卡尔曼滤波分光光度法同时测定钢榈的硅,磷,砷

研究了在聚乙烯醇存在下，硅、磷、砷杂多酸与罗丹明６Ｇ形成离子缔合物的反应，建立了能同时测定硅、磷、砷的卡尔曼滤波分光光度法。用于钢样中微量硅、磷、砷的同时测定，操作简便快速，相对误差小于８％。     

二阶导数紫外分光光度法测定面粉中的过氧化苯甲酰

用铁粉与盐酸反应产生的原子态氢将面粉中的过氧化苯甲酰还原成苯甲酸,用乙醚提取,采用二阶导数紫外分光光度法测定其含量,过氧化苯甲酰的检出限是1．0μg/mL,回收率为94％～106％,其测量精密度优于国家标准GB／T5009—1996色谱法,与校正曲线法相当。     

Kalman滤波分光光度法用于同时测定废水中的钍及镧

近年来运用Kalman滤波(KF)分光光度法进行多组分同时测定,把干扰信息视作噪声,对相互叠加的光谱曲线作快速滤波,适用于多方程组联合运算,并可提高准确度[1～4]。本文以我室新合成的二溴羧基偶氮胂(3-[(4,6-二溴-2-羧基苯)偶氮]-6-[(2-胂酸基苯)偶氮]-4,5-二羟基-2,7-萘二磺酸)为显色剂,用KF分光光度法对工业废水实样中的钍(Ⅳ)及镧(Ⅲ)作     

分光光度法测定水溶液中的有机酸含量

利用水溶液中的有机酸在高氯酸羟胺(HAP)和N,N′-二环己基碳酰亚胺(DCC)存在的条件下生成的羟肟酸,以及羟肟酸在酸性高氯酸铁溶液中显色的性质,建立了一种分光光度测定水中有机酸含量的方法。对显色剂的酸度、浓度、加入体积、HAP和DCC的浓度、加入体积以及显色反应的温度、反应时间对吸光度的影响进行了考察。结果表明,该显色反应在反应条件:0.0687mol/LHAP1.0mL、0.6mol/LDCC0.5mL、震荡均匀后室温下放置反应15min、0.02mol/L酸性高氯酸铁溶液(高氯酸浓度0.3mol/L)显色条件下具有最大的吸光度;并对正丁酸、正戊酸、苯甲酸进行了线性关系考察。结果表明,该检测方法具有仪器简单、操作方便、线性范围较宽、准确度高等优点,可用于那些不易从水溶液中萃取的有机酸的测定,也可用于液相色谱洗脱液中有机酸的测定。     

红外分光光度法测定地下水中的石油类物质

采用红外分光光度法测定地下水中石油类物质。用四氯化碳萃取水中的石油类物质,将萃取物用硅酸镁吸附,脱除极性物质后进行测定。方法的检出限为0.014 mg/L,测定结果的相对标准偏差为0.65%~1.18%(n=l1)。用该方法对地下水样品进行测定并进行加标准回收试验,结果表明,地下水样品的加标回收率为84.0%~93.2%。该方法灵敏度高,操作简便、快速,可以满足地下水中石油类分析的要求。     

蔬菜叶片中叶绿素a和叶绿素b的阶导数分光光度法测定

本文提出用一阶导数分光光度法同时测定蔬菜叶片中叶绿素ａ和叶绿素ｂ的含量。讨论了同时存在于蔬菜叶片中的类胡萝卜素对两者测定的影响，并提出用适当浓度的类胡萝卜素丙酮溶液作为参比溶液，用以消除类胡萝卜素对叶绿素测定的影响。     

蔬菜叶片中叶绿素a和叶绿素b的一阶导数分光光度法测定

本文提出用一阶异数分光光度法同时测定蔬菜叶片中叶绿素ａ和叶绿素ｂ的含量。讨论了同时存在于蔬菜叶片中的类胡萝卜素对两者测定的影响，并提出用适当浓度的类胡萝卜素丙酮溶液作为参比溶液，用以消除类胡萝卜素对叶绿素测定的影响。     

Quantitative Determination of Miconazole in Creams by Second Order Derivative Spectrophotometry

ABSTRACT

A derivative spectrophotometry was developed to determine miconazole in cream formulations that contain benzoic acid as preservative. The procedure was based on the linear relationship in the range 100-500 μg ml^?1 between the drug concentration and the second derivative amplitudes at 276 nm. Results of the recovery experiments performed on various amounts of benzoic acid and of the determination of miconazole in cream confirmed the applicability of the proposed method to complex formulations.     

