盐酸肼还原次甲基蓝催化光度法测定痕量钼（VI）

基于在盐酸介质中，钼对次甲基兰与盐酸肼氧化还原反应的催化活性，建立了测定痕量钼新的动力学方法。其检出限为２．６２×１０＾１０ｇ／ｍＬ，线性范围０￣１．０μｇ／２５ｍＬ，可用于豆类、茶叶中钼中的测定。     

盐酸肼还原次甲基蓝催化光度法测定痕量钼(Ⅵ)

基于在盐酸介质中，钼对次甲基兰与盐酸肼氧化还原反应的催化活性，建立了测定痕量钼新的动力学方法。其检出限为２６２×１０－１０ｇ／ｍＬ，线性范围０～１０μｇ／２５ｍＬ，可用于豆类、茶叶中钼中的测定。     

动力学光度法测定微量铑的研究

研究了在六次甲工砗胺介质和硫代硫酸钠存在的条件下,微量铑阻抑荧光素与Ｆｅ＾２＋和Ｔｗｅｅｎ－８０褪色反应的新指示反应及其测定条件。     

高碘酸钾-灿烂绿体系阻抑动力学光度法测定痕量铜

在pH=4.0醋酸-醋酸钠缓冲介质中,铜(Ⅱ)能阻抑高碘酸钾氧化灿烂绿的褪色反应,据此建立了阻抑动力学光度法测定铜(Ⅱ)的新方法.在最佳测定条件下,铜(Ⅱ)在0.05～2.0μg/mL范围内与催化反应速率呈良好的线性关系,检出限为0.008 9μg/mL.重复8次测定0.5μg/mL的铜(Ⅱ),相对标准偏差为2.1%....     

溴酸钾－甲基百里酚蓝催化光度法测定钢中微量钒

研究了在0.5mol/L磷酸介质中及酒石酸存在下,钒（Ⅴ）对溴酸钾氧化四基百里酚蓝褪色反应的催化作用,据此建立了一种测定钒的方法,在23℃时,钒量在0.01-0.1μg/mL范围内与△A呈级性关系,检出限为0.01μg/mL。在NaF存在下,常见离子无干扰。     

甲基橙催化褪色光度法测定阿莫西林

在硫酸介质中,阿莫西林可以催化溴酸钾氧化甲基橙使其褪色,且褪色程度（△A）与阿莫西林浓度在一定范围内符合朗伯-比尔定律,据此建立了催化光度法测定阿莫西林的新方法。在最优试验条件下,阿莫西林含量在0.70～9.0μg/mL范围内与吸光度呈良好的线性关系,检出限0.33μg/mL,回收率在96%～104%之间。可用于胶囊中阿莫西林含量的测定,结果满意。     

用高碘酸钾-乙基紫催化光度法测定痕量钒(Ⅴ)

研究了在邻苯二甲酸-氢氧化钠缓冲体系中,利用钒( )催化高碘酸钾氧化乙基紫的褪色反应,建立了催化光度法测定痕量钒( )的新方法。方法的线性范围为0.2～1.6μg·L-1,检出限为0.2μg·L-1,钒( )的测定RSD为1.86%。Mn2+,Cu2+,Fe2+,Fe3+,Cr3+,Pb2+在50倍,K+,Na+,Ca2+,Mg2+,Cl-,Br-等在100倍以上无明显干扰。可以直接用于各种水源中痕量钒( )的测定。     

钌(Ⅲ)-高碘酸钾-灿烂绿体系催化光度法测定痕量钌的研究

基于硫酸介质中钌(Ⅲ)对高碘酸钾氧化灿烂绿(BG)的催化反应,建立了动力学光度法测定痕量钌的新方法.钌在5.0×10-10～1.0×10-7g/mL范围内与催化反应速率有良好的线性关系,相关系数为0.994 1,方法的检出限为1.9×10-10g/mL.大部分常见离子不干扰测定.该体系灵敏度高、稳定性好,直接用于水样中...     

微量锰的测定

研究了在HAC-NaAC介质中,在表面活性剂NP-7存在下,痕量猛(Ⅱ)催化高碘酸钾氧化偶氮胂(Ⅲ)的褪色反应,建立了测定痕量猛的新方法.本法检出限为8.9×10-6g/L,锰的线性范围为0.12~0.68μg/mL,用本法对化工生产中钴、锰催化剂残留量的分析结果与原子吸收光谱法一致.测得的最大相对误差为3.83%,最大相对标准偏差为3.66%.回收率在95.5 %~105.0%之间.     

分光光度法测定血清中的总蛋白含量

在 p H=2 .36的 Britton- Robinson缓冲介质中 ,紫色的水溶苯胺蓝与蛋白质形成蓝紫色的结合物 ,其最大吸收波长 λmax为 688nm,比水溶苯胺蓝试剂本身红移 88nm,表观摩尔吸光系数达4.2 5× 1 0 5L/( mol· cm) (与牛血清白蛋白结合 )。制定了 4种蛋白质的标准曲线 ,用于人血清样品中总蛋白的测定 ,结果与溴甲酚绿法一致     

A New Reaction for Kinetic Spetrophotometric Determination of Trace Ruthenium——Catalytic Oxidation of Methyl Green by Bromate

A sensitive catalytic spectrophotometric method for the determination of ruthenium （Ⅲ） has been developed, based on its catalytic effect on the oxidation reaction of methyl green with potassium bromate in acid solution medium at 100℃. The above reaction is followed spectrophotometrically by measuring the decrease in the absorbance at 625 nm for the catalytic reaction of methyl green. The calibration curve for the recommended reaction-rate method was linear in the concentration range over 0.00-0.80 μg/L and the detection limit of the method for Ru （III） is 0.006 μg/L. Almost no foreign ions interfered in the determination at less than 25-fold concentration of Ru （Ⅲ）. The method is highly sensitive, more selective and very stable, and has been successfully applied for the determination of trace ruthenium in some ores and metallurgy products.     

