新显色剂四(邻氯对磺酸基苯基)卟啉导数分光光度法同时测定镉和铅的研究

在pH 10.7,有溴化十六烷基二甲基乙酸铵存在,咪唑催化新显色剂四(邻氯对磺酸基苯基)卟啉与镉和铅反应生成三元胶束络合物,最大吸收波长分别为437和470nm,其表观摩尔吸光系数相应为5.6×10~5和2.0×10~5。用二阶导数分光光度法同时测定镉和铅,结果满意。     

超高灵敏显色剂meso-四(4-氯苯基)卟啉与钴反应的分光光度法研究

本文研究了新显色剂meso-四(4-氯苯基)卟啉与钴的反应条件。在表面活性剂存在下,90℃恒温加热15min,试剂与钴形成稳定的1:1配合物。λ_(max)=420nm,ε_(420)=7.94×10~5L·mol~(-1)·cm~(-1),0～3.2μgCo/25ml符合比尔定律,为目前已报道的分光光度法测定钴最灵敏的方法。用来测定维生素B_(12)针剂中微量钴,结果满意。     

四(4-三甲铵苯基)卟啉荧光熄灭法测定痕量镉(Ⅱ)

利用TPPS₄催化动力学荧光测定痕量镉(Ⅱ)已有报道^[1],而利用四(4-三甲铵苯基)卟啉(TAPP)的荧光熄灭测定痕量镉(Ⅱ)的工作尚未见报道.本文研究了室温下Cd(Ⅱ)-TAPP反应体系的荧光光谱特性,发现Cd(Ⅱ)-TAPP的形成使TAPP的荧光发生静态熄灭.利用咪唑(Imid)、十二烷基硫酸钠(SDS)和乙醇增敏、增稳,最低可检测3×10^-4ppmCd(Ⅱ),灵敏度高于其它方法^[2].测定了胶印锌片和人发中的镉,结果与标准值或方法对照值吻合.     

四(4-氯苯基)卟啉分光光度法测定微量铅(Ⅱ)

研究了四(4-氯苯基)卟啉与微量铅(Ⅱ)的显色反应,探讨了显色剂、硼砂-氢氧化钠,表面活性剂Tween-80等的用量以及反应时间对配合物的生成以及稳定性的影响.结果表明,在pH＝10的硼砂氢氧化钠缓冲溶液及Tween-80微乳液中,铅(Ⅱ)与四(4-氯苯基)卟啉形成1∶1的稳定配合物.配合物的最大吸收位于466 nm波长处,表观摩尔吸光系数ε＝2.5×105L·mol-1·cm-1,铅(Ⅱ)浓度在160 μg·L-1范围内符合比耳定律.方法用于环境水样中铅的测定,获得较好的结果.     

三阶导数分光光度法同时测定铜,钴与镉

采用三阶导数光谱技术，以ｍｅｓｏ－四（４－三甲铵基苯基）卟啉作显色剂分光光度法同时测定了微量的铜、钴与镉。方法中以铅离子掩蔽过剩试剂的吸收峰，然后进行三级微分求导，可以使铜、钴、镉吸收峰完全分开，于４１５ｎｍ、４３４ｎｍ及４３８ｎｍ处同时测定３元素含量，由三阶导数光谱的吸光值可求算出配合物的三阶导数摩尔吸光系数分别为：１．１１×１０６、３．９５×１０５及６．４７×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。     

meso-四(3-氯-4-磺酸苯基)卟啉与钴(Ⅱ)显色反应的光度法研究

研究了弱碱性介质中新试剂meso-四(3-氯-4磺酸苯基)卟啉(m-ClTPPS4)与钴(Ⅱ)的显色反应条件.不加任何辅助试剂,沸水浴中加热,m-ClTPPS4与Co(Ⅱ)形成检测灵敏度很高的1:1(M:L)配合物,其最大吸收波长为426 nm,表观摩尔吸光系数达4.0×105L@mo1-1@cm-1.钴(Ⅱ)含量在0～5.0μg/25 mL范围内符合比耳定律.该方法应用于维生素B12中钴(Ⅱ)的测定,结果满意.     

