Sensitive thermometric catalytic method for the determination of iron(III) based on its catalytic action on the oxidation of sulphanilic acid by sodium periodate

The Analyst ◽  
1990 ◽  
Vol 115 (6) ◽  
pp. 749-751 ◽  
Author(s):  
R. Forteza ◽  
J. M. Estela ◽  
V. Cerdá
Keyword(s):  
Sodium Periodate ◽  
Catalytic Action ◽  
Catalytic Method ◽  
Sulphanilic Acid

Determination of the iridium micro-concentrations using a kinetic catalytic method

2020 ◽  
Vol 86 (5) ◽  
pp. 5-10
Author(s):  
E. G. Khomutova ◽  
E. A. Levkevich
Keyword(s):  
Lower Limit ◽  
Room Temperature ◽  
Catalytic Effect ◽  
Sodium Periodate ◽  
Water Soluble ◽  
Injection System ◽  
Optimal Conditions ◽  
Catalytic Method ◽  
Water Soluble Porphyrin

The catalytic effect of iridium on the oxidation of water-soluble porphyrin — 5,10,15,20-tetrakis (4-sulfonatophenyl) porphin (TSPP) with sodium periodate is studied for the first time. A method for determination of the iridium micro-content by the catalytic effect of iridium on the oxidation of water-soluble porphyrin 5,10,15,20-tetrakis (4-sulfonatophenyl) porphin with sodium periodate in a flow-injection system is developed. The lower limit of the determined iridium concentrations is 0.2 × 10–5 μg/ml (P = 0.95), which is lower than that for the methods described in the literature. Optimal conditions for determination have been specified: pH 3; concentration of the reagents in the flows of a given hydraulic mixing scheme 0.5 × 10–5 M TSPP and 0.15 M NaIO4; room temperature for the indicator reaction. A linear calibration characteristic was obtained under chosen optimal conditions in the range of iridium concentrations (0.2 – 2.0) × 10 – 5 μg/ml. The effect of the elements accompanying iridium in industrial and natural materials was studied. Molar excesses of platinum and non-ferrous metals do not interfere with iridium determination: 20-fold Rh (III); 15-fold Pt (IV) and Fe (II); and 20-fold molar excess of Ni (II). Correctness of the results is confirmed by spike recovery tests on model iridium-containing solutions. Sr of the results of iridium determination under selected conditions at n = 3, P = 0.95 on model solutions is no more than 0.04. A comparison of the obtained results with literature data showed that the main advantages of the proposed method for iridium determination are room temperature of the reaction, more simple hardware design and lower limit of the iridium determination.

scholarly journals Spectrophotometric Determination of Zidovudine in Pharmaceuticals Based on Charge-Transfer Complexation Involving N-Bromosuccinimide, Metol and Sulphanilic Acid as Reagents

2007 ◽  
Vol 4 (2) ◽  
pp. 173-179 ◽  
Author(s):  
K. Basavaiah ◽  
U. R. Anil Kumar
Keyword(s):  
Limit Of Detection ◽  
Pharmaceutical Preparations ◽  
Reference Method ◽  
Standard Addition ◽  
Molar Absorptivity ◽  
Sulphanilic Acid ◽  
Bulk Drug ◽  
Student’S T ◽  
Charge Transfer Complexation

A simple spectrophotometric method is proposed for the determination of zidovudine(ZDV) in bulk drug and in pharmaceutical preparations. The method is based on the oxidation of ZDV by a known excess of oxidant N-bromosuccinimide (NBS), in buffer medium of pH 1.5, followed by the estimation of unreacted amount of oxidant with metol and sulphanilic acid. The reacted oxidant corresponds to the amount ZDV. The purple-red reaction product absorbs maximally at 530 nm and Beer’s law is obeyed over a range 5 to 75 μg mL-1. The apparent molar absorptivity is calculated to be 5.1×103L mol-1cm-1, and the corresponding Sandell sensitivity value is 0.052 μg cm-2. The limit of detection and quantification are found to be 0.90 and 2.72, respectively. Intra-day and inter-day precision and accuracy of the developed methods were evaluated as per the current ICH guidelines. The method was successfully applied to the assay of ZDV in tablet/capsule preparations and the results were statistically compared with those of the reference method by applying the Student’s t-test and F-test. No interference was observed from the common tablet/capsule excipients. The accuracy of the method was further ascertained by performing recovery studies via standard-addition method.

A chemical catalytic method for determination of silver in human saliva

1973 ◽  
Vol 18 (12) ◽  
pp. 1461-1467 ◽  
Author(s):  
A.A. Alexiev ◽  
P.R. Bontchev ◽  
I. Todorov
Keyword(s):  
Human Saliva ◽  
Catalytic Method
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