矿石中金的在线固相萃取及缝管火焰原子吸收测定   总被引：3，自引：0，他引：3  

徐淑坤  孙励敬 《岩矿测试》1994,13(3):203-206

介绍了将流动注射在线因相萃取预浓集与石英缝管火焰原子吸收相结合测定矿石中金的方法，用ＸＡＤ－８吸附树脂填充的微型柱（１００μｌ）在６ｍｌ／ｍｉｎ的流速下，从０．５ｍｏｌ／ＬＨＣｌ介质的试样溶液中浓集金氯络合物，再用乙醇洗脱，最后由火焰原子吸收检测，在采样频率为１０３样／ｈ的流速下灵敏度提高４７倍，分析精度为１．３％，检出限为１．０μｇ／Ｌ；在６５样／ｈ的采样频率下灵敏度提高９５倍，检出限可达０．７  相似文献   

Time domain solution for multiple scattering and the coda envelopes     

Long-Sheng Gao  Song Lin Li 《Pure and Applied Geophysics》1990,132(1-2):123-150

This article summarizes work on multiple scattering based on models of media with randomly distributed scatterers. The scatterers are isotropic and statistically uniform. Measuring distance in terms of mean-free pathL _s and time in terms of the mean-free timesL _s/V, whereV is the velocity of scattered waves, we have more convenient dimensionless distance and time. It can be shown that after the dimensionless time equals 0.65 energy contributed from multiple scattering becomes predominant. Thus the later coda reflects the effect of multiple scattering rather than single scattering. Treating the seismic record, including starting and tail parts, as a whole, the diffusion theory predicts that at a dense distribution of scatterers and a small distance between source and receiver, codas reflect mainly intrinsicQ _i. Of course, this conclusion is coincident with the presumption of the diffusion theory,Q _s>Q _i. However, from a new integral equation of multiple scattering, which deals with the scattered waves and primary waves separately, the conclusion is similar but clearer. This article quotes the new expression for coda energy in two-dimensional space. It shows that if the receiver is close to the source, the coda decay reflects only intrinsicQ _i, then as the distance increases, effects of scatteringQ _s, are involved in the decay feature. The theoretical plots of coda decay show that it seems in most cases in the earthQ _i should not be smaller than one tenth ofQ _s.Project Sponsored by the Joint Earthquake Science Foundation of China.  相似文献   

苏皖凹凸棒石矿物红外光谱特征研究   总被引：13，自引：0，他引：13  

郑自立  田煦 《岩石学报》1990,6(2)

苏皖凹凸捧石粘土矿物包括沉积、风化及火山碎屑蚀变三种成因类型。成矿物质来源于内陆浅水湖盆水下玄武岩风化蚀变及地表玄武岩的风化。不同成因类型的凹凸棒石在矿物晶体结晶程度上有较大差异。通常,由风化作用生成并与碳酸盐共生的沉积型凹凸棒石结晶程度低,较纯的并与硅质岩共生的沉积型凹凸棒石结晶程度高。它们在红外吸收光谱特征上表现为:前者红外振动吸收带分裂程度低,吸收峰弱且峰形钝。后者红外振动吸收带分裂程度高,吸收峰尖锐。因此研究凹凸捧石的红外吸收光谱特征可基本上区分出它们的成因类型。本文还对凹凸棒石红外吸收光谱振动波数带进行了划分,并对相应的振动类型作了探讨。  相似文献   

叶蜡石、高岭石和迪开石的吸收光谱研究   总被引：3，自引：0，他引：3  

张惠芬  杨振国等 《矿物学报》1990,10(1):23-28

对不同地区叶蜡石、高岭石、迪开石的吸收光谱测量及其高斯谱拟合说明，三各矿物的吸收光谱均由一个吸收边和三个吸收峰叠加而成。主吸收峰在562nm左右，峰高以迪开石为最大，高岭石次之，叶蜡石最低。同一地区不同颜色的叶蜡石，其主吸收峰位置随铁含量的增加向短波方向移动，相对峰高也随之增大。叶蜡石的颜色主要取决于主吸收峰的位置、高度和吸收边位置。可以认为，此吸收边为Fe^3 →O^2-荷移谱的低能拖尾部分，吸收峰则为铁离子的晶场谱带或晶场谱与Fe^2 →Fe^3 荷移的叠加。  相似文献   

新疆绿柱石宝石辐照致色机制的吸收光谱研究   总被引：1，自引：0，他引：1  

康雷雅  王天雕 《矿物岩石》1991,11(2):27-30

本文对新疆阿尔泰天然淡蓝、浅蓝宝石级绿柱石辐照前后及退火处理伴随着颜色改变的吸收光谱等进行了分析讨论,认为天然淡蓝、浅蓝色绿柱石经~(60)Co-γ辐照变成黄绿色,其原因主要归因于遂道中Fe~(2-)向Fe~(3+)的转变和八面体中Fe~(3+)和配位体O~(2-)的电荷转移。  相似文献   