Simultaneous 2nd Order Derivative Spectrophotometry Determination of Sorbic and Benzoic Acids in Soft Drinks

Abstract

A method is developed for the simultaneous 2nd order spectrophotometric determination of 1 to 7 μg.mL^?1 of each of benzoic and sorbic acids in non vegetal soft drinks, using a blank prepared from the same soft drink to be analyzed in order to avoid the interferece from other additives and colouring matter present.     

Simultaneous Determination of Cobalt and Nickel Using Morpholinedithiocarbamate (MDTC) as Reagent by First and Second Derivative Spectrophotometry

A selective and sensitive derivative method has been proposed for the simultaneous determination of trace amounts of Co(II) and Ni(II) with morpholinedithiocarbamate (MDTC) in the presence of sodium lauryl sulphate (SLS). The molar absorption coefficients of the 1:2 complex of Co(II) and Ni(II) at 326 nm and 322 nm are 2.248 × 10⁴ and 2.505 × 10⁴ L mol^?1 cm^?1 for zero order. The analytical sensitivity for the second derivative of Co(II) and Ni(II) complexes are 0.0044 μg mL^?1 and 0.0060 μg mL^?1. The developed derivative procedure, using the zero‐crossing technique, has been successfully applied for the analysis of Co(II) and Ni(II) simultaneously in different alloy samples.     

Simultaneous Determination of Procaine Penicillin G and Benzathine Penicillin G by Second Derivative Spectrophotometry

Abstract

A new method for determining the binary mixtures of procaine penicillin G and benzathine penicillin G using “zero-crossing” second derivative spectrophotometry is described. Calibration graphs were linear up to 8.80 10^?5 M for procaine penicillin G and 4.40 10^?5 M for benzathine penicillin G. The method was realized in ethanol/water medium (30 % v/v). A complete and exhaustive statistical analysis of the experimental data was realized to demonstrate the validity of method. The method was applied for determining procaine penicillin G and benzathine penicillin G synthetic mixtures with good results. The procedure does not require any separation step.     

导数光谱多组分标定法对阿司匹林、扑热息痛及水杨酸的同时测定

采用导数光谱多组分标定法,根据中心合成设计建立标定集和预测集,将PLS和PCR应用于阿司匹林、扑热息痛及水杨酸混合物的零阶和一阶导数光谱,从而实现了混合物中各组分的同时测定.实验结果表明,阿司匹林、扑热息痛及水杨酸的吸收光谱严重重叠;由于各组分零交叉点重合,零交叉点比光谱-导数分光光度法无法同时测量混合物中各组分的含量...     

Simultaneous Determination of Perphenazine and Amitriptyline by Derivative Spectrophotometry

Abstract

Two methods have been developed for the simultaneous determination of Amitryptiline and Perphenazine: the zero-crossing (I) and the derivative ratio spectrum (II) methods and both use the derivative spectrophotometry.

The methods have been applicable in the ranges of 1 to 30 μg·ml^?1 of Amitryptiline (I and II) and between 1 and 8 μg·ml^?1 and from 1 to 7 μg·ml^?1 of Perphenazine for the methods I and II respectively. The accuracy of the proposed methods have been studied and they have been used in the determination of Amitryptiline and Perphenazine in commercially available pharmaceuticals.     

以四(对羟基苯基)卟啉作显色剂组合导数分光光度法同时测定锌、镉的研究

本文利用“组合导数分光光度法”,在碱性介质中,以四(对-羟基苯基)卟啉作显色剂,以咪唑作催化剂,对锌、镉的同时测定进行了详细研究。该法使测定锌的表观摩尔吸光系数提高到10~6L·mol~(-1)·cm~(-1),同时解决了重叠谱带相互干扰的问题。对合成样品进行分析,结果令人满意。     

多波长线性回归导数分光光度法同时测定饮料中糖精钠和苯甲酸

测定了同时测定两组分的多波多线性回归导数分光光度法,无需进行化学分离。方法用于模拟样品和饮料样品中糖精钠和苯甲酸的同时测定,回收率为９８％￣１０１％,相对标准偏差〈３．０％。