Spectrophotometric Determination of Lanthanum in Raffinate with Tribromoarsenazo

2014 ◽  
Vol 675-677 ◽  
pp. 1429-1432
Author(s):  
Xing Xin Chen ◽  
Kui Liu ◽  
Li Fang Kuang ◽  
Hua Long
Keyword(s):  
Ascorbic Acid ◽  
Hydrochloric Acid ◽  
Correlation Coefficient ◽  
Wavelength Range ◽  
Spectrophotometric Determination ◽  
Linear Relation ◽  
Acidic Environment ◽  
Beer's Law ◽  
Beer’S Law

Determination of lanthanum in the raffinate by spectrophotometry was studied, using tribromoarsenazo as chromogenic reagent. The addition of ascorbic acid can mask the interference of other metal cations in the solution. Under the conditions of ascorbic acid (10g·L-1) 5 mL, hydrochloric acid 0.04 mol·L-1 and tribromoarsenazo (0.5g·L-1) 2 mL, Beer’s law is obeyed in the range of 0-10 μg·(25mL)-1 for lanthanum, with correlation coefficient higher than 0.99. Beer’s law can be applicable for the wavelength range of 580-660 nm. There is no linear relation at too high or too low acidic environment.

scholarly journals Rapid Spectrophotometric Determination of Phenoxazine

2010 ◽  
Vol 7 (2) ◽  
pp. 1001-1005
Author(s):  
Baghdad Science Journal
Keyword(s):  
Detection Limit ◽  
Spectrophotometric Determination ◽  
Acidic Medium ◽  
Absorption Maximum ◽  
Aqueous Samples ◽  
Economic Method ◽  
Beer's Law ◽  
Beer’S Law ◽  
The Stability

A rapid high sensitive and inexpensive economic method has been developed for the Determination of phenoxazine by using molecular spectrophotometry. The method is based on the oxidation of phenoxazine by potassium (meta)periodate in acidic medium. The oxidation conditions were selected to enhance the sensitivity and the stability of the pink colored species which shows an absorption maximum at 530 nm. The Beer’s law was obeyed for phenoxazine concentration range from 1 to 6 µg mL-1 with 0.003 µg mL-1 detection limit and provided variation coefficients between 0.4 to 1.7 %. This method was successfully applied for the determination of phenoxazine in aqueous samples

scholarly journals Spectrophotometric Determination of Ziram in a Commercial Sample and Wheat by Extraction of Its Copper Dimethyldithiocarbamate Complex into Molten Naphthalene

2002 ◽  
Vol 85 (1) ◽  
pp. 146-148
Author(s):  
Ashok Kumar Malik ◽  
Avasarla L J Rao
Keyword(s):  
Spectrophotometric Determination ◽  
Final Solution ◽  
Wheat Grain ◽  
Reagent Blank ◽  
Commercial Sample ◽  
Dithiocarbamate Complex ◽  
Beer's Law ◽  
Beer’S Law

Abstract A method was developed for the determination of zinc(II) dimethyldithiocarbamate by converting it into the copper(II) dithiocarbamate complex, which is then extracted into molten naphthalene. The absorbance is measured at 430 nm versus a reagent blank. Beer's law is obeyed for concentrations of 0.63 × 10−3 to 17.2 × 10−3 g/L in the final solution. The method is sensitive and was applied to the determination of ziram in a commercial sample and in wheat grain.

scholarly journals Spectrophotometric Determination of Aciclovir, Cefepirne Hydrochloride, Etamsylate and Metoclopramide Hydrochloride Usina 1,10 Phenanttrroline—Fe(lll) Reaqent

2004 ◽  
Vol 72 (1) ◽  
pp. 73-86 ◽  
Author(s):  
Marwa S. Elazazy ◽  
Abdalla Shalaby ◽  
M. N. Elbolkiny ◽  
Hawa M. Khalil
Keyword(s):  
Spectrophotometric Determination ◽  
Pharmaceutical Formulations ◽  
Accurate Method ◽  
Pure Form ◽  
Reagent Blank ◽  
Experimental Conditions ◽  
Beer's Law ◽  
Beer’S Law ◽  
Metoclopramide Hydrochloride