On the scavenging of SO2 by cloud and rain drops: IV. A wind tunnel and theoretical study of the absorption of SO2 in the ppb(v) range by water drops in the presence of H2O2     

A. Waltrop  S. K. Mitra  A. I. Flossmann  H. R. Pruppacher 《Journal of Atmospheric Chemistry》1991,12(1):1-17

An experimental study involving the Mainz vertical wind tunnel is described where the rate of SO₂ removed from the air by freely suspended water drops was measured for SO₂ concentrations in the gas phase ranging between 50 and 500 ppb, and for various H₂O₂ concentrations in the liquid phase. In a first set of experiments, the pH inside the SO₂ absorbing drops was monitored by means of colour pH indicators added to the drops. In a second set of experiments, the amount of SO₂ scavenged by the drops was determined as sulfate by an ionchromatograph after the drops had been removed from the vertical air stream of the wind tunnel after various times of exposure to SO₂. The results of our experimental study were compared with the theoretical gas diffusion model of Walcek and Pruppacher which was reformulated for the case of SO₂ concentrations in the ppbv(v) range for which the main resistance to diffusion lies in the gas phase surrounding the drop. Excellent agreement between experiment and theory was obtained. Encouraged by this agreement, the theory was used to investigate the rate of sulfate production inside a drop as a function of pH. The sulfate production rate, which includes transport and oxidation, was compared with the production rate based on bulk equilibrium, as cited in the literature.  相似文献   

小体积萃取-石墨炉原子吸收法测定高纯硝酸钡中纳克级重金属元素     

董高翔  熊采华  汪康康  陈超英 《岩矿测试》1991,(4):287-290

本文研究了石墨炉原子吸收光谱法测定高纯硝酸钡中超痕量重金属元素的分析技术。提出在大量钡基体存在时,采用小体积萃取体系APDC-MIBK同时萃取纳克级的Fe、Cu、Co和Ni。该法具有灵敏度高、无干扰、操作方便和减少沾污等特点。方法检出限为:Fe 7.2ng/g、Cu 12.8ng/g、Co 4.4ng/g和Ni 6.7ng/g。应用于红外光纤原料硝酸钡、硝酸铝中痕量重金属的测定,效果良好。  相似文献   

无载气氢化物发生－石英缝管捕集原子吸收光谱法测定地质试样中的铋     

陈恒武  褚人才  吴德秀 《岩矿测试》1994,(4):298-301

文章介绍石英缝管原子捕集技术在氢化物－火焰原子吸收光谱法测定Ｂｉ中的应用。采用自制的无载气氢化物发生装置，对实验条件进行了最佳化。实验结果表明，原子捕集技术的应用使氢化物－火焰原子吸收法的灵敏度提高２．２倍；方法检出限（３σ）达２．５ｎｇ；２０ｎｇ／ｍｌＢｉ的标准溶液１０次测定的ＲＳＤ为２．９％。方法用于地质标样中微量Ｂｉ的测定，结果与推荐值符合。  相似文献   

用双硫腙－泡沫塑料反相色层萃取原子吸收法测定废水中的微量银   总被引：1，自引：0，他引：1  

衷明华  乐长高 《华东地质学院学报》1994,(4)

本文研究了双硫腙负载的聚氨酯泡沫塑料对水溶液中银离子的反相色层萃取行为，试验了Ｐｈ，流速、洗脱液及洗脱方法的影响。回收率试验表明，该法能定量捕集废水中银离子，结果令人满意。  相似文献   

Measurements of tropospheric OH concentrations: A comparison of field data with model predictions     

D. Perner  U. Platt  M. Trainer  G. Hübler  J. Drummond  W. Junkermann  J. Rudolph  B. Schubert  A. Volz  D. H. Ehhalt  K. J. Rumpel  G. Helas 《Journal of Atmospheric Chemistry》1987,5(2):185-216

Using long path UV absorption spectroscopy we have measured OH concentrations close to the earth's surface. The OH values observed at two locations in Germany during 1980 through 1983 range from 0.7×10⁶ to 3.2×10⁶ cm^-3. Simultaneously we measured the concentrations of O₃, H₂O, NO, NO₂, CH₄, CO, and the light non methane hydrocarbons. We also determined the photolysis rates of O₃ and NO₂. This allows calculations of OH using a zero dimensional time depdendent model. The modelled OH concentrations significantly exceed the measured values for low NO _x concentrations. It is argued that additional, so far unidentified. HO _x loss reactions must be responsible for that discrepancy.  相似文献