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1.
对乙酰基偶氮氯膦与镧显色反应的研究及应用   总被引:3,自引:0,他引:3  
研究了对乙酰基偶氮氯膦与镧的显色反应 ,在 0 .2 mol/L 盐酸介质中 ,有乙醇及吐温 - 80存在时 ,生成3∶ 1紫色络合物。 λmax=6 75 nm,ε=7.33× 1 0 4 L· mol- 1· cm- 1。采用双波长法 ,以 5 30 nm为参比波长 ,6 75 nm为测定波长 ,ε=9.2 0× 1 0 4 L· mol- 1· cm- 1 ,镧含量在 0— 37.5 μg/2 5 m L范围内符合比耳定律。本法用于电子工业钛酸镧烧结中游离氧化镧的测定 ,结果令人满意。  相似文献   

2.
微波消化-分光光度法测定铂   总被引:5,自引:0,他引:5  
在盐酸介质中对氨基苯基亚甲基若丹宁 (ABR)与铂的显色反应 ,生成 2∶ 1稳定络合物 ,λmax=5 2 5 nm,ε=5 .98× 10 4L·mol-1·cm-1。铂含量在 0— 5 0 μg/ 2 5 m L范围内符合比耳定律 ,方法可用于催化剂中铂含量的测定。  相似文献   

3.
在 p H=5 .2 HAc- NH4Ac的缓冲介质中 ,α,α′-联喹啉 ( α,α′- BQ)与 Fe( )生成红色 3∶ 1络合物 ,λmax=5 1 5 nm,ε=2 .0 0× 1 0 4 L· mol- 1· cm- 1 ,Fe( )含量在 0— 30 μg/2 5 m L内符合比耳定律 ,本方法用于工业己内酰胺中铁含量的测定 ,结果令人满意。  相似文献   

4.
4-(2-吡啶偶氮)-间苯二酚光度法测定煤灰中钒   总被引:4,自引:2,他引:2  
在 0 .6 mol· L-1的硫酸介质中 ,钒 - PAR-羟胺生成红色络合物 ,最大吸收波长为 5 5 0 nm,摩尔吸光系数ε=1.91× 10 4L· mol-1· cm-1,钒含量在 0— 80μg/ 2 5 m L范围内符合比耳定律。本方法灵敏、简便 ,用于测定煤灰中的钒 ,结果满意  相似文献   

5.
山奈黄素光度法测定烟草样品中的铝   总被引:3,自引:0,他引:3  
本文研究了山奈黄素与铝的显色反应 ,在 p H=5 .6 HAc- Na Ac缓冲介质中 ,有 CPB存在下 ,山奈黄素与铝反应生成 3∶ 1稳定络合物 ,λmax=42 5 nm,ε=1 .6 3× 1 0 4 L· mol- 1 · cm- 1 。铝含量在 0— 2 0μg/2 5 m L内符合比耳定律 ,方法用于烟草样品中铝含量的测定 ,结果令人满意。  相似文献   

6.
三溴偶氮胂褪色光度法测定土壤及化学试剂中铬(VI)   总被引:1,自引:0,他引:1  
在 0 .4 8mol/L硝酸介质中 ,Cr( )与三溴偶氮胂 (TBA)发生褪色反应 ,该反应的表观摩尔吸光系数ε516nm=1.0 4× 10 5L· mol-1· cm-1,铬 ( )含量在 0— 1.0× 10 -4 g/L范围内呈良好线性关系。该法用于土样及化学试剂中 Cr( )的测定 ,结果令人满意。  相似文献   

7.
分光光度法测定环境水样中的汞   总被引:5,自引:0,他引:5  
阮琼 《光谱实验室》2003,20(3):396-398
研究了氯磺酚偶氮硫代若丹宁 ( HSCT)与汞的显色反应 ,在醋酸介质中 ,HSCT与汞反应生成 2∶ 1稳定络合物 ,λmax=5 4 5 nm,ε=5 .66× 10 4 L· mol-1· cm-1。汞含量在 0— 2 .5μg/ m L范围内符合比耳定律 ,本方法可用于水样中痕量汞含量的测定  相似文献   

8.
在 p H5 .5的 HAc- Na Ac缓冲介质中 ,在乳化剂 OP存在下 ,Cu( )与 4 ,5 -二溴邻硝基苯基荧光酮生成 1∶ 2络合物 ,λmax=5 90 nm ,ε590 =9.5× 10 4 L· mol- 1 · cm- 1 ,铜浓度在 0— 0 .4 8mg/ L范围内遵从比耳定律 ,本方法用于粮食及水中铜的测定 ,结果令人满意  相似文献   

9.
2-(2-喹啉偶氮)-1,5-苯二酚分光光度法测定烟草样品中的钙   总被引:1,自引:0,他引:1  
司云森 《光谱实验室》2004,21(2):290-292
在 p H为 8.0的柠檬酸钠 -氢氧化钠缓冲介质中 ,Triton X- 10 0存在下 ,2 - (2喹啉偶氮 ) - 1,5苯二酚(QADHB)与钙反应生成 1∶ 1稳定配合物 ,λmax=5 5 5 nm,ε=4 .18× 10 4L· mol-1· cm-1。钙含量在 0 .1—2 5μg/ 2 5 m L的范围内符合比耳定律 ,方法用于烟草中钙含量的测定 ,结果令人满意。  相似文献   

10.
氯磺酚偶氮硫代若丹宁光度法测定铂   总被引:6,自引:0,他引:6  
本文研究了氯磺酚偶氮硫代若丹宁 (HSCT)与铂的显色反应 ,在盐酸介质中 ,HSCT与铂反应生成 2∶ 1稳定络合物 ,λmax=5 3 5 nm,ε=6.2 4× 1 0 4 L· mol-1· cm-1。铂含量在 0— 5 0 μg/2 5 m L范围内符合比耳定律 ,方法用于催化剂中铂含量的测定  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.
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   

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.
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   

15.
16.
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.  相似文献   

17.
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   

18.
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.  相似文献   

19.
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.  相似文献   

20.
Gray cross correlation matching technique is adopted to extract candidate matches with gray cross correla- tion coefficients less than some certain range of maximal correlation coefficient called multi-peak candidate matches. Multi-peak candidates are extracted corresponding to three closest feature points at first. The corresponding multi-peak candidate matches are used to construct the model polygon. Correspondence is determined based on the local geometric relations between the three feature points and the multi-peak candidates. The disparity test and the global consistency checkout are applied to eliminate the remaining ambiguous matches that are not removed by the local geometric relational test. Experimental results show that the proposed algorithm is feasible and accurate.  相似文献   

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