A kinetic method for the determination of nanogram amounts of cadmium (II) by its catalytic effect on the complex formation of manganese(II) with?,?,?,?-tetra-(p-sulf onatophenyl) porphine

1982 ◽  
Vol 78 (1-2) ◽  
pp. 149-158 ◽  
Author(s):  
Masaaki Tabata ◽  
Motoharu Tanaka
Keyword(s):  
Complex Formation ◽  
Catalytic Effect ◽  
Kinetic Method

scholarly journals Kinetic method for determination of copper(II) by the use of its catalytic effect on the oxidation reaction of cysteine.

1990 ◽  
Vol 6 (5) ◽  
pp. 769-770 ◽  
Author(s):  
Tamio KAMIDATE ◽  
Kazuo ITOH ◽  
Hiroto WATANABE
Keyword(s):  
Oxidation Reaction ◽  
Catalytic Effect ◽  
Kinetic Method ◽  
Determination Of Copper

scholarly journals Kinetic spectrophotometric determination of Bi(III) based on its catalytic effect on the oxidation of phenylfluorone by hydrogen peroxide

2009 ◽  
Vol 74 (8-9) ◽  
pp. 977-984
Author(s):  
Sofija Rancic ◽  
Snezana Nikolic-Mandic
Keyword(s):  
Hydrogen Peroxide ◽  
Spectrophotometric Determination ◽  
Reaction Rate ◽  
Catalytic Effect ◽  
Limit Of Detection ◽  
Kinetic Method ◽  
Limit Of Quantification ◽  
Kinetic Spectrophotometric ◽  
Good Agreement

A new reaction was suggested and a new kinetic method was elaborated for determination of Bi(III) in solution, based on its catalytic effect on the oxidation of phenyl-fluorone (PF) by hydrogen peroxide in ammonia buffer. By application of spectrophotometric technique, a limit of quantification (LQ) of 128 ng cm-3 was reached, and the limit of detection (LD) of 37 ng cm-3 was obtained, where LQ was defined as the ratio signal: noise = 10:1 and LD was defined as signal 3:1 against the blank. The RSD value was found to be in the range 2.8-4.8 % for the investigated concentration range of Bi(III). The influence of some ions upon the reaction rate was tested. The method was confirmed by determining Bi(III) in a stomach ulcer drug ('Bicit HP', Hemofarm A.D.). The obtained results were compared to those obtained by AAS and good agreement of results was obtained.

Kinetic and spectrophotometric studies of binding of iron(III) by glutathione

1976 ◽  
Vol 54 (20) ◽  
pp. 3192-3199 ◽  
Author(s):  
Tahir R. Khan ◽  
Cooper H. Langford
Keyword(s):  
Complex Formation ◽  
Kinetic Method ◽  
Binding Constants ◽  
Chelating Agent ◽  
Formation Reaction ◽  
Spectrophotometric Data ◽  
Natural Water Chemistry ◽  
Kinetics Of ◽  
Sulfur Containing

In this report, determination of unbound aquo iron species is accomplished by a kinetic method involving reaction with sulfosalicylic acid (SSA) on a time scale which is very short with respect to reaction of SSA with the glutathione complexes of iron. The data are used to calculate conditional binding constants for Fe(III) to glutathione. Binding constants in 0.1 M ionic strength media were obtained between pH 1 and 2.4 by the kinetic method, and near pH = 3 by spectrophotometry and by examination of the ratio of rate of complex formation and dissociation. The conditional binding 'constant' between pH 1 and 3 is represented as pK = −1.96 – 0.50pH. This is consistent with the importance of reactions involving only very limited proton release. Spectrophotometric data show that the —OH group on Fe(OH)2+ is lost on glutathione complexing. Kinetics of the complex formation reaction between aquo iron(III) species and glutathione are slower than rates of reaction of iron(III) with simple ligands.The glutathione system is regarded as a model system important to natural water chemistry because it is a widely distributed biological sulfur-containing chelating agent.

scholarly journals A Kinetic Method for the Determination of Copper(II) by Its Catalytic Effect on the Oxidation of 3-Methyl-2-benzothiazolinone Hydrazone with Hydrogen Peroxide: A Mechanistic Study

2005 ◽  
Vol 21 (8) ◽  
pp. 917-922 ◽  
Author(s):  
Takashi TOMIYASU ◽  
Satoshi AIKOU ◽  
Katsuro ANAZAWA ◽  
Hayao SAKAMOTO
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Effect ◽  
Kinetic Method ◽  
Mechanistic Study ◽  
Determination Of Copper

Kinetic method for the determination of traces of thyroxine by its catalytic effect on the Mn(III) metaphosphate–As(III) reaction

Talanta ◽  
2008 ◽  
Vol 74 (5) ◽  
pp. 1556-1561 ◽  
Author(s):  
Ferenc T. Pastor ◽  
Gordana A. Milovanović ◽  
Marija Todorović
Keyword(s):  
Catalytic Effect ◽  
Kinetic Method

scholarly journals A Novel Indicator Reaction for the Catalytic Determination of V(V) at ppb Levels by the Kinetic Spectrophotometric Method

2018 ◽  
Vol 39 (4) ◽  
pp. 49
Author(s):  
Halil İbrahim Ulusoy ◽  
Ramazan Gürkan
Keyword(s):  
Catalytic Effect ◽  
Tap Water ◽  
Kinetic Method ◽  
Fixed Time ◽  
Entire Concentration Range ◽  
Catalytic Determination ◽  
Certified Value ◽  
Kinetic Spectrophotometric ◽  
Good Agreement

A novel sensitive and relatively selective kinetic method is presented for the determination of V(V), based on its catalytic effect on the oxidation reaction of Ponceau Xylydine by potassium bromate in presence of 5-sulfosalicylic acid (SSA) as activator. The reaction was monitored spectrophotometrically by measuring the decrease in absorbance of Ponceau Xylydine at 640 nm between 0.5 to 7 min (the fixed time method) in H3PO4 medium at 25oC. The effect of various parameters such as concentrations of H3PO4, SSA, bromate and Ponceau Xylydine, temperature and ionic strength on the rate of net reaction were studied. The method is free from most interferences, especially from large amounts of V(IV). The decrease in absorbance is proportional to the concentration of V(V) over the entire concentration range tested (1–15 ng mL−1) with a detection limit of 0.46 ng mL–1 (according to statistical 3Sblank/k criterion) and a coefficient of variation (CV) of 1.8% (for ten replicate measurement at 95% confidence level).The proposed method suffers few interferences such as Cr(VI) and Hg(II) ions. The method was successfully applied to the determination of V(V) in tap water, drinking water, bottled mineralwater samples and a certified standard reference material such as SRM-1640 with satisfactory results. The vanadium contents of water samples were also determined by FAAS for a comparison.The recovery of spiked vanadium(V) was found to be quantitative and the reproducibility was satisfactory. It was observed that the results of the SRM 1640 were in good agreement with the certified value.

Kinetic method for the determination of trace amounts of copper(II) in water matrices by its catalytic effect on the oxidation of 1,5-diphenylcarbazide

2005 ◽  
Vol 539 (1-2) ◽  
pp. 317-325 ◽  
Author(s):  
Gastón Adrián Crespo ◽  
Francisco Javier Andrade ◽  
Fernando Alberto Iñón ◽  
Mabel B. Tudino
Keyword(s):  
Catalytic Effect ◽  
Kinetic Method
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