ICP-AES测定蒙成药阿嘎日-17中的微量元素

硝酸加盐酸消解样品,用电感耦合等离子体-原子发射光谱法(ICP-AES)在选定的最佳条件下,对传统蒙药阿嘎日-17中Mn、Fe、Ca,Al、Mg、Zn、Ba、Sr等8种微量元素进行了同时测定,该方法采用一次溶样,多元素同时测定,回收率为93.4%-106.4%,RSD小于3.1%.测定灌木枝叶标准物质GBW070602,结果与标准值基本一致.该方法简便、快速、准确.适用于蒙药样品的测定,结果令人满意.     

ICP-OES同时测定水性油墨中8种可溶性重金属元素

建立了全谱直读电感耦合等离子体光谱(ICP-OES)测定5种不同颜色水性油墨中As、Ba、Cd、Cr、Hg、Pb、Sb、Se 8种可溶性重金属元素的分析方法,研究了元素分析谱线选择、背景校正扣除、样品基体及待测元素间干扰等因素.结果表明,基体元素对测定没有明显干扰;在选定的波长下测定,元素间也没有干扰.该方法快速,准确可靠,各元素检出限0.0018-0.026μg/mL,加标回收率为92.6%-101.8%,相对标准偏差RSD均小于2.0%,适于水性油墨中8种可溶性重金属的日常检验.     

ICP-MS测定碳酸锂中微量元素

用ICP-MS测定碳酸锂中微量杂质元素的基本条件,确定了合适的样品处理、分解方法,研究了元素间的干扰.方法检出限K0.020μg/g,Na o.025μg/g,Ca0.009μg/g,Mg 0.010μg/g,SO2-4 0.050μg/g;加标回收率在94.0%-102.0%,测定精密度RSD 0.5%-2.1%,方...     

微波消解-电感耦合等离子体-质谱测定蔬菜中的铅和镉

用微波消解-电感耦合等离子体-质谱测定蔬菜中的Pb和Cd,方法简便、快速.Pb和Cd检出限分别为0.14μg/L和0.13μg/L,相对标准偏差(RSD,n=5)＜4.69%,标准加入法回收率Pb为96.0%-104.0%,Cd为95.0%-110.0%.方法经国家一级植物标准物质验证,结果与推荐值相符.     

微波消解-氢化物原子荧光光谱法测定食品中的微量元素硒

采用HNO3-HClO4作为消解剂,在微波消解炉中消解样品,原子荧光光谱法测定食品中的微量元素硒.在最佳测定条件下测定元素硒的线性回归方程为:IF=95.4853C 9.2045,线性范围为0.5-10.0μg/L,相关系数r=0.9997.回收率2.0μg/L为95.65%-103.04%,6.0μg/L为95.61%-102.42%;相对标准偏差2.0μg/L为2.18%-3.55%,6.0μg/L为2.22%-3.98%.食品样品采用微波消解后,可用氢化物原子荧光光谱法测定其中的微量元素硒.     

生态纺织品中有害金属元素的ICP-AES分析

以模拟酸性汗液萃取样品,以ICP-AES同时测定纺织品中Pb、As、Cu、Cr、Cd、Co、Ni和Sb8种元素的含量.结果表明,本文采用的方法检出限在0.004-0.044mg/L之间,回收率为96.1%-102.8%,相对标准偏差为0.65%-3.25%,能简便、快速、准确的测定纺织品中的多种重金属残留量.     

ICP-AES测定钕铁硼永磁合金中主量元素

采用ICP-AES同时测定了钕铁硼永磁合金中的Nd、Fe、Co、B、Zr5种主量元素.选择了合适的分析线和样品测定浓度,确定了各元素的检出限为0.54-1.94μg/L,加标回收率为90.5%-119%.方法准确,快速、简便,用于生产实践中,结果令人满意.     

电感耦合等离子体-原子发射光谱法测定铝合金中7种元素含量

采用基体匹配技术,相同牌号的铝合金标准样品绘制校准曲线,用氢氧化钠、过氧化氢和硝酸溶解铝合金试样,电感耦合等离子体-原子发射光谱法直接测定铝合金中Cu、Fe、Mg、Mn、Si、Ti、Zn 7种元素含量.方法简便、快速.回收率95.7%-102.4%,相对标准偏差0.45%-1.21%.     

