共查询到18条相似文献,搜索用时 46 毫秒
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用磷光寿命变化测定碘离子与磷光体反应动力学参数 总被引:2,自引:2,他引:0
利用I^-促进系间窜越,加快发现过程,缩短磷光寿命的特点,研究I^-量改变与色氨酸,色胺磷光寿命关系,分别为:τ=3.98e^-0.0658x,与τ=3.5e^-0.0899x,应用静态分析,推导Stern-Volmer式,计算平衡常数Ks与ki,分别为:0.109与0.200mmol;0.027与0.051smmol^-1。利用本法分析了酷氨酸,苯丙氨酸,L-色氨酸,牛血清白蛋白,葡糖苷酸酶。 相似文献
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用燐光寿命变化分析血中游离色氨酸 总被引:2,自引:0,他引:2
全血用三氯醋酸(TCA)去蛋白的上清液中加入不同量色氨酸(x),测燐光寿命(τ).以加入色氨酸与燐光寿命变化回归方程与应用推导的公式。x_0=τ_i-bx_i)/b,计算血中游离色氨酸(x。)为 11.1μg/mL.与文献报道的一致. 相似文献
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催化动力学光度法测定痕量碘 总被引:2,自引:0,他引:2
涂建平 《理化检验(化学分册)》2001,37(11):495-496
基于碘在高碘酸钾氧化亮绿SF增色反应中的催化活性 ,建立了高灵敏度、高选择性的催化动力学光度法测定痕量碘的方法 ,测定范围为 0 .5~ 10 μg·ml- 1,方法检出限为 0 .2 6μg·ml- 1,用于天然水的碘化物测定 ,获得满意结果 相似文献
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水溶液中S_2O_8~(2-)氧化I~-的反应是典型的二级离子反应,常选为大学物理化学实验.但该实验一直沿用滴定法和碘钟法,因而存在着操作繁锁费时、无法确定任意时刻的反应物浓度及引入其它试剂使体系复杂等缺点. 为了克服上述缺点,本文根据离子选择电极和化学动力学原理,提出一种新的能系统地进行S_2O_8~(2-)与I~-反应动力学实验的方法,它包括反应级数、反应速度常数、反应活化能的测定以及考察离子强度、催化剂对反应速度的影响.作者采用碘离子选择电极(以下简称碘电极)电位法跟踪反应中I~-浓度的变化,可由 相似文献
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Based on catalysis of I- on the decolor reaction between potassium bromate and indigo carmine in the acid medium,and combined with flow injection analysis,a new flow-injection catalytic kinetic spectrophotometric method was found for determination of iodide in sample.The experimental results show that the determination is carried out at temperature of 80℃ and the concentration of H_2SO_4,KBrO_3,and indigo carmine is 1.2 mol/L,1.8×10~(-2) mol/L and 1.0×10~(-4) mol/L respectively,the linear range for the method is 0.50~1.8 mg/L.The detection limit is 0.0022 mg/L.The relative standard deviation is 1.92%.The proposed method was applied to the determination of iodide in troche successfully.The recovery was between 99.2% and 103.6%. 相似文献
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阻抑动力学分光光度法测定微量碘 总被引:1,自引:0,他引:1
基于在稀磷酸介质中,痕量碘离子对亚硝酸根催化溴酸钾氧化甲基红的的阻抑作用,提出了测定痕量碘离子的阻抑动力学分光光度分析的方法.测定碘离子的线性范围在0.66 mg·L-1以内,检出限(3Sb/K)为7.5×10-6g·L-1.用于海带及食盐中微量碘的测定,测定结果的相对标准偏差(n=6)在1.4%~2.2%之间,测得方法的回收率为99.7%~100.1%. 相似文献
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严小平 《广东微量元素科学》2007,14(10):46-49
研究了在稀硫酸介质中,痕量碘离子对亚硝酸根催化溴酸钾氧化甲酚红的阻抑作用,建立了测定痕量碘离子的阻抑动力学光度分析的新方法。测定碘离子的线性范围为0~0.62μg/mL,检出限为7.43×10-9 g/mL。已用于食品中痕量碘的测定,结果满意。 相似文献
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测定可逆反应动力学参数的一种新方法 总被引:2,自引:1,他引:1
提出了测定一级可逆反应速率常数的新方法,用以测定稀土的偶氮胂Ⅲ络合物与CyDTA交换反应的速率常数,并详细讨论了测定速率常数时动力学数据的选取原则。 相似文献
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对氯苯甲酸铕与邻菲咯啉络合物热分解动力学参数及寿命的测定 总被引:6,自引:0,他引:6
用TG-DTG技术研究了对氯苯甲酸铕与邻菲咯啉络合物在静态空气中的热分解,用Coats-Redfern(CR)法、Horowitz-Metzger(HM)法、Madhusudanan-Krishnan-NInan(MKN)法、Ozawa法和Kissinger法计算了对氯苯甲酸铕与邻菲咯啉络合物第一步热分解反应的动力学参数活化能(E)、指前因子(A)、反应级数(n)等。用等温TG法得到失重10%的E、A值和寿命方程:lnτ=-23.0189 17974.1/T。 相似文献
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Reaction heat induced laser beam deflection is a new analytical method which came in tobeing in 1993', by probing the gradient of the refraction index which was induced byreaction heat with a laser probe beam, one can relate the laser beam deflection to theconcentration of the sample.In this paper, the method was used for the study of the kinetic process for ureaurease system. It is well known that urease catalyzes the hydrolysis of urea as follows fUreaseNHZCONHZ HZO~ CO2 2NH3 QThe pro… 相似文献
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Y.-Q. Zhang X.-C. Zeng Y. Chen X.-G. Meng A.-M. Tian 《Journal of Thermal Analysis and Calorimetry》1999,58(2):463-475
On the basis of the theory of thermokinetics proposed in the literature, a novel thermokinetic method for determination of the reaction rate, the characteristic parameter method, is proposed in this paper. Mathematical models were established to determine the kinetic parameters and rate constants. In order to test the validity of this method, the saponifications of ethyl benzoate, ethyl acetate and ethyl propionate, and the formation of hexamethylenetetramine were studied with this method. The rate constants calculated with this method are in agreement with those in the literature, and the characteristic parameter method is therefore believed to be correct.In the light of the characteristic parameter method, we have developed further two thermo-kinetic methods, the thermoanalytical single and multi-curve methods, which are convenient for simultaneous determination of the reaction order and the rate constant. The reaction orders and rate constants of the saponifications of ethyl acetate and ethyl butyrate and the ring-opening reaction of epichlorohydrin with hydrobromic acid were determined with these methods, and their validity was verified by the experimental results.This revised version was published online in November 2005 with corrections to the Cover Date. 相似文献