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1.
动力学荧光法测定痕量钒的研究   总被引:5,自引:2,他引:3  
基于磷酸介质中,钒(Ⅴ)对溴钾氧化吖啶黄具有催化使用,使体系荧光猝灭,建立了动力学荧光法测定痕量钒的新方法。方法的线性范围为0.02-0.2μg.L^-1和0.2-2.0μg.L^-1,检出限为0.006μg.L^-1。将方法用于水样中钒含量的测定,结果满意,本实验还对反应机理进行了初步探讨。  相似文献   

2.
环丙沙星在胶束体系中的荧光特性研究及应用   总被引:9,自引:1,他引:8  
研究了环丙沙星在胶束体系中的荧光性质,发现十二烷基硫基酸对环丙沙星有较强的增敏作用。据此建立了胶束增敏荧光光谱法测定痕量环丙沙星的新方法,经样品测定,其线性范围为0.033-0.60μg.mL^-1,检出限为0.033μg.mL^-1,回收率为94.0%-98.1%相对标准偏差为1.5%-2.8%。  相似文献   

3.
研究了用火焰原子吸收光谱法在同一溶液体系中直接快速测定金川铜镍矿浮选产品中铜、镍、镁含量新的新方法。考察了产品中高含量的SiO2对测定镁的干扰情况,并提出了排除这项干扰简便方法,根据各元素的标准溶液系列的测定数据,推算出了铜、镍、镁3元素的线性回归方程及线性相关系数,特征浓度铜为0.40mg.L^-1/1%,镍为0.48mg.L^-1/1%,Mg为0.018mg.L^-1/1%;线性浓度范围铜,镍均为0-10mg.L^-1,镁为0.2-1.2mg.L^-1。相对标准偏差铜为2.5%(n=6),镍为2.3%(n=6),镁为2.8%(n=6),加标回收率铜为96.5%-102.5%,镍为98.8%-103.5%,镁为98.2%-102.5%,这种方法操作简便,快速,实用,具有较好的精密度和准确度,实际产品分析结果与外检单位及金川公司测定的结果吻合。  相似文献   

4.
提出承1mol.L^-1 NH4SCN介质中用MIBK萃取,4mol./L^-1HNO3反萃取火焰原子吸收光谱(FAAS)测定微量钴的新方法,试验表明,4mol.L^-1 HNO3是钴的良好反萃取剂,钴浓度在0-5mg.L^-1范围内有良好的线性关系,检测限可达0.070mg.L^-1,测定树脂固化促进剂中微量钴,加标回收率在96.2%-104.6%。  相似文献   

5.
ICP-AES法测定水中微量磷   总被引:16,自引:1,他引:15  
贺惠  张萍 《光谱实验室》2002,19(2):244-246
用ICP-AES法测定水中磷,并确定了最佳测定条件,检出限为0.02μg.mL^-1,回收率为96.5%-102.1%,RSD为1.65%-2.83%。该法准确、快速、简便,应用于水中磷的测定,结果令人满意。  相似文献   

6.
原子荧光光谱法同时测定化妆品中砷和汞   总被引:5,自引:0,他引:5  
研究了原子荧光光度法同时测定化妆品中的砷和汞,并试验了硼氢化钠浓度、共存离子的影响,优化了仪器条件。方法回收率分别在:As88.7%-101.0%、Hg97.0%-107.2%之间,砷和汞的检出限分别为0.026μg/L和0.020μg/L;线性范围为As0.5—100μg/L、Hg0.5—70μg/L;RSD(n=6)As1.4%、Hg2.5%。方法具有操作简便、快速、灵敏度高等优点,可用于化妆品中As、Hg的测定。  相似文献   

7.
微波消解ICP-AES法同时测定花岗石中铜、镉、铬和砷   总被引:9,自引:3,他引:6  
张萍 《光谱实验室》2002,19(3):338-340
本文采用微波消解和ICP-AES法,同时测定花岗石样品的铅、镉、铬、砷4有害元素,检出限分别为0.0008、0.0007、0.0018、0.0012μg.mL^-1,回收率为93.4%-102.5%,RSD为1.3%-3.6%,该法准确、快速、简便,结果令人满意。  相似文献   

8.
火焰原子吸收光谱法测定氢甲酰化反应液中铁   总被引:2,自引:0,他引:2  
利用冰醋酸作溶剂,采用火焰原子吸收光谱法直接测定氢甲酰化反应液中的总铁含量,以1mol/L盐酸萃取样品,有机相与无机相分虽用冰醛酸稀释后用火焰原子吸收法测定,可分虽得到样品中有机铁与无机铁的含量,方法简便、快速、可靠。具有较好的精密度和准确度,回收率为93.5%-109%,相对标准偏差为1.0%-2.7%,方法的特征浓度为0.585μg/mL/1%.  相似文献   

9.
ICP-AES测定饮用水源中的Cu、Mn、Pb、Cd、Zn   总被引:7,自引:2,他引:5  
用ICP-AES法同时测定饮用水源中的Cu、Mn、Pb、Cd、Zn等重金属元素,具有基体效应小、测量范围宽等优点。检出限为0.2-4.0μg/L,回收率为91.5%-103.9%,相对标准偏差为0.29%-1.5%,测定密码样与实际样品,结果令人满意。  相似文献   

10.
微波消解-GFAAS法测定蘑菇中的痕量铅   总被引:14,自引:1,他引:13  
采用微波制样技术,石墨炉原子吸收法测定蘑菇中痕量铅,结果表明,方法的线性范围为0-100μg,检出限为2.6μg,相对标准偏差为3.0%,回收率为98%,该法准确,快速、简便,与常压酸消解法比较,结果基本一致,已用于蘑菇中痕量铅的测定。  相似文献   

11.
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.  相似文献   

12.
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.  相似文献   

13.
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.  相似文献   

14.
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.  相似文献   

15.
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.  相似文献   

16.
17.
A multi-conjugate adaptive optics (MCAO) can offer a possibility of widening field of view (FOV) characterized by the isoplanatic angle, and the choose of conjugate height becomes a basic problem for MCAO, which influences the size of iosplanatic angle. Considering the application of lidar, the isoplanatic angle's expressions of two deformable mirrors (DMs) MCAO for uplink and downlink are deduced. The effects of conjugate heights for dual-conjugate AO are thoughtfully discussed, and the isoplanatic angles are further analyzed. The results show that the isopanatic angle varies with the conjugate height and reaches the maximum as the conjugate height is at the optimal altitude. Moreover, the optimal conjugate height changes with the propagation distance.  相似文献   

18.
Due to the limit of response speed of the present single-photon detector, the code rate is still too low to come into practical use for the present quantum key distribution (QKD) system.A new idea is put up to design a quick single-photon detector.This quick single-photon detector is composed of a multi-port optic-fiber splitter and many avalanche photo diodes (APDs).Au of the ports with APDs work on the time division and cooperate with a logic discriminating and deciding unit driven by the clock signal.The operation frequency lies on the number N of ports, and can reach N times of the conventional single-photon detector.The single-photon prompt detection can come true for high repetition-rate pulses.The applying of this detector will largely raise the code rate of the QKD, and boost the commercial use.  相似文献   

19.
20.
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.  相似文献   

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