敦煌地块敖包山晶质石墨矿集区矿床地质特征、变质岩原岩恢复及形成环境

【研究目的】为解决敦煌地块敖包山晶质石墨矿集区晶质石墨矿床研究程度较低的问题,通过对该区变质岩原岩特征及古构造环境进行深入研究,以期为该区的成矿规律研究提供地质依据。【研究方法】本文运用岩石地球化学方法对该区变质岩进行原岩恢复,探讨其形成时的古构造环境。【研究结果】二云石英片岩、黑云斜长片麻岩和斜长角闪岩均具有轻稀土富集的特征。斜长角闪岩K₂O2O,具有弱的Nb、Ta亏损和强烈的Zr、Hf亏损,LREE/HREE=2.21～6.97,轻重稀土元素分馏程度较弱;黑云斜长片麻岩和二云石英片岩K₂O>Na₂O,富集大离子亲石元素Rb、K等,亏损Ba、Nb、Ta、Zr、Hf、Ti、Sr等元素,具有明显的Eu负异常,LREE/HREE平均值分别为12.44和8.89,轻重稀土元素分异较强烈。【结论】敖包山晶质石墨矿集区变质岩原岩形成于浅水区,水动力环境较弱。斜长角闪岩的原岩为亚碱性基性火山岩,形成于岛弧环境;二云石英片岩和黑云斜长片麻岩的原岩为页岩、黏土岩,构造环境为活动大陆边缘,古沉积环境...     

佳木斯地块大型晶质石墨矿集区的形成和演化

佳木斯地块大型晶质石墨矿集区是世界上少有的大型矿集团。文章论述了该大型矿集区形成的两个基本条件，即巨量的生物有机碳在大陆边缘海还原环境下形成巨厚堆积，区域动力热流变质作用使非晶质有机碳沉积物转变为晶质石墨，从非矿床变成为可利用的工业矿床。晶质石墨矿床形成后，又经历了混合岩化作有的改造和印支、燕山运动的构造破坏等，最终成为现在面貌的矿集区。     

APDC－MIBK萃取石墨炉原子吸收法测定地质样品中痕量钯

ＡＰＤＣ－ＭＩＢＫ萃取石墨炉原子吸收法测定地质样品中痕量钯伊丽莹，张海政（中国科学院地质研究所北京１０００２９）关键词钯，ＡＰＤＣ－ＭＩＢＫ，萃取，石墨炉原子吸收法《中图法》分类号Ｐ６１８．５Ｏ６５７．３１近年来金矿源岩研究引起国内外地质学家的极大关...     

人造金刚石合成片中再结晶物质的空间分布

通过电子显微镜观察，发现金刚石合成片断面的再结晶物质具有分带现象，金刚石晶体出现了再结晶片－板状石墨亚带和枝状石墨亚带中，这一发现有助于深入探讨金刚石的生长条件和形成机理。     

静压催化法石墨－金刚石相变研究

实验证明了在高温高压有金属催化剂参与条件下，石墨到金刚石相变过程的中间相是类球状再结晶石墨。研究了类球状再结晶石墨的形成与温度压力的关系。     

Dechlorination of trichloroethylene in solution over supported nano zero valent Fe and Cu/Fe bimetal on exfoliated graphite

Degradation of organic halides by reductive dehalogenation promoted by zerovalent metals is a very active research area. The use of nano-sized particles of zero valent iron （ZVI） or bimetallic combinations of ZVI currently attracts the most attention due to their high surface areas and high reactive activity. The introduction of second catalytic metals, such as Pd, Pt, Cu, or Ni, results in an even higher dehalogenation rate. The supported zero-valent iron materials have higher activity and greater flexibility for environmental remediation applications than other forms of ZVI. Nano ZVI supported on micro-scale exfoliated graphite was prepared by using KBH4 as the reducing agent in the H2O/ethanol solution of Fe^2＋ in the laboratory. Then the ethanol solution of Cu^2＋ was added to the fleshly prepared wet supported nano ZVI. The Fe/Cu bimetallic particles supported on the graphite were obtained because of the reduction and deposition of Cu on the Fe surface. The TEM image showed that iron particles were highly dispersed on the surface of graphite. In this study, supported zero valent Cu/Fe bimetallic nanoparticles were used for the dehalogenation of trichloroethylene （TCE） in batch experiments. The dechlorination rate of supported zero valent Fe/Cu bimetallic nanoparticles was greater than the supported nano ZVI. Supported Cu/Fe bimetal with 4 wt% Cu had the fastest dehalogenation rate than that with different content of Cu. When the nana FeO dosage was 5 g/L in the dehalogention system, 8 mg/L of TCE was completely dechlorinated within 4 hours. Increasing or decreasing the FeO dosage, the dechlorination rate could be worse. When the concentration of Fe^2＋ was 0.05 mol/L during the preparation by KBH4 reduction, the nano Cu/Fe particles exhibited the spheral shape with 50-80 nm in size. When the concentration of Fe^2＋ was higher （0.2 mol/L）, the nano particles were the palpus structure and had the poor dehalogenation effect on the TCE.     

石墨炉原子吸收法测定全血中的铅

铅是污染人类环境，损害人体健康的有害元素。环境中的铅（空气、粮食、餐具、涂料、油漆、化妆品等）通过皮肤、消化道、呼吸道进行血液。通过血铅的测定，并结合生理、生化、临床等其它指标，可用于临床诊断或辅助诊断。