A simple, rapid, sensitive and accurate method for the determination of aciclovir, cefepime HCI, etamsylate and metoclopramide HCI in pure form and in pharmaceutical formulations is developed.The method is based on the fomabon of tris(o-phenanthroline) iron(ll) complex (Ferroin) upon the reaction of the ated drugs wrth iron(lll )-o- phenanthroline mixture. The ferroin complex is colorimetncally measured at λmax 510 nm against a reagent blank. 0ptimization of the experimental conditions is described. Beer's law is obeyed in the concentration range from 0.25–30 µg ml−1 with molar absorpitivities (ε) ranging from 4.796 x 103–9.51 2 x 104 L.mol−1.cm−1 and Sandell sensitivities (S) of 2.129 x 10−3–34.5 x 10−3 µg cm−2. The developed method is applied successfully for the determination of the cited drugs in pure forms and in the corresponding pharmaceutical formulations without any interferences from common excipients.

scholarly journals Spectrophotometric Determination of Famciclovir and Racecodotril Using 2, 6-Dichloroquinone–Chlorimide

2007 ◽  
Vol 4 (1) ◽  
pp. 50-52 ◽  
Author(s):  
M. Vamsi Krishna ◽  
P. V. Madhavi Latha ◽  
D. Gowri Sankar
Keyword(s):  
Spectrophotometric Determination ◽  
Spectrophotometric Method ◽  
Oxidative Coupling ◽  
Pharmaceutical Preparations ◽  
Coupling Product ◽  
Beer's Law ◽  
Beer’S Law ◽  
Sensitive Spectrophotometric Method

A simple, sensitive spectrophotometric method for the determination of Famciclovir and Racecodotril is developed. It is based on the formation of a colored oxidative coupling product between 2,6-dichloroquinone-chlorimide and the drug is described. The method has been extended to pharmaceutical preparations. The absorption maxima and Beer’s law limits for Famciclovir are 500 nm, 20-100 µg/mL and for Racecodotril are 460 nm, 12.5-62.5 µg/mL.

Spectrophotometric Determination of Menadione and Menadione Sodium Bisulfite

1982 ◽  
Vol 65 (1) ◽  
pp. 141-143
Author(s):  
Madiha B Sidhom ◽  
Michel E El-Kommos
Keyword(s):  
Alkaline Medium ◽  
Spectrophotometric Determination ◽  
Spectrophotometric Method ◽  
Sodium Bisulfite ◽  
Routine Analysis ◽  
Menadione Sodium Bisulfite ◽  
Beer's Law ◽  
Violet Color ◽  
Beer’S Law

Abstract A spectrophotometric method is described for the determination of menadione and menadione sodium bisulfite in bulk and in solution for injection. The method measures the intensity of the violet color (λmax 540 nm) developed when menadione reacts with thiosemicarbazide in alkaline medium. Beer's law is obeyed in the concentration range 4-40 μg/m L (r = 0.9995). The method is simple, sensitive, and particularly suited for routine analysis of official menadione sodium bisulfite injection. Results are comparable with the USP method.

scholarly journals Spectrophotometric Determination of Paracetamol in bulk and Pharmaceutical Preparations

2015 ◽  
Vol 12 (2) ◽  
pp. 317-323
Author(s):  
Baghdad Science Journal
Keyword(s):  
Sodium Hydroxide ◽  
Spectrophotometric Determination ◽  
Spectrophotometric Method ◽  
Pharmaceutical Preparations ◽  
Coupling Reaction ◽  
Reaction Conditions ◽  
Accuracy And Precision ◽  
Beer's Law ◽  
Beer’S Law

A simple, and rapid spectrophotometric method for the estimation of paracetamol has been developed. The methods is based on diazotisation of 2,4-dichloroaniline followed by a coupling reaction with paracetamol in sodium hydroxide medium. All variables affecting the reaction conditions were carefully studied. Beer's law is obeyed in the concentration range of 4-350 ?gml?1 at 490 nm .The method is successfully employed for the determination of paracetamol in pharmaceutical preparations. No interferes observed in the proposed method. Analytical parameters such as accuracy and precision have been established for the method and evaluated statistically to assess the application of the method.

scholarly journals Development of Method for Extractive Spectrophotometric Determination of Fe(III) with 2-Hydroxy-1-Naphthalene Carboxaldehyde Phenyl Hydrazone as an Analytical Reagent

