Kinetic spectrophotometric method for trace determination of thiocyanate based on its inhibitory effect

2010 ◽  
Vol 75 (3) ◽  
pp. 1152-1158 ◽  
Author(s):  
Radhey M. Naik ◽  
Basant Kumar ◽  
Abhas Asthana
Keyword(s):  
Spectrophotometric Method ◽  
Inhibitory Effect ◽  
Trace Determination ◽  
Kinetic Spectrophotometric

scholarly journals Kinetic spectrophotometric determination of hydrazine

2010 ◽  
Vol 8 (3) ◽  
pp. 559-565 ◽  
Author(s):  
Violeta Mitic ◽  
Snezana Nikolic ◽  
Vesna Stankov-Jovanovic
Keyword(s):  
Spectrophotometric Method ◽  
Pure Water ◽  
Inhibitory Effect ◽  
Pharmaceutical Product ◽  
The Novel ◽  
Water Steam ◽  
Real Samples ◽  
Kinetic Spectrophotometric ◽  
Steam System

AbstractA kinetic spectrophotometric method for hydrazine determination in the range of 9.36×10−7 to 4.37×10−5 mol dm−3, based on the inhibitory effect of hydrazine on the oxidation of Victoria Blue 4- R by KBrO3, was developed and validated. Kinetic parameters are reported for both the indicating and the inhibiting reaction. The detection limit was established as 9.98×10−8 mol dm−3. The selectivity of the proposed method was tested considering the influence of different ions that may be present in real samples. The method was successfully applied for hydrazine determination in various samples (very pure water from the water-steam system of a power plant and Isoniazid tablets, a pharmaceutical product). The novel kinetic spectrophotometric method proposed was found to have satisfactory analytical characteristics as well as being widely applicable due to its simplicity and speed.

scholarly journals A New Inhibition Kinetic Spectrophotometric Method for the Determination of Resorcinol

2010 ◽  
Vol 7 (3) ◽  
pp. 727-732
Author(s):  
Mohsen Keyvanfard
Keyword(s):  
Spectrophotometric Method ◽  
Fixed Time ◽  
Inhibitory Effect ◽  
Cresyl Violet ◽  
Relative Standard ◽  
Fast Kinetic ◽  
Kinetic Spectrophotometric ◽  
Replicate Measurements ◽  
Catalyzed Oxidation

A new, simple, inexpensive and fast kinetic spectrophotometric method was developed for the determination of trace amounts of resorcinol over the range of 0.02-0.80 μg/mL. The method is based on the inhibitory effect of resorcinol on the formaldehyde catalyzed oxidation reaction of of cresyl violet by bromate in acidic media is reported. The reaction was monitored spectrophotometrically by measuring the decrease in absorbance of cresyl violet at 596 nm with a fixed-time 0.5–2.5 min from initiation of the reaction.The detection limit is 0.017 μg/mL and relative standard deviation of 0.1 and 0.5 μg/mL resorcinol for six replicate measurements was 2.6 and 2.9 %, respectively. The method was applied to the determination of resorcinol in water samples.

scholarly journals The Development of a New Inhibition Kinetic Spectrophotometric Method for the Determination of Phenylhydrazine Based on its Inhibitory Effect on Oxidation of Methyl Red by Bromate in Micellar Medium

2010 ◽  
Vol 7 (4) ◽  
pp. 1591-1597
Author(s):  
Mohsen Keyvanfard
Keyword(s):  
Standard Deviation ◽  
Spectrophotometric Method ◽  
Fixed Time ◽  
Inhibitory Effect ◽  
Methyl Red ◽  
Micellar Medium ◽  
Relative Standard ◽  
Inhibition Kinetic ◽  
Kinetic Spectrophotometric

A new, simple, sensitive and selective kinetic spectrophotometric method was developed for the determination of trace amounts of phenylhydrazine over the range of 0.02-0.30 μg/mL. The method is based on the inhibitory effect of phenylhydrazine on the oxidation of methyl red by bromate in acidic and micellar medium. The reaction was monitored spectrophotometrically by measuring the decrease in absorbance of methyl red at 518 nm with a fixed-time 0.5–2.0 min from initiation of the reaction..The relative standard deviation of 0.08 and 0.2 μg/mL phenylhydrazine was 1.7 and 2.4%, respectively. The method was applied to the determination of phenylhydrazine in water samples.

scholarly journals Trace determination of isoniazid at micro level using kinetic spectrophotometric method

2021 ◽  
pp. 17-17
Author(s):  
Rupal Yadav ◽  
Indresh Kumar ◽  
Radhey Naik
Keyword(s):  
Spectrophotometric Method ◽  
Pharmaceutical Formulations ◽  
Fixed Time ◽  
Official Method ◽  
Trace Determination ◽  
Reaction Conditions ◽  
Optimum Reaction ◽  
Kinetic Spectrophotometric ◽  
Fixed Times

