阴离子树脂-活性炭分离富集等离子体发射光谱法测定富钴锰结壳中的痕量金银铂钯   总被引：10，自引：1，他引：10  

李展强张汉萍  张学华李其英 李锡坤 《岩矿测试》2005,24(2):141-144

采用717阴离子树脂活性炭联合交换分离富集技术,电感耦合等离子体发射光谱法同时测定富钴锰结壳中痕量金、银、铂、钯。方法检出限四元素分别为:Au1. 3、Ag0. 4、Pd0. 6、Pt4. 8ng/g。样品加标回收率在89. 0% ~110. 3%,相对标准偏差3. 5% ~7. 8% (n=4)。方法已用于富钴锰结壳中痕量金银铂钯的测定。  相似文献   

内标和快速共沉淀-火焰原子吸收光谱法测定食盐中的镉   总被引：3，自引：0，他引：3  

苏耀东  秦立俊李静 陈龙武 《岩矿测试》2005,24(3):201-204

探讨了用火焰原子吸收法测定以（2-吡啶偶氮）-2-萘酚-Ni（Ⅱ）为共沉淀体系，以Mn（Ⅱ）为内标，在pH=9．0的条件下快速共沉淀分离富集食盐中的痕量Cd。当试液为100mL时，方法的检出限为5．7μg/L，加标回收率为96％～101％，相对标准偏差（RSD，n=6）〈5％，基本消除了基体干扰。  相似文献   

Structural Characterisation of Organic Matter in Fine Tropospheric Aerosol by Pyrolysis-Gas Chromatography-Mass Spectrometry     

A. Gelencsér  T. Mészáros  M. Blazsó  Gy. Kiss  Z. Krivácsy  A. Molnár  E. Mészáros 《Journal of Atmospheric Chemistry》2000,37(2):173-183

The organic matter in tropospheric aerosol plays animportant, yet undetermined role in atmosphericprocesses. The bulk of organic carbon representing asignificant part of the fine aerosol mass is bound toa polymeric matter whose structure and properties areto date largely unknown. Here we use thefingerprinting technique of derivatization pyrolysis-gas chromatography-massspectrometry tosubstantiate that in terms of chemical structure partof this polymer in rural aerosol in summer can beregarded as natural humic matter. We suggest thatthese compounds are likely to be directly emitted bybiogenic sources.  相似文献   

感耦等离子体质谱法测定商代原始瓷中的稀土   总被引：7，自引：1，他引：6  

古丽冰  邵宏翔 《岩矿测试》2000,19(1):70-71

以混合酸溶样电感耦合等离子体质普法测定了商代古陶瓷中稀土元素,采用Ｉｎ内标补偿测定信号所受的影响,同时讨论了干扰因素及其校正方法。方法经国家一级标准物质分析验证,其分析结果与标准植吻合;经１０次重复测定同一样品,方法的精密度ＲＳＤ在１．６％～７．３％。该方法已用于不同地区的商瓷样品中稀土的测定,并对古瓷的地球化学特征作了探讨。  相似文献   

Determination of the phase boundary between ilmenite and perovskite in MgSiO3 by in situ X-ray diffraction and quench experiments     

K. Kuroda  T. Irifune  T. Inoue  N. Nishiyama  M. Miyashita  K. Funakoshi  W. Utsumi 《Physics and Chemistry of Minerals》2000,27(8):523-532

Determination of the phase boundary between ilmenite and perovskite structures in MgSiO₃ has been made at pressures between 18 and 24 GPa and temperatures up to 2000 °C by in situ X-ray diffraction measurements using synchrotron radiation and quench experiments. It was difficult to precisely define the phase boundary by the present in situ X-ray observations, because the grain growth of ilmenite hindered the estimation of relative abundances of these phases. Moreover, the slow reaction kinetics between these two phases made it difficult to determine the phase boundary by changing pressure and temperature conditions during in situ X-ray diffraction measurements. Nevertheless, the phase boundary was well constrained by quench method with a pressure calibration based on the spinel-postspinel boundary of Mg₂SiO₄ determined by in situ X-ray experiments. This yielded the ilmenite-perovskite phase boundary of P (GPa) = 25.0 (±0.2) – 0.003 T (°C) for a temperature range of 1200–1800 °C, which is generally consistent with the results of the present in situ X-ray diffraction measurements within the uncertainty of ∼±0.5 GPa. The phase boundary thus determined between ilmenite and perovskite phases in MgSiO₃ is slightly (∼0.5 GPa) lower than that of the spinel-postspinel transformation in Mg₂SiO₄. Received: 19 May 1999 / Accepted: 21 March 2000  相似文献   

