power Plant in March 2011, radioactive contamination of food has become a matter of serious concern in Japan. There is considerable information about radioactive iodine and cesium, but little is known about uranium contamination. We determined uranium content in spinach by the Japanese official method (Manual on Radiation Measurement of Food in Emergency Situations). In the preliminary study, we confirmed that the use of a microwave digestion system for preparing the test solution of spinach could shorten the testing time and give acceptable results. The manual recommends the use of two elements (Tl and Bi) as internal standards for measurement of uranium by ICP-MS. We found that Tl was more suitable than Bi to quantify trace amounts of uranium in spinach. However, it was necessary to determine Tl or Bi concentrations in the sample before analysis, since some samples of spinach contained significant amounts of these elements. The uranium contents of 9 spinach samples bought in April and May 2011 were less than 10 μg/kg, which are very low compared to the provisional regulatory limit in Japan.
authors.affiliation: Osaka City Institute of Public Health and Environmental Sciences, Osaka 543–0026, Japan. e-kishi@city.osaka.lg.jp
authors.forename: Eri
authors.initials: E
authors.lastname: Kishi
authors.forename: Aiko
authors.initials: A
authors.lastname: Yutani
authors.forename: Asako
authors.initials: A
authors.lastname: Ozaki
authors.forename: Masanao
authors.initials: M
authors.lastname: Shinya
authors.forename: Kenshi
authors.initials: K
authors.lastname: Katahira
authors.forename: Tomoko
authors.initials: T
authors.lastname: Ooshima
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Shimizu
mesh_terms: D005502:Food / Q000592:standards*; D005504:Food Analysis / Q000295:instrumentation / Q000379:methods*; D005507:Food Contamination, Radioactive / Q000032:analysis*; D059022:Food Safety / Q000379:methods*; D062406:Fukushima Nuclear Accident; D013058:Mass Spectrometry / Q000379:methods*; D008872:Microwaves; D018788:Radioactive Hazard Release; D018724:Spinacia oleracea / Q000737:chemistry*; D013997:Time Factors; D014501:Uranium / Q000032:analysis*
chemical_list: D014501:Uranium