双波长分光光度法同时测定灌木饲料中的铁和铝

利用铁、铝与邻苯二酚紫（PCV）形成的络合物的最大吸收波长相差30nm的光谱性质，建立了同时测定铁和铝的双波长分光光度法，并对络合物的形成条件及相互干扰情况进行研究，方法用于灌木饲料样品中铁和铝测定。     

Dual-wavelength spectrophotometric determination of cadmium with cadion

Cadmium has been determined by dual-wavelength spectrophotometry with cadion, p-nitrobenzenediazoaminobenzene-p-azobenzene, and a non-ionic surfactant, Triton X-100. Cadion and its cadmium chelate are dissolved in a micellar solution of the surfactant. The absorbance difference at the wavelength of maximum absorption of the cadmium chelate (477 nm) and that of cadion (566 nm) is measured. A combination of triethanolamine, iminodiacetate and citrate is very effective for masking other ions. Cadmium in zinc metal can be determined without prior separation.     

Studies on the Dual-wavelength Spectrophotometric Determination of Trace Copper with 5-(5-nitro-2-pyridylazo)-2,4-diamino-toluene

A new dual-wavelength spectrophotometry has been developed for the determination of copper(I) with 5-(nitro-2-pyridylazo)-2,4-diamino-toluene.     

光度分析

本文是《分析试验室》定期评述中“光度分析”的第五篇文章，评述了１９９２．７－１９９４．６期间我国光度分析的概况，内容包括：学术会议，专著，综述，有机试剂，二元显色体系，多元配合物光度分析，动力学光度法，萃取光度法，浮选和离心光度法，双波长分光江度法，导数光度法，流动注射－分光光度法，计量学分光光度法，其他光度法，包括这两年我国学者在国际杂志上发表的有关光度分目录。引用文献１０５２篇。     

Flow injection techniques for flame atomic absorption spectrophotometry

When analysing real samples by flame atomic absorption spectrophotometry, considerable sample pretreatment together with the selection of the correct calibration strategy is necessary to ensure accurate results. Flow injection techniques can be used (a) to improve existing procedures, (b) as the basis for new calibration methods, and (c) to extend the capabilities of conventional flame atomic absorption spectrophotometry.     

双波长分光光度法测定有机弱酸弱碱的解离常数

本文提出了一种测定有机一元弱酸弱碱解离常数的新方法———双波长分光光度法。该方法是在选定的一对工作波长下测定相同浓度不同pH值的有机一元弱酸弱碱水溶液的吸光度,利用所推导的公式作图求得pKa(或pKb)。利用本方法测定了甲基橙、溴甲酚绿、苯酚和苯胺等多种常见的有机一元弱酸弱碱的解离常数,结果十分满意。与传统的单波长分光光度法相比,双波长法测定结果的精密度和准确度更高。     

紫尿酸双波长叠加光度法测定水中微量铁

在碱性介质中,铁（Ⅱ）与紫尿酸发生显色反应形成一种蓝色配阴离子,该配阴离子具有两个吸收峰,分别位于630nm和350nm,吸光度A630,A350之和△A与铁（Ⅱ）的含量在0-2μg／mL范围内线性关系良好,据此建立了测定微量铁的紫尿酸双波长叠加光度法,该法用于水中微量铁的测定,测定结果与火焰原子吸收法（FAAS）相吻合,加标回收率为98％-102％,测定结果的相对标准偏差为1．2％-2．9％（n=5）。     

An improved method of isomolar series by dual-wavelength spectrophotometry

An improved method of isomolar series for determining the composition of an aqueous binary spectrophotometric system is proposed. It is based on the determination by dual-wavelength spectrophotometry of the equilibrium concentration of the chromogenic agent L added in excess, the absorbance of which has been found to be a linear function ofn/m, the composition index of the reaction product M _m L _n in the system, Hence it is a direct and reliable method, applicable also to systems in which the absorption spectra of L and M _m L _n overlap and can be resolved by instrumental masking.     

Spectrophotometric Methods for the Simultaneous Determination of Metals in University Laboratories

Spectrophotometry is an analytical technique that is studied at the university level because of its ease of operation and low expense. Three different experimental methods of gradual difficulty are proposed for the application of this technique to the simultaneous determination of two metals. The techniques are applicable to the practice of all subdisciplines of experimental chemistry. These techniques are (1) absorption spectrophotometry, the determination of cobalt (II) and copper (II); (2) first-derivative spectrophotometry, the determination of chromium (III) and copper (II); and (3) first-derivative spectrophotometry using the zero-crossing method, the determination of copper (II) and mercury (II).     