Effect of pressure on the thermal expansion of MgO up to 8.2 GPa     

J. Zhang 《Physics and Chemistry of Minerals》2000,27(3):145-148

Isobaric volume measurements for MgO were carried out at 2.6, 5.4, and 8.2 GPa in the temperature range 300–1073 K using a DIA-type, large-volume apparatus in conjunction with synchrotron X-ray powder diffraction. Linear fit of the thermal expansion data over the experimental pressure range yields the pressure derivative, (∂α/∂P) _T , of −1.04(8) × 10⁻⁶ GPa⁻¹ K⁻¹ and the mean zero-pressure thermal expansion α_{0, T}  = 4.09(6) × 10⁻⁵ K⁻¹. The α_{0, T} value is in good agreement with results of Suzuki (1975) and Utsumi et al. (1998) over the same temperature range, whereas (∂α/∂P) _T is determined for the first time on MgO by direct measurements. The cross-derivative (∂α²/∂P∂T) cannot be resolved because of large uncertainties associated with the temperature derivative of α at all pressures. The temperature derivative of the bulk modulus, (∂K _T/∂T) _P , of −0.025(3) GPa K⁻¹, obtained from the measured (∂α/∂P) _T value, is in accord with previous findings. Received: 2 April 1999 / Revised, accepted: 22 June 1999  相似文献   

蒙脱石中Cu2+的吸附态研究   总被引：9，自引：1，他引：8  

何宏平  郭九皋  谢先德  彭金莲 《地球化学》2000,29(2):198-201

对在ＰＨ≤４．５、痕量浓度条件下吸附了Ｃu＾２＋的蒙脱石的Ｘ射线衍射（ＸＲＤ）进 行了研究。该蒙脱石的ｄ（００１）由原始蒙脱石的１．４７９ｎｍ变为１．５２３ｎｍ,说明水合铜离子置换了蒙脱石的层间阳离子;在该蒙脱石的ＥＰＲ谱中记录到了ｇ＝２．０７、ｇ ＝２．１４精细结构线和ｇ为约２．７～２．２超精细结构线三组有关Ｃu＾２＋ 的信号,说明其中的Ｃu＾２＋有三种不同的结构状态。同时,该蒙脱石热处理产物的ＥＰ  相似文献   

云南小湾断层泥矿物特征及其构造意义   总被引：2，自引：0，他引：2       下载免费PDF全文

张秉良  何昌荣  刘行松 《地质科学》2000,35(2):197-205

通过显微镜观察、X射线衍射、红外光谱和化学分析等方法研究云南小湾断层泥中伊利石矿物特征,结果显示:(1)断层泥中的伊利石发育定向排列,其集合体呈扭折褶皱变形,有时呈流状构造充填在碎屑之间;(2)伊利石的X射线衍射特征为△[(002)-(001)]>8°,Ir>1,BB₁<4°,属ISII有序混层,膨胀层约占15%,晶胞参数b₀=8.993Å,1M多型结构;(3)层间阳离子2Ca+Na+K≈1,MgO含量变化1.05%-2.89%,结晶水(H₂O⁺)含量变化4.43%-5.23%。综合上述特征认为,断层泥伊利石不同于其它成因的伊利石,它是断层活动的直接产物,因此,根据它的特征可以推测断层活动机制。  相似文献   

亚热带富铁土的磁学性质及其磁性矿物学   总被引：7，自引：3，他引：4  

卢升高 《地球物理学报》2000,43(4):498-504

通过５５个亚热带富铁土的磁化率（χ）、频率磁化率(χ_ｆｄ)、非滞后剩磁（ＡＲＭ）和饱 和等温剩磁（ＳＩＲＭ）等磁性参数测定,结合氧化铁化学形态分析和矿物鉴定,初步明确了亚热 带富铁土的磁学特征及其磁性矿物．磁测数据表明富铁土中存在强磁性的矿物,其磁化率χ 与土壤游离氧化铁（Ｆｅ_ｄ）含量呈极显著指数正相关（Ｒ^２＝０．５９７１）,频率磁化率χ_ｆｄ与土壤游离氧 化铁含量呈极显著直线正相关（Ｒ^２＝０．４２８９）．富铁土的χ_ｆｄ和非滞后磁化率χ_ＡＲＭ。值表明土壤 中的磁性矿物以超顺磁性（ＳＰ）和稳定单畴（ＳＳＤ）颗粒为主,富铁上的χ和χ_ＡＲＭ呈极显著直线 正相关（Ｒ^＝ ０．９４２９）,证明富铁土的磁性是由风化成土过程产生的 ＳＰ和 ＳＳＤ磁性颗粒贡献 的．矿物磁测结合Ｘ－衍射证明富铁土中的氧化铁矿物由赤铁矿、磁赤铁矿和针铁矿组成。  相似文献   

CT对隐性骨折的诊断价值   总被引：1，自引：0，他引：1  

王先泉  李新华 《CT理论与应用研究》2000,9(3):48-51

目的：探讨ＣＴ对隐性骨折的诊断价值。方法：回顾性分析８４例隐性骨折患者,其中男６４例,女２０例,年龄７￣７３岁,平均４２．６岁。所有患者均行轴位或冠状位ＣＴ扫描。结果：扫描发现脊柱骨折２８例,髋臼骨折８例,胫骨平台骨折１１例,眶骨骨折１２例,颞骨骨折１３例。肩胛骨骨折１２例。结论：ＣＴ对隐性骨折的诊断具有极大价值,对于高度怀疑骨折而Ｘ线片未显示骨折征象的患者应进一步给予ＣＴ扫描检查。  相似文献