中国东部新生代玄武岩的地球化学（II）Sr,Nd,Ce同位素组成

对有代表性的中国东部新生代玄武岩的Ｓｒ、Ｎｄ和Ｃｅ同位素组成进行了系统的研究，结合系统的微量元素研究结果，进一步阐明其地幔源区同位素组成的不均一性；利用Ｃｅ、Ｎｄ同位素地球化学给出的信息，探讨富集Ｉ型（ＥＭ Ｉ）地幔端元的成因。     

固相合成法制备六角薄板状CeO2纳米晶

以分子量为600的聚乙二醇(PEG600)为分散剂,通过Ce(NO3)3.6H2O和无水Na2CO3的固相反应制备出混相碳酸铈盐[Ce2O(CO3)2.H2O和Ce2(CO3)3.8H2O]前驱体,热分解该前驱体获得CeO2纳米晶。XRD研究表明,产物归属于立方晶系的方铈石相,空间群为Fm3m。混相碳酸铈盐前驱体的反应活性较高,350℃热处理已使其分解完全,获得平均晶粒度仅为6.5 nm的纯CeO2纳米粉体,600℃焙烧产物的平均晶粒度达到27.1 nm,该温度下获得的CeO2微粒呈薄板状,板面平滑,大体呈规整的六边形,板径主要在30 nm~40 nm之间,径/厚比为5~7。在透射电镜下直接观察到的平均颗粒度与采用Scherrer公式计算的平均晶粒度相近,反映出由此固相合成法制备的纳米粉体颗粒较为均匀,从团聚体生长出来的大颗粒较少。     

红色岩层中白点成因一解

在赣粤一带常见的红色岩层中,每有灰白色斑点现于岩石面上,尤以红砂岩及红页岩中最为显著。斑点大小不一,以自数公厘至二三公分者为最普通,其切面多具圆形或椭圆形,亦时有作     

湖南的矽藻土

矽藻土过去注意的人较少,甚至有的人听到这个名词会感觉到陌生,这就是因为中国过去在反动政府统治时期工业落后,以至这些有用的工业资源很少人研究和运用过现在,我们人民祖国的工业在人民政府的领导下已有长足的进步,像矽藻土这种     

赣南花岗岩风化壳型稀土矿床中纳米级稀土矿物的研究

为揭示次生风化成因稀土矿物的赋存形态和分布特征,对赣南安远岗下稀土矿区花岗岩风化壳剖面进行了研究。采集风化壳不同层位的样品进行分选、提纯,场发射扫描电镜和透射电镜研究结果表明,与稀土矿物紧密相关的粘土矿物是高岭石和埃洛石等,风化壳中发现的纳米级稀土矿物既有附着于其他矿物表面的微细颗粒,也有呈集合体存在的稀土矿物(可能为方铈石),这一现象有助于进一步认识风化壳稀土矿床的形成过程。     

Hydrolysis Activities of the Particle of Agarose-Ce^4＋ Complex for Compounds Containing Phosphodiester or Peptide Bonds

Hydrolysis activities of PACC （particle of agarose-Ce^4＋ complex, newly made through double emulsification） for compounds containing phosphodiester or peptide bonds were studied. The results showed that PACC could hydrolyze organophosphorous pesticides not only in water but also in vegetable juice or tea extract. Hydrolysis rates of methamidophos, omethoateand chlorpyrifos in water are 32.39%, 27.12% and 46.62% respectively, those of chlorpyrifos and methamidophos in mung sprout juice 38.28% and 35.45% respectively, and that of chlorpyrifos in tea extract 59.76%. Hydrolysis rates of BSA （bovine serum albumin） in water and protein in tea extract by PACC increase by 54.30% and 86.46% respectively as compared with the control.     

情迷祖母绿

正说到祖母绿,很多人会被它的名字误导,以为它是一种老年人佩戴的宝石。其实不然。祖母绿的名称来自希腊语"Smaragdos",源于古法语"Esmeralde",意指绿色的宝石。"祖母绿"是我国的音译名称。一直以来,祖母绿深受各年     

Preparation and characterization of magnetic resin made from chitosan and cerium

In this study,the water-based ferromagnetic fluid and magnetic resin made from chitosan and cerium complex(MRCCC) were successfully prepared by using the chemical co-precipitation technique and by the reversed-phase suspension cross-linking polymerization.MRCCC presented uniform and narrow particle size distribution as determined by the Laser Particles Sizer.The Inductively Coupled Plasma-Atomic Emission Spectrometry(ICP-AES),Fourier transform infrared spectroscopy(FT-IR),differential scanning calorimetry(DSC)and X-ray powder diffraction(XRD)study demonstrated that there were iron and cerium existing in MRCCC.The movement of MRCCC under magnetic field proved its magnetic property.The swelling kinetics in water or solutions with different pH indicated that MRCCC could be applied in solutions with pH greater than 1.0.The ferromagnetic fluid particles were stable in MRCCC soaked in solutions with pH >2.0.In view of these results,MRCCC can be used as material for separation,clarification,adsorption,sustained release and hydrolysis activity.     

氟铈硅磷灰石—产自加拿大Mont St.Hilaire的新矿物

新矿物氟铈硅磷灰石产自加拿大魁北京省的ＭｏｎｔＳｔ．Ｈｉｌａｉｒｅ地区，赋存于霞石正长岩、大理岩捕虏体，方钠石正长岩捕虏体和伟晶岩岩墙中。