稀土元素分析

本文对１９９６年￣１９９７年间稀土材料分析方面的进展进行了综述。内容包括概述，分离与富集方法，重量与滴定分析法，吸光光度法，荧光分析法，原子发现光谱法，原子吸收光谱法，Ｘ射线荧光光谱法，质谱分析法，电化学分析法，活化分析法，流动注射分析法等。     

Cloud point extraction of aluminum (III) in water samples and determination by electrothermal atomic absorption spectrometry,flame atomic absorption spectrometry and UV-visible spectrophotometry

Cloud point extraction was applied as a preconcentration step for the determination of trace level of Al(III) in water samples with electrothermal atomic absorption spectrometry (ETAAS), flame atomic absorption spectrometry (FAAS) and UV-visible spectrophotometry. The aluminum was extracted as aluminum-Eriochrome Cyanine R (ECR) complex, at pH 6 by micelles of the non-ionic surfactant octylphenoxypolyethoxyethanol (Triton X-114). The investigations showed that the same CPE procedure can be used for different detection techniques. The results obtained from these techniques were evaluated. Under the optimal conditions, limit of detection obtained with ETAAS, FAAS and UV-visible spectrophotometry were 0.03 ng mL^?1, 0.06 µg mL^?1 and 0.01 µg mL^?1, respectively. The accuracy of the procedure was tested by analysing certified reference material. The method was successfully applied to determination of aluminum in water samples and dialysis fluid.     

Dual-wavelength spectrophotometric determination of copper in sea-water with alpha,beta,gamma, degrees -tetrakis(1-methylpyridinium-4-yl) porphine

Copper has been determined by dual-wavelength spectrophotometry with alpha,beta,gamma, degrees -tetrakis(1-methylpyridinium-4-yl) porphine (TMPyP). The difference in absorbance at the Soret band of the copper complex (423 nm) and that of TMPyP (446 nm) was measured. Copper in a coastal sea-water sample was preconcentrated with a Chelex-100 separation in which l-cysteine was used as eluent. This combination could determine copper at the ng/ml and sub-ng/ml level.     

meso—四（4—磺基苯基）卟啉双波长分光光度法测定阳离子表面活性剂

在酸性条件下，阳离子表面活性剂使ｍｅｓｏ－四（４－磺基苯基）卟啉（ＴＰＰＳ４）发生Ｊ－型聚合，在４９０ｎｍ处出现Ｊ－型聚集吸收并导致位于４３４ｎｍ的Ｓｏｒｅｔ吸收带降低。阴离子表面活性剂如十二烷基硫酸钠（ＳＤＳ）使聚集更一步增强，据此建立起水中痕量阳离子表面活性剂的双波长分光光度测定，方法成功地应用于合成和实际水样分析。     

Recent development in derivative ultraviolet/visible absorption spectrophotometry: 2004-2008: A review

Several techniques have been proposed for treatment of spectrophotometric data, with the objective of extracting a largest amount of analytical information from spectra composed of unresolved bands. Undoubtedly, a major success was achieved by derivative treatment of the absorbance curves-plotting of the first or a higher order mathematical derivative of absorbance against wavelength (dA/dλ). Derivative spectrophotometry has been applied to many chemical systems, such as pharmaceuticals, foods, cosmetics, and environmental samples.The instrumental development and analytical applications of derivative UV-vis regions absorption spectrophotometry produced in the last 5 years (since 2004) are reviewed.     

硒的化学形态分析

对硒的化学形态分析的现状(1991-2006)进行了评述,主要涉及的分析方法有紫外-可见分光光度法、荧光光度法、氢化物发生(HG)原子荧光光谱法、HG原子吸收光谱法、电感耦合等离子体(ICP)原子发射光谱、气相色译原子吸收光谱联用、ICP-质谱与多种分析技术联用等(引用文献45篇).     

负吸光度法用于褪色动力学光度法测定的研究

以碱性品红褪色动力学光度法测定ＳＯ３＾２－为例,研究了负吸光度法用于褪色动力学光度法测定的优点与原因。结果表明,相对正吸光度法,灵敏度提高４０％,标准偏差下降８３．４％,线性范围上限提高了２倍,下限从０．１μｇ扩展到０,其原因是提高了测定吸光度的信噪比,有色剂用量能选在灵敏度最高、稳定性最好的最佳浓度,操作简便,规范减小了误差。