岩石矿物中锆的测定方法研究     

时晓露  马玲  刘瑱  朱炳文 《安徽地质》2016,26(2):158-160

测定岩石类样品中的Zr含量,酸溶经常结果偏低,碱溶通常较难获得较低的检出限。本文选取了不同岩性的岩石类国家标准物质GBW07104、GBW07106、GBW07107、GBW07114、GBW07835、GBW07836、GBW07837作为实验样品,分别采用酸溶后复溶、Na2O2碱熔、赶硅后Na2CO3和Na2B4O7三种前处理方法,对电感耦合等离子体质谱仪进行参数优化后上机测定,结果表明:对样品赶硅后加入少量Na2CO3和Na2B4O7混合试剂高温熔融处理岩石样品后,锆的测量值准确度高,而且获得了最低的检出限,同时缩短了方法流程,操作快捷。该方法更适用于各类岩石样品锆的测定。  相似文献   

两个大洋多金属结核标准物质中27种元素的等离子体质谱法测定     

胡广林  蔡毅华  杨朝勇  庄峙厦  王小如  黄奕普 《海洋学报》2002,24(1):47-52

从样品制备、仪器操作参数最佳化、内标补偿等几方面着手,利用两个标准物质(GSPN-2,GSPN-3)发展了大洋多金属结核中27种元素的等离子体质谱(ICP-MS)测定方法.这27种元素包括Ba,Ce,Co,Cu,Dy,Er,Eu,Gd,Ho,La,Li,Lu,Mo,Nd,Pr,Sb,Sc,Sm,Tb,Th,Tm,U,V,W,Y,Yb和Zn.各元素测定值与保证值相当吻合.对GSPN-2和GSPN-3,Ba,Sb,Sc,Y,Zn等5种元素可用外标校准法准确测定,其平均回收率(n=3)在91.4%～106.9%之间;可用内标(103Rh)校准法准确测定其他22种元素,其平均回收率(n=3)在89.4%～110.2%之间;各元素3次测定的相对标准偏差(RSD)为0.0%～11.0%.  相似文献   

Effect of general loss-cone distribution function on electrostatic ion-cyclotron instability in an inhomogeneous plasma: particle aspect analysis     

Ruchi Mishra  M. S. Tiwari 《Earth, Moon, and Planets》2007,100(3-4):195-214

The electrostatic ion-cyclotron instability (EICI) in low β (ratio of plasma to magnetic pressure), anisotropic, inhomogeneous plasma is studied by investigating the trajectories of the particles using the general loss-cone distribution function (Dory-Guest-Harris type) for the plasma ions. In particular, the role of the loss-cone feature as determined by the loss-cone indices, in driving the drift-cyclotron loss-cone (DCLC) instability is analysed. It is found that for both long and short wavelength DCLC mode the loss-cone indices and the perpendicular thermal velocity affect the dispersion equation and the growth rate of the wave by virtue of their occurrence in the temperature anisotropy. The dispersion relation for the DCLC mode derived here using the particle aspect analysis approach and the general loss-cone distribution function considers the ion diamagnetic drift and also includes the effects of the parallel propagation and the ion temperature anisotropy. It is also found that the diamagnetic drift velocity due to the density gradient of the plasma ions in the presence of the general loss-cone distribution acts as a source of free energy for the wave and leads to the generation of the DCLC instability with enhanced growth rate. The particle aspect analysis approach used to study the EICI in inhomogeneous plasma gives a fairly good explanation for the particle energisation, wave emission by the wave–particle interaction and the results obtained using this particle aspect analysis approach are in agreement with the previous theoretical findings using the kinetic approach.  相似文献   

1∶20万岩石化探测量碳酸盐岩分析方法研究——等离子体质谱为主的配套分析方法     

戢朝玉  李剑昌  吴列平 《岩矿测试》1998,(2)

研究了碳酸盐岩中基体元素Ｃａ和Ｍｇ对测定痕量元素的影响及消除办法，建立了用等离子体质谱法测定碳酸盐岩石中２６个痕量元素的３个分析流程；并采用Ｘ射线荧光光谱、石墨炉原子吸收光谱、原子荧光光谱等方法配套测定了碳酸盐岩石中１５种主、次量元素。配套方法的检出限、精密度、准确度均符合１∶２０万岩石化探测量碳酸盐岩分析技术指标要求。方法经标样及碳酸盐岩石样品分析验证，其结果与不同实验室、不同方法测定结果相符。  相似文献   

