摘要:

In this study two new spectrophotometric methods were used for the simultaneous determination of analgine and paracetamol in their binary mixture. In the first method, derivative spectrophotometry, dA/dλ values were measured at 249.2 nm and 264.8 nm for analgine and paracetamol respectively, in the first derivative spectra of their mixtures. The relative standard deviation of the method was found to be 0.35% for analgine and 0.31% for paracetamol. In the second, absorbancy ratio method, the quantification of analgine and paracetamol was performed by using the absorbances read at 256.8 nm, 235.5 nm and 264.6 nm in the zero-order spectra of their mixture; relative standard deviations of the method were found to be 0.49% and 1.26% for analgine and paracetamol respectively. These two methods have been successfully applied to a tablet containing these drugs.

ISSN:0003-2719    

DOI:10.1080/00032719708004049

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

In a 0.4mol.L−1HOAc-NaOAc buffer solution, the catalytic hydrogen waves of the rhodium(III)-2-(3,5-dibromo-2-pyridylazo)-5-diethylaminophenol (3,5-Br2-PADAP) complexes were obtained by single-sweep polarography. The composition of the adsorptive complex was determined as Rh(III):3,5-Br2-PADAP = 1:2 by polarography. The electroanalytic properties of 3,5-Br2-PADAP are also discussed. The proposed oscillopolarographic method can be used for determining trace rhodium in the range of 4.8 × 10−10∼ 2.4×10−6mol.L−1without interference from other noble metal ions. The detection limit was 7.7×10−11mol.L−1.

ISSN:0003-2719    

DOI:10.1080/00032719708004050

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

The stripping potentiometric determination of lead, cadmium and copper with mercury film glassy-carbon electrodes coated with a Nafion membrane was investigated. The mercury film was plated using either mercury(II) acetate encapsulated within the Nafion membrane or a mercury(II) solution. Dissolved dioxygen was used as the stripping agent. The electrodes showed promising properties, particularly robustness and response repeatability. A linear dependence of the stripping time on concentration was found in the μg l−1concentration range (s.d. of intercept ≤ 0.3 μg l−1, r.s.d. of slope ≤ 1%, for both lead and cadmium).

ISSN:0003-2719    

DOI:10.1080/00032719708004051

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

A simple and reliable procedure simultaneously to determine seven trace and/or ultratrace toxic metals in a single sample of environmental plants has been presented. The procedure is based on the simultaneous determination of Cu, Pb and Cd by differential pulse anodic stripping voltammetry, of Zn and Mn by differential pulse voltammetry and of Ni and Co by differential pulse adsorption voltammetry at the hanging mercury drop electrode. The details of sampling, washing and drying of samples and the approach of digestion and preparation of samples for voltammetric determination have been investigated. The method has been applied to determination of the seven metals in grass and hucerne from different environments.

ISSN:0003-2719    

DOI:10.1080/00032719708004052

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

ISSN:0003-2719    

DOI:10.1080/00032719708004038

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor