scholarly journals A New Spectrophotometric Method for the Determination of Micro Amounts of Thiocyanate by Solvent Extraction

1967 ◽  
Vol 40 (3) ◽  
pp. 569-575 ◽  
Author(s):  
Tomozo Koh ◽  
Iwaji Iwasaki
Keyword(s):  
Solvent Extraction ◽  
Spectrophotometric Method

scholarly journals A rapid spectrophotometric method for the determination of mercury in environmental, biological, soil and plant samples using diphenylthiocarbazone

2003 ◽  
Vol 17 (1) ◽  
pp. 45-52 ◽  
Author(s):  
M. Jamaluddin Ahmed ◽  
Md. Shah Alam
Keyword(s):  
Solvent Extraction ◽  
Human Blood ◽  
Spectrophotometric Method ◽  
Absorption Maximum ◽  
Stoichiometric Composition ◽  
Reagent Concentration ◽  
Environmental Waters ◽  
Plant Samples ◽  
Foreign Species

A simple, sensitive and highly selective direct spectrophotometric method for the determination of trace levels of mercury(II) in various samples is described. Diphenylthiocarbazone (dithizone) reacts in slightly acidic 50% aqueous 1,4-dioxane media (0.18–1.80 M sulphuric acid) with mercury(II) to give an orange chelate which has an absorption maximum at 488 nm. The average molar absorption co-efficient and Sandell's sensitivity were found to be 2.5×104l mol−1 cm−1and 0.015 μg of Hg(II) cm−2, respectively. The reaction is immediate and absorbance remains stable for over 24 h. Beer's law is obeyed for concentration range of mercury(II) between 0.1 μg ml−1and 25 μg ml−1; the stoichiometric composition of the chelate is 1 :2 (mercury : dithizone). The various analytical parameters, such as effect of time, acidity, reagent concentration and foreign species, were studied. The method was applied successfully to a number of environmental waters (portable and polluted), biological samples (human blood, urine and fish), soils, plant samples (potato, cabbage, lettuce, carrot and tomato), solutions containing both mercury(I) and mercury(II) and complex synthetic mixtures. The method is very simple and requires no solvent extraction or pre-concentration steps.

scholarly journals Determination of traces of copper in cement by solvent extraction and spectrophotometric method

1966 ◽  
Vol 15 (8) ◽  
pp. 825-829 ◽  
Author(s):  
Hajime ISHII ◽  
Hisahiko EINAGA ◽  
Eiichi AOKI
Keyword(s):  
Solvent Extraction ◽  
Spectrophotometric Method

scholarly journals Spectrophotometric Determination of Some Non-Sedating Antihistamines Using Erythrosine B

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Michael E. El-Kommos ◽  
Samia M. El-Gizawy ◽  
Noha N. Atia ◽  
Noha M. Hosny
Keyword(s):  
Solvent Extraction ◽  
Complex Formation ◽  
Spectrophotometric Method ◽  
Dosage Forms ◽  
Ion Pair ◽  
Pharmaceutical Dosage Forms ◽  
Erythrosine B ◽  
Ich Guidelines ◽  
Sensitive Spectrophotometric Method

A simple and sensitive spectrophotometric method has been developed for the determination of cetirizine (I), ebastine (II), fexofenadine (III), ketotifen (IV), and loratadine (V) based on ion-pair complex formation with erythrosine B. The pink color of the produced complex was measured at 550 nm without solvent extraction. Appropriate conditions were established by studying the color reaction between erythrosine B and the studied drugs to obtain the maximum sensitivity. Beer-Lambert's law is obeyed in the concentration ranges 1–7, 1–8, and 1–6 g/mL for (I, IV), (II, III), and (V), respectively. The method was validated according to ICH guidelines. The suggested method is applicable for the determination of the five investigated drugs in bulk and pharmaceutical dosage forms with excellent recoveries.

Rapid Spectrophotometric Method for Determination of Benzoic and Cinnamic Acids in Balsam Tolu

1979 ◽  
Vol 62 (1) ◽  
pp. 82-84
Author(s):  
Sawsan El-Masry
Keyword(s):  
Standard Deviation ◽  
Solvent Extraction ◽  
Organic Solvent ◽  
Relative Standard Deviation ◽  
Spectrophotometric Method ◽  
Cinnamic Acids ◽  
Organic Solvent Extraction ◽  
Relative Standard ◽  
The Individual

Abstract A rapid spectrophotometric method is described for the individual assay of balsamic acids. The method has been applied to the determination of benzoic and cinnamic acids in samples of balsam tolu. Compared with the British Pharmaceutical Codex procedure, the recommended method combines the advantages of a faster analysis and the determination of individual balsamic acids without the need of organic solvent extraction. The sample is saponified and purified and the 2 balsamic acids are determined spectrophotometrically using the 2-wavelength method of analysis. The method has been successfully applied to the analysis of 4 batches of balsam tolu. The relative standard deviation is 1.85%.

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