Results 1 to 10 of about 153 (104)
Zhejiang Daxue xuebao. Lixue ban, 2007 应用微波消解，不经分离富集，用ICP-MS直接测定了9种茶叶中的15种痕量稀土元素.9种茶叶中轻稀土元素质量浓度较高，其质量浓度占被测稀土总质量浓度的80%以上.除陈香礼普和杭产绿茶稀土元素质量浓度相对较高外，其它茶叶品种间无明显的差异性.稀土元素的检出限均小于10 ng • L-1，各元素测定的RSD(n = 6)为1.85%~19.4%，样品加标回收率为97.1%~99.6%.
XUZi-gang(徐子刚) +2 more
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Zhejiang Daxue xuebao. Lixue ban, 2002 合成了三个稀土8-羟基喹啉的四元配合物,经元素分析、红外、紫外和DTA-TG等手段表征, 确定配合物的化学式为Ln(CClH2COO)2(Q)(HQ)(Ln=Ce, Pr, Nd,HQ=8-羟基喹啉).两个阴离子均配位.8-羟基喹啉同时起中性和负离子配体的作用.
HEHong-yin(何洪银) +1 more
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Shuitu Baochi Xuebao, 2007 模拟酸雨作用下红壤中稀土元素的释放水平大小依次为Pr＞Ce＞Nd＞Tb＞Sm＞La＞Er＞Ho＞Gd＞Dy＞Eu＞Y＞Lu≈Yb,轻稀土元素的释放水平要高于重稀土元素.酸雨对稀土元素的释放有明显的促进作用,且不同元素的CAR1/CCK、CR2/CCK比较接近(CAR1、CAR2和CCK分别表示pH4.5的酸雨、pH3.5的酸雨和对照3种情况下淋出液中稀土元素的含量).CAR1/CCK介于1.43～1.93之间,平均为1.61;CAR2/CCK介于1.76～2.27之间,平均为2.06,经过9 150 ...
许中坚, 张华, 史红文, 刘广深
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Evaluation of Heavy Metals and Rare-Earth Elements in Famous Black Teas at Home and Abroad(国内外红茶重金属及稀土元素的安全性评价) [PDF]
Shipin kexue jishu xuebao, 2017 Using black teas at home and abroad as materials, inductively coupled plasma mass spectro-meter (ICP-MS) method was adopted to determine the content of (Cu), lead (Pb), arsenic (As), mercury (Hg), chromium (Cr), cadmium (Cd) and 16 rare-earth elements ...
WANG Qiushuang(王秋霜) +3 more
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Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT The surging demand for high‐performance NdFeB magnets has made it essential to achieve ultrahigh coercivity while minimizing the consumption of heavy rare earths. To tackle this challenge, this study proposes a Dy/Tb bilayer grain boundary diffusion strategy and systematically investigates the co‐diffusion behavior of Dy and Tb.
Rui Chang +7 more
wiley +1 more source
Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT f–f electronic transitions of rare‐earth elements typically exhibit unique physicochemical properties that benefit the photocatalytic performance of the catalysts containing the elements. Although conventional rare‐earth metal oxides or single‐atom doping in semiconductors have been extensively studied, the construction of heterojunction ...
Yang‐Sen Xu +6 more
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Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT Early diagnosis of liver cancer demands high sensitivity, high specificity, convenience and real‐time monitoring capabilities. However, it encounters challenges such as low concentration of markers, numerous interfering factors, and limitations of detection technologies.
Changsheng Shi +10 more
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Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT Multicomponent transition metal oxides (TMOs) incorporating rare‐earth (RE) elements have emerged as promising materials for the oxygen evolution reaction (OER). However, knowledge of how to regulate the structure of TMO‐based nanomaterials through RE incorporation to enhance catalytic performance remains limited.
Bolin Zhao +6 more
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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Rare earth elements (REEs) play an irreplaceable role in modern technology and industry. However, due to the highly similar physicochemical properties among REEs, their separation remains a significant challenge. Additionally, REEs often exist in low‐concentration solutions, making efficient REE recovery an urgent task.
Miao‐Miao Huang +6 more
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Rare-earth schiff-base complex for styrene polymerization(稀土席夫碱配合物催化苯乙烯聚合)
Zhejiang Daxue xuebao. Lixue ban, 2007 采用简便的方法合成了稀土席夫碱配合物Nd(H2 Salen)2Cl3 •2C2H5OH（H2Salen是指N，N'-disalicylideneethylenediamine), 用红外光谱、元素分析和络合滴定的方法确定了配合物的分子式.发现Nd(H2Salen)2Cl3 ·2C2H5OH与Al(i-Bu)3和CCl4组成的三元催化体系是苯乙烯(St)溶液聚合的良好催化剂.在St/Nd摩尔比为1 000的低催化剂用量下，50 ℃聚合20 h，可以制得50%转化率，粘均相对分子质量为17.5×104 ...
NIXu-feng(倪旭峰) +2 more
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