微波消解ICP-MS测定尿样中硒及其他重金属元素

建立微波消解电感耦合等离子体-质谱法(ICP-MS)同时测定尿样中硒及铬、镉、砷、铅、锰、钴、镍、铜、锌10种重金属元素的方法。采用硝酸-过氧化氢消解体系,微波消解法制备样品.以铟、铋为内标物质,直接用ICP-MS测定上述10种元素。所测10种元素的检出限为0.006-0.073μg/L,校准曲线线性关系好(r>0.9999),相对标准偏差(RSD)均小于3%,对尿样标准物质的测定值均在标准参考值范围内。应用微波消解ICP-MS分析尿样,方便快捷,灵敏度高,检出限低,重现性好,是理想的生物样本检删分析方法。     

湿法分解-活性炭富集-化学光谱法测定化探样中的金、铂和钯

试验了用王水溶矿,尿素还原除去NO-2的影响,活性炭吸附Au、Pt、Pd的条件.在10% HCl介质中[AuCl4]-、[PtCl6]2-、[PdCl4]2-被定量吸附,与其他元素分离,经发射光谱法测定.Au、Pt、Pd的回收率为92%-110%,经国家一级标准物质验证,其测定值与标准值相吻合,方法检出限分别为Au 0.2ng/g、Pt 0.5ng/g、Pd 0.3ng/g、精密度为RSD%=7.6-12.8.     

Guided-Wave Two-Dimensional Acousto-Optic Scanner Using Proton-Exchanged Lithium Niobate Waveguide

Two-dimensional scanning of a 0.6328 mum guided-light beam has been realized using noncolinear acousto-optic (AO) coplanar Bragg diffraction together with colinear AO guided-mode to substrate radiation-mode conversion in a Z-cut Xpropagation LiNbO3 proton-exchanged (PE) waveguide. The two surface acoustic (SAW) waves utilized are at the center frequencies of 500 and 200 MHz, propagating in the Y and X axes, respectively. Two-dimensional scanning of approximately 720 resolvable light beam spots, namely, 18 40 (horizontal vertical) scanning, has been demonstrated using a light beam of 1.0 mm aperture. The total number of resolvable beam spots can be greatly increased from 720 by simply utilizing SAW transducers of larger bandwidth and a light beam of greater aperture. It should also be possible to significantly increase the diffraction efficiency from 3 % by optimizing the parameters of the PE waveguide and the SAWs.     

Hybrid Wavelength and Code Division Multiple Access in Optical Networks

A review of schemes for multiple access in fiber optic networks shows that a hybrid of wavelength and code division multiple access (WCDMA) combines the best features of both. In particular, the hybrid scheme retains the large information carrying capacity of wavelength division multiple access (WDMA) and flexibility of code division multiple access (CDMA). In this paper WDMA, optical CDMA (OCDMA), and WCDMA networks are discussed. In OCDMA networks, concept of incoherent and coherent coding including inverse decoding and matched filter is introduced. The delay performance of both WDMA and WCDMA networks, under the simple suboptimum access protocols based on cyclic search, is computed. It has been shown quantitatively that tuning delay significantly affects the delay performance of both WDMA and WCDMA networks. Futhermore, delay performance of WCDMA networks is always better than the WDMA networks for the same tuning delay, load, and number of users.     

Effect ofγ-radiation on the spectral luminescence characteristics of impure cadmium tungstate crystals

Results of a study of the effect of γ-radiation on the spectral luminescence properties of cadmium tungstate crystals doped with silver, bismuth, and molybdenum cations are presented. Spectral characteristics of the nondnnnoped crystals are briefly described. Absorption and photo and X-ray luminescence spectra of the crystals taken before and after exposure to γ-radiation (5.5·10⁴ Gy) are compared. It is found that the spectral characteristics of the crystals doped with silver, bismuth, and molybdenum cations do not change markedly after the exposure. The relation between the type of impurity-induced defects, individual characteristics of the impurity cations, and the character of the effect of γ-radiation on the spectral luminescence properties of impure crystals is analyzed (preliminarily). Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 1, pp. 55–60, January–February, 1997.     