2013 ◽  
Vol 14 ◽  
pp. 7-12
Author(s):  
Ratnamala P. Sonawane ◽  
R.S. Lokhande ◽  
Utkarsha M. Chavan
Keyword(s):  
Ethyl Acetate ◽  
Spectrophotometric Determination ◽  
Spectrophotometric Method ◽  
Molar Absorptivity ◽  
Beer's Law ◽  
Beer’S Law ◽  
Coloured Complex ◽  
Analytical Reagent

A spectrophotometric method has been developed for the determination of Fe(III) using 2-Hydroxy-1-Naphthalene carboxaldehyde phenyl hydrazone as an extractive reagent. The reagent forms a coloured complex, which has been quantitatively extracted into ethyl acetate at pH 6. The method obeys Beer’s law over arrange from 1 to 7 ppm. The Molar absorptivity and Sandell’s sensitivity were 0.31 × 104 L mol-1cm-1 and 0.13 μg cm-2 respectively. The proposed method is very sensitive and selective. The method has been successfully applied to synthetic and commercial samples.

Spectrophotometric Determination of Piperazine and Its Salts in Pharmaceuticals

1979 ◽  
Vol 62 (5) ◽  
pp. 1138-1140
Author(s):  
Abdel M Abou-Ouf ◽  
Mohamed I Walash ◽  
Mohamed S Rizk ◽  
Fawzia A Ibrahim
Keyword(s):  
Spectrophotometric Determination ◽  
Nitrous Acid ◽  
Beer's Law ◽  
Beer’S Law

Abstract A spectrophotometric determination of piperazine and some of its salts is described. The method depends on the UV measurement of the N-nitroso derivatives formed by the interaction of piperazine with nitrous acid. The chromophore is developed by heating the reaction mixture at 80°C for 15 min, at pH 2.3-2.6. Beer's law is obeyed in the range 1-15 μg/mL.

scholarly journals Spectrophotometric determination of Clinidipine, Efavirenz, Prazosin drugs by using Folin-Ciocalteu Reagent

2020 ◽  
Vol 13 (3) ◽  
pp. 210-217
Author(s):  
Naveen Reddy Pailla ◽  
Bhaskar Kuthati
Keyword(s):  
Alkaline Medium ◽  
Spectrophotometric Determination ◽  
Spectrophotometric Method ◽  
Absorption Maximum ◽  
Ich Guidelines ◽  
Beer's Law ◽  
Beer’S Law

For the determination of three drugs namely Cilnidipine (CDP), Efavirenz (EVZ), Prazosin (PRZ), a simple, fast, selective and accurate spectrophotometric method has been outlined. This method is based on the development of blue coloured chromogen due to reduction of tungstate and/ or molybdate in Folin-Ciocalteu reagent by Drug in alkaline medium. The coloured species has an absorption maximum at 730 nm, 745 nm and 770 nm and the Beer’s law obeys over the concentration range of 12-72 μg/mL, 10-70 μg/mL, 3-21 μg/mL respectively for the drugs CDP, EVZ, PRZ. This method has been validated according to ICH guidelines and applied to the analysis of pharmaceuticals.

Spectrophotometric determination of zinc with 5-methyl-1,3,4-thiadiazolyl-(2-azo-1)-2-naphthol

1983 ◽  
Vol 48 (2) ◽  
pp. 464-470 ◽  
Author(s):  
Juan Cacho ◽  
Cristina Nerin
Keyword(s):  
Spectrophotometric Determination ◽  
Organic Phase ◽  
Molar Absorptivity ◽  
Beer's Law ◽  
Optimum Ph ◽  
Beer’S Law ◽  
Ph Range ◽  
Optimum Ph Range

The reaction of Zn(II) with 5-methyl-1,3,4-thiadiazolyl-(2-azo-1)-2-naphthol (MTDAN) and extraction of the complex formed in chloroform is studied. The optimum pH range for the extraction and formation of the complex is 10-11.2 and Beer's law is obeyed in the interval of 0-2 ppm of Zn(II) in the organic phase. The molar absorptivity is 5.9 . 104 l mol-1 cm-1 at 568 nm. The stoichiometry of the complex corresponds to the type ML2. Some interferences are studied and an easy way is given to eliminate them. The results are compared with those corresponding to TAN. The reaction is applied to the analysis of synthetic samples of bronzes with satisfactory results.

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