ICP-OES法同时测定进口铜精矿中有害元素     

张伟  顾希  王燕  王辉 《西部资源》2012,(3):119-123

本文优化了进口铜精矿的样品处理技术,通过对影响铜精矿消解的因素和仪器参数进行分析建立了同时测定铜精矿中有害元素的精确方法,回收率在91.7%-96%,并与FAS测试结果进行了比较。  相似文献   

Nonlinear field line resonances. Effect of Hall term on plasma compression: 1D Hall-MHD modeling     

A.S. Lipatov  R. Rankin 《Planetary and Space Science》2009,57(3):404-414

A model is presented that describes the excitation of small-scale density perturbations and electromagnetic fields by standing shear Alfvén waves in a Cartesian geometry. The model includes the effects of plasma betas and the Hall term effects. The characteristics of magnetospheric density cavities and the formation of the significant peak in density are discussed in the paper.  相似文献   

Peculiarities of entropy and magnetosonic waves in optically thin cosmic plasma     

B. V. Somov  N. S. Dzhalilov  J. Staude 《Astronomy Letters》2007,33(5):309-318

The stability problem for small magnetohydrodynamic (MHD) perturbations in an optically thin, perfectly conducting uniform plasma with a cosmic abundance of elements is solved in the linear approximation. The electron heat conduction along the magnetic field and the proton heat conduction across the field are taken into account. We have shown for the first time that the entropy waves can grow exponentially, while the magnetosonic waves are damped in a wide range of physical conditions closest to the conditions in stellar coronae with the proper allowance for radiative losses. Slow magnetosonic waves are damped particularly rapidly. For the solar corona, the calculated damping decrement of slow magnetosonic waves agrees well with the averaged one in 11 quasi-periodic events observed from the TRACE satellite in extreme ultraviolet radiation. Other possible astrophysical applications of the results obtained are briefly discussed.  相似文献   

Loss-Cone Instability and Formation of Zebra Patterns in Type IV Solar Radio Bursts     

A. A. Kuznetsov  Yu. T. Tsap 《Solar physics》2007,241(1):127-143

The loss-cone instability of energetic electrons at double plasma resonance is considered. Conditions required for the formation of a zebra pattern in type IV solar radio bursts are determined. It is shown that electrons with a power-law energetic spectrum can effectively excite upper-hybrid waves at double plasma resonance. Stripes of a zebra pattern become more pronounced with an increase of the loss-cone opening angle and the power-law spectral index. The growth rate at the resonance frequencies decreases with an increase of the cyclotron harmonic number. Interpretation of observations and diagnostics of plasma for the April 21, 2002, event are performed. Conclusions about the impulsive mode of injection of energetic electrons into a coronal arc are made.  相似文献   

Direct Determination of Lead Isotope Ratios by Laser Ablation-Inductively Coupled Plasma-Quadrupole Mass Spectrometry in Lake Sediment Samples   总被引：1，自引：0，他引：1  

Sébastien Aries  Mikael Motelica-Heino  Rémi Freydier  Thierry Grezes  Mireille Polvé 《Geostandards and Geoanalytical Research》2001,25(2-3):387-398

A direct method for the determination of lead isotopic ratios by laser ablation-inductively coupled plasma-quadrupole mass spectrometry (LA-ICP-QMS) is presented. Samples of lake sediments were ground and pressed as pellets before being analysed. Mass bias was corrected by analysing an external calibration sample manufactured with pure silica doped with NIST SRM 981 solution. The efficiency of the mass bias correction was checked by comparing the ICP-MS data with lead isotopic ratios determined by thermal ionisation mass spectrometry (TIMS). The average long term reproducibilities were 0.40%, 0.40%, 0.20% and 0.30% (RSD) respectively for the ²⁰⁶Pb/²⁰⁴Pb, ²⁰⁷Pb/²⁰⁴Pb, ²⁰⁶Pb/²⁰⁷Pb and ²⁰⁸Pb/²⁰⁶Pb ratios. The method was applied to the study of lake sediment samples, in order to determine the amount and origin of historical contamination by lead.  相似文献   

ESR and ICP analyses of the DPRI 500 m drill core samples penetrating through the Nojima Fault, Japan     

Tatsuro Fukuchi  Noboru Imai 《Island Arc》2001,10(3-4):465-478

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