文章基本信息

标题：Dissolution of Functional Materials and Rare Earth Oxides into Pseudo Alveolar Fluid
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作者：Mitsutoshi TAKAYA ; Yasushi SHINOHARA ; Fumio SERITA 等
期刊名称：Industrial Health
印刷版ISSN：0019-8366
电子版ISSN：1880-8026
出版年度：2006
卷号：44
期号：4
页码：639-644
DOI：10.2486/indhealth.44.639
出版社：National Institute of Occupational Safety and Health
摘要：The dissolution rates of rare earth oxides and two types of rare earth containing functional materials into water, saline solution, and Gamble's fluid were measured in order to evaluate the biological effects of rare earth-containing functional materials. The tested materials were yttrium, lanthanum, cerium and neodymium oxides, and neodymium-boron-iron magnet alloy (NdBFe) and lanthanum-mish-metal-nickel-cobalt (LmNiCo) hydrogen-containing alloy. The dissolution rates of the rare earth oxides were very low, resulting in concentrations of rare earth elements in the test solutions of the order of ppb. In the most extreme case, Gamble's fluid dissolved 1,400 times more of the rare earth oxides than pure water. Fairly high concentration of neodymium were found in the dissolving fluids, which means that trace neodymium present as an impurity in each rare earth oxide dissolved preferentially. For yttrium oxide, the ratio of neodymium to yttrium that dissolved in the saline solution was greater than 78,000 to 1, taking into account the amount of each that was originally present in the yttrium oxide.
关键词：Rare earth;Functional materials;Pseudo alveolar fluid;Dissolution test;Biological half-life