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。     

TTP-钴构型的测定和meso-四(3,4-次甲二氧基苯基)卟啉的合成及其与镉的显色反应

本文对TTP-钴的构型进行了测定,证明其中位的4个苯环与卟啉环不在同一平面上,二者已不能发生共轭效应,所以取代基对卟啉环的影响较小,用改变取代基来提高试剂的灵敏度效果必然不大,本文合成了新型卟啉——meso-四(3,4-次甲二氧基苯基)卟啉(简称TMDOPP),并对其与镉显色反应分光光度法进行了研究,结果表明,此法灵敏度高(ε=4.9×     

Simultaneous Determination of Adrenaline and Noradrenaline by First Derivative Spectrophotometry in a Fia Assembly

Abstract

This article deals with the design of an unsegmented-flow injection manifold for the simultaneous determination of adrenaline and noradrenaline two structurally related compounds with overlapping spectra. An FIA manifold is proposed for the simultaneous determination in which the sample solution is directly injected into a carrier-reagent stream of aqueous NaOH. The selected wavelengths (first derivative) were 394 and 342 nm, for noradrenaline and adrenaline, respectively with an integration time of 0.4 s. The calibration graphs are linear over the range 2.0–30 ppm for both drugs. The method is applied to different synthetic mixtures of both drugs.     

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 Lanthanum and Europium by Higher Order Derivative Molecular Absorption Spectrophotometry

Abstract

The identical properties of rare earth elements towards reaction with various chromogenic reagents in molecular absorption spectrophotometry (MAS) leads to a requirement for the development of procedures with greater selectivity. One way of solving this problem is by utilizing derivative spectroscopy, where the composite spectrum is transformed to the second or higher order derivative in wavelength domain. This paper reports the utilization of higher order derivative spectrophotometry for the simultaneous determination of lanthanum and europium. The developed procedure is simple, reliable and allows the determination of as low as 100 and 10 ppb of lanthanum and europium. respectively. Similar methodology can be adopted for the simultaneous determination of two or more of any closely related analytes by proper choice of derivative order in addition to selecting a suitable chromogenic reagent, pH and masking agents.     

一阶导数分光光度法同时测定记忆合金电镀液和电镀层中铁和钯

在酸性介质中,铁和钯分别与亚硝基Ｒ盐络合形成绿色的Ｆｅ－ＮＲＳ和红色的Ｐｄ０ＮＲＳ,利用一阶导数分光光度法在水相中同时测定Ｆｅ和Ｐｄ。结果证明,两种络合物的摩尔吸光系数分别为１．９４×１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾０１（对铁）和１．６３×１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾１（对钯）;线性范围分别为０－５．６ｍｇ／ｌ（对铁）和０－７．０ｍｇ／Ｌ（对钯）;相对标准偏差均小于２．０％;回收率为９６５－１     

Simultaneous Determination of Sunset Yellow and Ponceau 4R in Gelatin Powder by Derivative Spectrophotometry and Partial Least-Squares Multivariate Spectrophotometric Calibration

ABSTRACT

Two methods for the simultaneous determination of Sunset Yellow and Ponceau 4R in gelatin powders by first derivative spectrophotometry and by partial least-squares multivariate spectrophotometric calibration are described. These procedures do not require any separation step. These methods were applied to determine both colorants in commercial gelatin powders and the results obtained were compared. A good statistical agreement was obtained between the results.     

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.     

示波极谱同时测定金属锌中铅和镉

本文提出了在ＨＣｌ－Ｈ＿３ＰＯ＿４－ＫＣｌ底液中示波极谱同时测定金属锌中铅、镉含量的方法，检测下限铅为０．１ｍｇ／Ｌ，镉为０．０１ｍｇ／Ｌ铅、锡波形清晰，重视性好。试样中加标准回收，铅回收率为９９．２％～１００％，镉回收率为９５％～９８％，与标准方法比较，相对误差＜５％。方法准确、简便、快速，适用于金属锌中铅、镉的常规分析。