Femtosecond Transform-Limited Pulse Generation by Compensating for the Linear Chirp of SPM Spectra in Dispersion Shifted Fibers

A simple technique of pulse compression, based on the linear chirp compensation of self-phase modulation (SPM) spectra in dispersion shifted fibers, is demonstrated. The optimization procedure is carried out, for a short span of a single-mode fiber, using a parabolic law, which describes the behavior of the squared output pulse width versus the pump peak power in the case of Gaussian pulses. The experimental results give a minimum pulse duration of 233 fs, which is in good agreement with the model. Shorter and coherent pulses, down to 90 fs, have been obtained by inserting an interference filter at the optical output.     

Sorting of bending magnets for the SSRF booster

The Shanghai Synchrotron Radiation Facility(SSRF)booster ring,a full energy injector for the storage ring,is deigned to accelerate the electron beam energy from 150MeV to 3.5GeV that demands high extraction efficiency at the extraction energy with low beam loss rate when electrons are ramping.Closed orbit distortion(COD)caused by bending magnet field uniformity errors which affects the machine performance harmfully could be effectively reduced by bending magnet location sorting.Considering the affections of random errors in measurement,both ideal sorting and realistic sorting are studied based on measured bending magnet field uniformity errors and one reasonable combination of bending magnets which can reduce the horizontal COD by a factor of 5is given as the final installation sequence of the booster bending magnets in this paper.     

Measurement of nonlinear coefficient of optical fiber based on small chirped soliton transmission

We measure the waveform and phase curves of short optical pulses before and after transmission over different lengths of fibers by use of the pulse analyzer with the frequency-resolved optical gating (FROG),and numerically simulate pulse evolution under the experimental conditions.The nonlinear coefficient of the fiber is given by comparing the experimental results with the numerical ones.Difference between the experiment and numerical simulation is analyzed.     

Resonance scattering of canonical elastic shells in absorbing fluid medium

Resonance scattering of elastic spherical shell and cylindrical shell while the surrounding fluid medium has absorption is studied. The normal mode solution derived using exact elastic theory and the separation of variables is still applicable. However, the scattering form function has to be modified for the absorbing medium, otherwise the unreasonable result would be obtained. The backscattering form function in the absorbing medium is redefined, and the form function of elastic spherical and cylindrical shell with vacuum or solid matter filled is calculated in various absorption conditions. The results show that the absorption of surrounding fluid leads to notable attenuation of the coincidence resonances in the mid-frequency, but it has a little influence on the low-frequency resonance scattering induced by the filler inside the shell.     

Single-beam self-referenced phase-sensitive surface plasmon resonance sensor with high detection resolution

A versatile and low-cost single-beam self-referenced phase-sensitive surface plasmon resonance(SPR)sensing system with ultra-high resolution performance is presented.The system exhibits a root-mean-square phase fluctuation of ±0.0028.over a period of 45 min.i.e.a resolution of±5.2×10-9 refractive index units.The enhanced performance has been achieved through the incorporation of three design elements:a true single-beam configuration enabling complete self-referencing so that only the phase change associated with SPR gets detected,a differential measurement scheme to eliminate spurious signals not related to the sensor response,and the elimination of retardation drifts by incorporating temperature stabilization in the liquid crystal phase modulato .Our design should bring the detection sensitivity of non-labeling SPR biosensing closer to that achievable by conventional fluorescence-based techniques.     

Influences of SiO2 protective layers and annealing on the laser-induced damage threshold of Ta2O5 films

Ta2O5 films are prepared on BK7 substrates with conventional electron beam evaporation deposition.The effects of SiO2 protective layers and annealing on the laser-induced damage threshold (LIDT) of the films are investigated.The results show that SiO2 protective layers exert little influence on the electric field intensity(EFI)distribution,microstructure and microdefect density but increase the absorption slightly.Annealing iS effective on decreasing the microdefect density and the absorption of the films.Both SiO2 protective layers and annealing are beneficial to the damage resistance of the films and the latter is more effective to improve the LIDT.Moreover,the maximal LIDT of Ta2O5 films is achieved by the combination of SiO2 protective layers and annealing.