Kinetic Spectrophotometric Determination of Trace Titanium(Ⅳ) Based on Oxidation Discoloration of Acid Chrome Blue K with Hydrogen Peroxide

A simple and sensitive kinetic spectrophotometric method for the determination of trace amounts of titanium(IV), based upon the catalytic effect of Ti(IV) on the oxidation of acid chrome blue K (ACBK) by hydrogen peroxide in 0.002 mol/L sulfuric acid, is described. The reaction rate is monitored spectrophotometrically by measuring the decrease in absorbance of ACBK at 524 nm. The detection limit of the method is 1.01×10-9 g/mL, and the linear range is 0-0.048 mg/L. The influence of acidity, concentration of reactants, reaction time, reaction temperature and for-eign ions is also discussed. The optimum reaction conditions were established and some kinetic parameters determined. The apparent activation energy of the catalytic reaction is 5.32 kJ/mol. The relative standard deviation for the determi-nation of titanium(IV) at the concentration of 0.048 mg/L is calculated to be 1.31% (n = 11). In combination with sol-vent extraction separation, the method has been successfully applied to the determination of trace titanium(IV) in human hair, plant matter, tea and rock samples. The results are in good agreement with the certified values with the relative standard deviations (RSD) of 1.4%-3.5%.     

Kinetic Spectrophotometric Determination of Trace Titanium（IV） Based on Oxidation Discoloration of Acid Chrome Blue K with Hydrogen Peroxide

A simple and sensitive kinetic spectrophotometric method for the determination of trace amounts of titanium（IV）, based upon the catalytic effect of Ti（IV） on the oxidation of acid chrome blue K （ACBK） by hydrogen peroxide in 0.002 mol/L sulfuric acid, is described. The reaction rate is monitored spectrophotometrically by measuring the decrease in absorbance of ACBK at 524 nm. The detection limit of the method is 1.01×10^-9 g/mL, and the linear range is 0-0.048 mg/L The influence of acidity, concentration of reactants, reaction time, reaction temperature and foreign ions is also discussed. The optimum reaction conditions were established and some kinetic parameters determined. The apparent activation energy of the catalytic reaction is 5.32 kJ/mol. The relative standard deviation for the determination of titanium（IV） at the concentration of 0.048 mg/L is calculated to be 1.31% （n = 11）. In combination with solvent extraction separation, the method has been successfully applied to the determination of trace titanium（IV） in human hair, plant matter, tea and rock samples. The results are in good agreement with the certified values with the relative standard deviations （RSD） of 1.4%-3.5%.     

催化动力学光度法测定痕量Cu(Ⅱ)

在Ｖ（Ⅴ）－Ｍｎ（Ⅱ）——二安替比林基（对二甲氨基）苯基甲烷（ＤＡＤＭ）显色体系中，Ｃｕ（Ⅱ）具有阻化作用。Ｃｕ（Ⅱ）量在２．０～７．０μｇ／２５ｍＬ范围内具有良好的线性关系，由此建立了测定痕量Ｃｕ（Ⅱ）的催化动力学光度法．     

用钨酸钠和耐尔蓝光度法测定痕量锡

聚乙烯醇存在下锡与钨酸钠和耐尔蓝反应形成离子缔合物，它的最大吸收位于５８０ｎｍ，表观摩尔吸光度ε值２．９５×１０７Ｌ·ｍｏｌ－１·ｃｍ－１，服从比耳定律范围０～２．０μｇ／Ｌ．测定极限（３σ）０．０８３μｇ／Ｌ（ｎ＝１０）．对２．０μｇ／Ｌ锡测定的ＲＳＤ为１．４２％（ｎ＝１１），离子缔合物至少稳定７２ｈ．考察了４０多种共存离子影响，大多数常见离子不干扰。本法已用于某些合金钢和锌合金中钠克量锡的测定。结果与推荐值吻合，回收率满意。     

催化光度法测定生活饮用水中痕量铜

本文利用了Cu(Ⅱ)在H_2SO_4介质中催化H_2O_2氧化甲基橙使之褪色,在波长505nm处测定吸光度的变化,建立了催化动力学光度法测定痕量铜的新方法。方法的线性范围为0～2.0μg/25ml,定量检测限为1.27×10~(-10)g/ml。该方法的灵敏度高.准确度好,在用于测定饮用自来水中痕量铜时,结果满意。     

催化光度法测定水中痕量亚硝酸根

基于亚硝酸根对溴酸钾氧化结晶紫褪色反应的催化作用,提出了一种在室温下测定痕量亚硝酸根的催化光度法．测定亚硝酸根的线性范围为0～2．0μg／10ml,检出限为3．4ng／ml,本法简便快速,具有较高的灵敏度和选择性．用于不同水样中痕量亚硝酸根的直接测定,结果令人满意．     

褪色光度法测定透明质酸钠研究

在近中性介质中,基于甲基紫与透明质酸钠发生缔合作用使甲基紫溶液褪色,建立了甲基紫分光光度测定透明质酸钠的新方法,确定了测定的最佳条件。实验结果表明,透明质酸钠质量浓度在25-175μg／10mL范围内服从比尔定律,其回归方程为A=0．0036ρ（μg／10mL）＋0．0229,相关系数γ=0．9950。所拟方法用于滴眼液中透明质酸钠的测定,结果满意,加标回收率在98．82％～102．5％。