Direct spectrophotometric method for the determination of cobalt with indane 1,2,3-trionetrioxime in aqueous medium

1987 ◽  
Vol 92 (1-3) ◽  
pp. 57-63 ◽  
Author(s):  
D. Mallikarjuna Rao ◽  
K. Hussain Reddy ◽  
D. Venkata Reddy
Keyword(s):  
Aqueous Medium ◽  
Spectrophotometric Method

scholarly journals Investigation of the extraction equilibrium of ion-association complexes of molybdenum (VI) with some polyphenols and thiazolyl blue. extraction-spectrophotometric determination of molybdenum

2005 ◽  
Vol 3 (4) ◽  
pp. 747-755 ◽  
Author(s):  
Atanas Dimitrov ◽  
Vania Lekova ◽  
Kiril Gavazov ◽  
Boyan Boyanov
Keyword(s):  
Organic Solvent ◽  
Aqueous Medium ◽  
Spectrophotometric Method ◽  
Ion Association ◽  
Extraction Process ◽  
Association Constants ◽  
Optimum Conditions ◽  
Extraction Equilibrium ◽  
Simple Extraction

AbstractThe extraction process of ternary ion-association complexes of molybdenum (VI) with some polyphenols (4-nitrocatechol, 2,3-dihydroxy naphthalene) and thiazolyl blue has been investigated by using an extraction-spectrophotometric method. The optimum conditions for their quantitative preparation in aqueous medium and subsequent extraction into an organic solvent have been found. The extraction, distribution and association constants, and the recovery factors have been calculated. The composition of the complexes has been determined. A precise, sensitive and simple extraction-spectrophotometric method for determination of molybdenum in products from ferrous metallurgy has been developed.

scholarly journals Validated Spectrophotometric Method to Assay of B6 and B3 Vitamins in Pharmaceutical Forms Using Potassium Iodide and Potassium Iodate

2015 ◽  
Vol 60 ◽  
pp. 113-119 ◽  
Author(s):  
Mouhammed Khateeb ◽  
Basheer Elias ◽  
Fatema Al Rahal
Keyword(s):  
Comparative Study ◽  
Aqueous Medium ◽  
Potassium Iodide ◽  
Spectrophotometric Method ◽  
Pharmaceutical Formulations ◽  
Potassium Iodate ◽  
Pyridoxine Hydrochloride ◽  
Iodide Ions ◽  
Significant Difference

A simple, precise and reliable spectrophotometric method for the determination of pyridoxine hydrochloride (vitB6) and nicotinamide (vitB3) in pure form and pharmaceutical formulations has been described. The method is based on the reaction of studied vitamin with a mixture of potassium iodide and potassium iodate in aqueous medium at (250.5oC) to form yellow colored tri iodide ions (I3-). The reaction is followed spectrophotometrically by measuring the absorbance at 290, 335 and 288, 350 nm for vitB6 and vitB3 respectively. Beer's law was obeyed in the range of 0.5-20.0 μg mL-1 for all procedures. Molar absorptivities were found to be 1.49×104, 1.93×104 and 0.89×104, 1.25×104 L mol-1 cm-1, for determination of vitB6 and vitB3 at 290, 335 and 288, 350 nm respectively. The proposed method has been applied to determine the components in commercial forms with no interference from the excipients. A comparative study between the suggested procedures and the official methods showed no significant difference between the two methods.

Effective spectrophotometric study of the complexation reactions of 2-(2-pyridylazo)-1-naphthol-4-sulphonic acid with Zn(II) and Cd(II) using the SQUAD-G program

1982 ◽  
Vol 47 (10) ◽  
pp. 2654-2675 ◽  
Author(s):  
Luděk Jančář ◽  
Josef Havel ◽  
Vlastimil Kubáň ◽  
Lumír Sommer
Keyword(s):  
Aqueous Medium ◽  
Spectrophotometric Method ◽  
Spectrophotometric Study ◽  
Sulphonic Acid ◽  
Complexation Reactions

