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1.
一种新型尾式卟啉吡啶季铵盐对锌离子显色反应的研究   总被引:2,自引:0,他引:2  
本文研究了一种新型尾式卟啉吡啶季铵盐5-「4-(4-吡啶丁氧基)苯基」-10,15,20-三(4-氯苯基)卟啉溴化物与锌的反应条件。PH=10.0,在吡啶存在下于沸水浴中加热15min,其与Zn^2+形成1:1配合物,其最大吸收波长位于428.6nm,在此条件下试剂的最大吸收波长在418.2nm,相差10nm,配合物摩尔吸光系数4.64×10^5L·mol·cm^-1,锌在0-1.2μg/10mL  相似文献   

2.
本文研究了溴化5-[4-(4-吡啶丁氧基)苯基]-10,15,20-三苯基卟啉与Cu2+的显色反应条件,络合物最大吸收波长为414nm,试剂(H4P2+)最大吸收波长为446nm。对比度为32nm,试剂与铜络合比为1∶1,表观摩尔吸光系数为2.5×105L·mol-1·cm-1,铜含量在0.2—1.0μg/10mL内符合比耳定律,可用于痕量铜的测定。  相似文献   

3.
新型卟啉吡啶季铵盐与铜(Ⅱ)显色反应的研究   总被引:2,自引:0,他引:2  
本文研究了在不使用表面活性剂情况下,新型卟啉试剂溴化5-[4-(4-吡啶丁氧基)苯基]-10,15,20-三(4-甲氧基苯基)卟啉与铜(Ⅱ)的显色反应。结果表明,pH=5-7时,铜(Ⅱ)与此卟啉形成了稳定配合物,其表观摩尔吸光系数为2.37×105L·mol-1·cm-1,铜浓度在0-1.2μg/10mL范围内服从比耳定律。配合物组成的摩尔比为Cu∶卟啉吡啶季铵盐=1∶2,本方法应用于环境水样中铜的测定,结果满意  相似文献   

4.
研究了铜与2-羟基-3-羧基-5-磺酸基苯重氮氨基偶氮苯(HCSDAA)的显色反应。在Tri-tonN-101存在下和pH10.4~11.5的缓冲介质中,Cu2+与HCSDAA形成1∶2的红色配合物,其最大吸收波长是530nm,对比度为102nm,表观摩尔吸光系数为1.31×105L·mol-1·cm-1。铜在0~0.24μg/mL范围内服从比尔定律。用于铅锌矿和花生中微量铜的测定,相对误差不大于3.7%,相对标准偏差不大于1.6%(n=6)。  相似文献   

5.
本研究了吐温-80水溶液中硫氰酸铋配合物的吸收光谱,最大吸收波长λmax=335nm,其摩尔吸光系数ε335=2.61×10^4,与PAR、偶氮胂(Ⅲ)与铋(Ⅲ)的配合物的ε610=2.70×10^4相近,性 种新的三元配合物,并用解释在吐温-80水溶液中硫氰酸铋为一种灵敏的显色反应。  相似文献   

6.
新三氮烯类试剂之一,2-羧基-4-溴苯基重氮氨基偶氮苯,在pH11.0的Na_2B_4O_7-NaOH缓冲介质中,有非离子表面活性剂TritonX-100及阴离子表面活性剂SDS的共同存在下,可与Ag(Ⅰ)生成稳定的2∶1红色配合物,红色配合物的λ_(max)=540nm,表观摩尔吸光系数ε_(540)=1.10×10 ̄5L·mol ̄(-1)·cm ̄(-1)。Ag量在0-10μg/25mL符合比尔定律。方法用于工业废水中痕量Ag的测定,结果满意。  相似文献   

7.
铂(Ⅳ)-钼酸盐-乙基罗丹明B离子缔合显色反应研究   总被引:2,自引:0,他引:2  
本文研究了在聚乙烯醇(PVA)存在下用钼酸盐与乙基罗丹明B(ERB)形成离子缔合物,该缔合物的最大吸收位于580nm,摩尔吸光系数为1.12×106L·mol-1·cm-1,服从比耳定律范围0—2.5μg/25mL,缔合物至少稳定1周,考察了50多种共存离子的影响,除生成杂多酸元素和Au(Ⅲ)、Os(Ⅷ)、Pd(Ⅱ)、Ir(Ⅳ)外,大多数元素不干扰。测定铂的条件为:〔HClO4〕=1.2mol/L,〔MoO42-〕=9.1×10-4mol/L,〔ERB〕=3.2×10-5mol/L,0.08%PVA。缔合物的摩尔比为Pt(Ⅳ)∶ERB=1∶2,本法已用于铂矿中铂的测定,结果满意。  相似文献   