An effective and fairly inexpensive spectrophotometric method for trace determination of isoniazid INH in pure form as well as in pharmaceutical formulations has been developed through ligand substitution reaction between INH and aquapentacyanoruthenate (II) ion ([Ru(CN)5OH2]3-) in aqueous medium at ?max = 502 nm. The fixed time procedure has been employed under optimum reaction conditions. The calibration equations, relating absorbance measured at 502 nm at fixed times (tn = 2, 5 and 7 min) and cINH in linear range (1.37 - 27.43) ?g mL-1, were used for trace determination of INH has been reported in the present investigation which are in agreement with official and reported methods. The percentage recovery has been calculated and found to be within the range of (99 - 101 %) in the analysis of different pharmaceutical samples. The results reveal that the use of common recipients as additives do not produce any type of interference in proposed method. The validity of the proposed method was also checked by statistical analysis which agreed with the results obtained using official method. The present method is very simple, reproducible, sensitive and it can be adopted for trace determination of INH in different samples without using extracting agent.

scholarly journals New Kinetic Spectrophotometric Method for Determination of Folic Acid in Pharmaceutical Formulations

2015 ◽  
Vol 50 ◽  
pp. 169-178
Author(s):  
Mouhammed Khateeb ◽  
Basheer Elias ◽  
Fatema Al Rahal
Keyword(s):  
Folic Acid ◽  
Spectrophotometric Method ◽  
Pharmaceutical Formulations ◽  
Fixed Time ◽  
Rate Data ◽  
Sulfuric Acid Medium ◽  
Significant Difference ◽  
Kinetic Spectrophotometric ◽  
Comparison Of The Results

A simple and sensitive kinetic spectrophotometric method has been developed for the determination of folic acid (FA) in bulk and pharmaceutical Formulations. The method is based on the oxidation of FA by Fe (III) in sulfuric acid medium. Fe (III) subsequently reduces to Fe (II) which is coupled with potassium ferricyanide to form Prussian blue. The reaction is followed spectrophotometrically by measuring the increase in absorbance at λmax 725 nm. The rate data and fixed time methods were adopted for constructing the calibration curves. The linearity range was found to be 1–20 μg mL-1 for each method. The correlation coefficient was 0.9978 and 0.9993, and LOD was found to be 0.91 and 0.09 μg mL-1 for rate data and fixed time methods, respectively. The proposed method has been successfully applied to the determination of FA in formulations with no interference from the excipients. Statical comparison of the results shows that there is no significant difference between the proposed and pharmacopoeial methods

scholarly journals Kinetic Spectrophotometric Method for the Determination of Trace Amounts of Oxalate by an Activation Effect

2006 ◽  
Vol 22 (2) ◽  
pp. 333-336 ◽  
Author(s):  
Mansour Arab CHAMJANGALI ◽  
Vahid KELEY ◽  
Ghadamali BAGHERIAN
Keyword(s):  
Spectrophotometric Method ◽  
Activation Effect ◽  
Kinetic Spectrophotometric

scholarly journals The Development of a New Kinetic Spectrophotometric Method for the Determination of Vanadium(V) Based on its Catalytic Effect on the Oxidation of Malachite Green Oxalate by Bromate in Acidic and Micellar Medium

2010 ◽  
Vol 7 (4) ◽  
pp. 1612-1620 ◽  
Author(s):  
M. Keyvanfard ◽  
N. Abedi
Keyword(s):  
Malachite Green ◽  
Spectrophotometric Method ◽  
Catalytic Effect ◽  
Limit Of Detection ◽  
Fixed Time ◽  
Micellar Medium ◽  
Relative Standard ◽  
Kinetic Spectrophotometric ◽  
Malachite Green Oxalate

A new, simple, sensitive and selective kinetic spectrophotometric method was developed for the determination of ultra trace amounts of vanadium(V). The method is based on the catalytic effect of vanadium(V) on the oxidation of malachite green oxalate (MG) by bromate in acidic and micellar medium. The reaction was monitored spectrophotometrically by measuring the decrease in the absorbance of malachite green oxalate (MG) at 625 nm with a fixed-time method. The decrease in the absorbance of MG is proportional to the concentration of vanadium(V) in the range of 1-100 ng/mL with a fixed time of 0.5-2 min from the initiation of the reaction. The limit of detection is 0.71 ng/mL of vanadium(V). The relative standard deviation for the determination of 5, 30, 50 ng/mL of vanadium(V) was2.5% 2.6%, 2.4% and respectively. The method was applied to the determination of vanadium(V) in water samples.

scholarly journals Determination of Sodium Cromoglycate by a New Kinetic Spectrophotometric Method in Biological Samples

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Mohsen Keyvanfard ◽  
Khadijeh Alizad ◽  
Razieh Shakeri
Keyword(s):  
Standard Deviation ◽  
Sodium Cromoglycate ◽  
Spectrophotometric Method ◽  
Calibration Curve ◽  
Biological Samples ◽  
Limit Of Detection ◽  
Micellar Medium ◽  
Relative Standard ◽  
Kinetic Spectrophotometric

A new kinetic spectrophotometric method is described for the determination of ultratrace amounts of sodium cromoglycate (SCG). The method based on catalytic action of SCG on the oxidation of amaranth with periodate in acidic and micellar medium. The reaction was monitored spectrophotometrically by measuring the decrease in absorbance of the amaranth at 518 nm, for the first 4 min from initiation of the reaction. Calibration curve was linear in the range of 4.0−36.0 ng mL−1SCG. The limit of detection is 2.7 ng mL−1SCG. The relative standard deviation (RSD) for ten replicate analyses of 12, 20, and 28 ng mL−1SCG was 0.40%, 0.32%, and 0.53%, respectively. The proposed method was used for the determination of SCG in biological samples.

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