The existence of the red-orange protonated MLH complexes (λmax = 490 nm, εmax = 16 700 mmol-1 cm2, log *β111 = -0.51 for Zn(II) and λmax = 490 nm, εmax = 20 800 mmol-1 cm2, log *β111 = -1.28 for Cd(II)) and of the red-purple ML and ML2 complexes (λmax = 517 nm, εmax = 27 500 mmol-1 cm2, log *β112 = -2.8 and λmax = 527 nm, εmax = 61 500 mmol-1 cm2, log *β124 = -6.0 for Zn(II) and λmax = 522 nm, εmax = 27 200 mmol-1 cm2, log *β112 = -3.9 and λmax = 522 nm, εmax = 52 000 mmol-1 cm2, log *β124 = -8.2 for Cd(II) ions) was demonstrated in aqueous medium by numerical interpretation of the absorbance curves by the SQUAD-G minimization program. Conditions were proposed for development of a spectrophotometric method for the determination of Zn(II) and Cd(II) using 1-PAN-4S.

scholarly journals Synthesis ,spectroscopic study of Antipyryl azo 2-Naphthol and use it as new reagent for determination of Co(II) and Cu(II)

2013 ◽  
Vol 10 (3) ◽  
pp. 977-985
Author(s):  
Baghdad Science Journal
Keyword(s):  
Optimum Condition ◽  
Spectroscopic Study ◽  
Aqueous Medium ◽  
Stability Constants ◽  
Spectrophotometric Method ◽  
Full Color ◽  
Color Development ◽  
The Stability ◽  
Sensitive Spectrophotometric Method

A simple ,accurate and sensitive spectrophotometric method has been developed the determination of Cobalt(II) and Cupper (II) .The method is based on the chelation of Co(II) and Cu(II) ions with 4-(4´-pyrazolon azo) -2-Naphthol(APAN) in aqueous medium . The complexes have a maximum absorption at (513) and (506) nm and ? max 0.531×10 4 and 0.12×10 5 L.mol -1.cm -1 for Co(II) and Cu(II) respectively .The reagent and two complexes have been prepared in ethanolic solution.The stoichiometry of both complexes were found to be 1:2 (metal :legend) .The effects of various cations and anions on Co(II) and Cu(II) determination have been investigated .The stability constants and standard deviations for Co(II) and Cu(II) 0.291 x107 ,0.909X108 L.mol -1 ,(0.291) and (0.332) respectively .The optimum condition for full color development for described methods were applied satisfactorily to synthetic samples.

Extractive Spectrophotometric Method for the Determination of Glibenclamide by Ion-Pair Complex in Pure Form and Pharmaceutical Formulation

2019 ◽  
Vol 9 (o3) ◽  
Author(s):  
RUAA MUAYAD MAHMOOD ◽  
HAMSA MUNAM YASSEN ◽  
SAMAR , NAJWA ISSAC ABDULLA AHMED DARWEESH ◽  
NAJWA ISSAC ABDULLA
Keyword(s):  
Spectrophotometric Method ◽  
Molar Absorptivity ◽  
Ion Pair ◽  
Pharmaceutical Formulation ◽  
Ratio Method ◽  
Colored Complex ◽  
Colored Product ◽  
Method Of Continuous Variation ◽  
Job's Method

Simple, rapid and sensitive extractive spectrophotometric method is presented for the determination of glibenclamide (Glb) based on the formation of ion-pair complex between the Glb and anionic dye, methyl orange (MO) at pH 4. The yellow colored complex formed was quantitatively extracted into dichloromethane and measured at 426 nm. The colored product obeyed Beer’s law in the concentration range of (0.5-40) μg.ml-1. The value of molar absorptivity obtained from Beer’s data was found to be 31122 L.mol-1.cm-1, Sandell’s sensitivity value was calculated to be 0.0159 μg.cm-2, while the limits of detection (LOD) and quantification (LOQ) were found to be 0.1086 and 0.3292 μg.ml-1, respectively. The stoichiometry of the complex created between the Glb and MO was 1:1 as determined via Job’s method of continuous variation and mole ratio method. The method was successfully applied for the analysis of pharmaceutical formulation.

UV spectroscopic method for determination of phenytoin in bulk and injection forms

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Quality Control ◽  
Spectrophotometric Method ◽  
Spectroscopic Method ◽  
Ich Guidelines ◽  
Precision And Accuracy ◽  
Routine Quality Control

Recent study was conducted to develop a simple UV spectrophotometric method to determine Phenytoin in bulk and injection form according to official requirement and validate as per ICH guidelines. λmax of Phenytoin was found 202 nm. Linearity existed perceived in the concentration assortment 2-8 μg/ml (r2 = 0.999) for the method. The method was validated pertaining to linearity, precision and accuracy studies, LOD and LOQ consistent with ICH guidelines. The existent method was establish to be simple, linear, precise, accurate as well as sensitive and can be applied for routine quality control enquiry for the analysis of Phenytoin in bulk and injection form.

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