8.
研究了铁(Ⅲ)和钼(Ⅵ)与邻苯二酚在pH 6.20 微酸性介质中反应生成的有色配合物与717型强碱性阴离子交换树脂的交换吸附,探讨了树脂相分光光度法同时测定铁(Ⅲ)和钼(Ⅵ)的实验条件。铁(Ⅲ)和钼(Ⅵ)树脂相有色配合物的最大吸收波长分别为520 nm 和400 nm ,表观摩尔吸光系数ε为4.1×104 L/(m ol·cm )和9.0×104 L/(m ol·cm ),符合Beer定律的范围为0~2.2 m g·L- 1和0~1.6 m g·L- 1。此法用于地下水中微量铁和钼的测定,相对标准偏差为3.3 % 和3.2 % 。  相似文献   

9.
锆(Ⅳ)-桑色素-曲拉通显色反应的研究与应用   总被引:3,自引:0,他引:3  
本文提出在曲拉通X-100存在下,以桑色素为显色剂吸光光度法测定痕量锆的新方法。在「H^+」=0.5-2.0moL的HCl介质中形成三元配合物,其最大吸收波长为λmax=430nm,摩尔吸光系数ε430=9.8×10^4L·mol^-1·cm^-1,锆量在0-15μg/25mL范围内遵守比耳定律,该方法简捷、准确,应用于铝合金中痕量锆的测定,共存离子不干扰,测定令人满意。  相似文献   

10.
桂利嗪的荷移分光光度法测定   总被引:2,自引:0,他引:2  
本研究了桂利嗪与7.7,8,8-四氰基对二次甲苯醌(TCNQ)的荷移(CT)反应,确定了荷移反应的最佳条件。结果表明:在丙酮-甲醇介质中,二于室温条件下10min即可形成1:1的络合物,在其最大吸收波长743nm处表观摩尔吸光系数ε=1.58×10^4L·mol^-1·cm^-1,在0~18μg·mL^-1范围内符合比尔定律。方法的相对标准偏差小于3%(n=10)。对形成CT络合物的机理进行了  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 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   

13.
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   

14.
15.
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   

16.
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   

17.
A transient suppression method for piezoelectric ceramic transducer is presented. By adding some special pedestal pulses to the original transmitted signal, the transient effects in the output of the transducer can be just precisely transmission by use of a narrowband transducer. canceled, thereby achieving the broadband The experimental results show that the transient responses of the sinusoid pulses and coded signals are suppressed successfully and the acoustic waveforms radiated into the surrounding water are improved significantly.  相似文献   

18.
We experimentally demonstrate amplitude squeezed soliton utilizing intensity-dependent self-phase modulation in an asymmetric Sagnac interferometer.The system.whose components are connected via ferrule connector/physical connection(FC/PC)fiber connectors,constitutes all-fiber configuration to generate squeezed soliton.Soliton amplitude reduction measured by homodyne detection is near 4.0 dB below the shot-noise level.Optimal squeezing fields in both simple and compact all-fiber configuration are obtained.  相似文献   

19.
The(2 1)-dimensional nonlinear Schr(o)dinger(NLS)equation with spatially inhomogeneous nonlinearities is investigated,which describes propagation of light in(2 1)-dimensional nonlinear optical media with inhomogeneous nonlinearities.New types of optical modes and nonlinear effects in optical media are presented numerically.The results reveal that the regular split of beam can be obtained in (2 1)-dimensional nonlinear optical media with inhomogeneous nonlinearities,by adjusting the guiding parameter.Furthermore,the stability of beam regular split is discussed numerically,and the results reveal that the beam regular split is stable to the finite initial perturbations.  相似文献   

20.
In the real-world application of face recognition system, owing to the difficulties of collecting samples or storage space of systems, only one sample image per person is stored in the system, which is so-called one sample per person problem. Moreover, pose and illumination have impact on recognition performance. We propose a novel pose and illumination robust algorithm for face recognition with a single training image per person to solve the above limitations. Experimental results show that the proposed algorithm is an efficient and practical approach for face recognition.  相似文献   

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