scholarly journals Analytical application of the reaction system methylene blue B-K2S2O8 for the spectrophotometric kinetic determination of silver in citric buffer media

2014 ◽  
Vol 68 (4) ◽  
pp. 429-434
Author(s):  
Sofija Rancic ◽  
Snezana Nikolic-Mandic ◽  
Aleksandar Bojic
Keyword(s):  
Methylene Blue ◽  
Room Temperature ◽  
Catalytic Effect ◽  
Kinetic Method ◽  
Reaction System ◽  
Silver Ions ◽  
Icp Oes ◽  
Kinetic Determination ◽  
Good Agreement

A new, simple, rapid, sensitive and selective spectrophotometric kinetic method for Ag(I) traces determination at room temperature was elaborated in this paper. It is based on catalytic effect of silver ions upon the oxidation of methylene blue B (MBB) by K2S2O8 (PPS) in citric buffer (BUF) solution. The method was confirmed by determination of Ag(I) in PbO. The obtained results were compared to those obtained by ICP-OES method and good agreement of results was found.

scholarly journals Application of the reaction system methylene blue B-(NH4)2S2O8 for the kinetic spectrophotometric determination of palladium in citric buffer media

2017 ◽  
Vol 71 (2) ◽  
pp. 97-104
Author(s):  
Sofija Rancic ◽  
Snezana Nikolic-Mandic ◽  
Aleksandar Bojic ◽  
Snezana Djoric-Veljkovic ◽  
Aleksandra Zarubica ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Reaction Rate ◽  
Catalytic Effect ◽  
Limit Of Detection ◽  
Reaction System ◽  
Icp Oes ◽  
Limit Of Quantification ◽  
Kinetic Spectrophotometric ◽  
Good Agreement

A new, simple, rapid, sensitive and selective kinetic spectrophotometric method for Pd(II) traces determination was elaborated in this paper. It is based on the catalytic effect of palladium ions upon the oxidation of methylene blue B (MBB) by (NH4)2S2O8 (APS) in citric buffer (BUF) solution. At the working temperature of 25 ?C and the wavelength of 662.4 nm, the optimal conditions for palladium determination were found. RSD value was found to be 2.6 to 4.9% for the investigated concentration range of Pd(II). Limit of detection (LD) was found to be 2.0 ng cm?3 Pd(II), and limit of quantification (LQ) is 6.9 ng cm?3 Pd(II). Only the presence of Pb2+, Hg2+ and Sn2+ in the reaction mixture interferes the determination of palladium by this method, while Au3+ and Ag+ have the catalytic effect upon the reaction rate. By this method, it is possible to determine the Pd(II) traces in the concentration range of 3.3x10?8 to 1.0x10?6 g cm?3. The method was confirmed by determination of Pd(II) traces in alloy PtRhG as well as in the powder of Pt. The obtained results were compared to those obtained by ICP-OES method and good agreement of results was found.

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.

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.

scholarly journals Kinetic Spectrophotometric Determination of Ethamsylate in Dosage Forms

2007 ◽  
Vol 90 (3) ◽  
pp. 679-685 ◽  
Author(s):  
Nahed El-Enany ◽  
Fathalla Belal ◽  
Mohamed Rizk
Keyword(s):  
Room Temperature ◽  
Kinetic Method ◽  
Pharmaceutical Preparations ◽  
Reference Method ◽  
Quantitation Limit ◽  
Experimental Parameters ◽  
Kinetic Spectrophotometric ◽  
Good Agreement

Abstract A simple and sensitive kinetic method has been developed for the determination of ethamsylate (ESL) in its pharmaceutical preparations. The method is based upon oxidation of ESL with 3-methyl-2-benzothiazolinone hydrazone hydrochloride in presence of cerium(IV) ammonium sulfate at room temperature for 20 min. The absorbance of the reaction product is measured at 514 nm. The absorbance-concentration plot was rectilinear over the range of 430 g/mL (r = 0.9999). The lower detection limit was 0.267 g/mL (9.110 106 M) and the lower quantitation limit was 0.808 g/mL. The different experimental parameters affecting the development and stability of the reaction product were studied and optimized. The proposed method was applied to the determination of ESL in formulations, and the results obtained were in good agreement with those obtained using a reference method. The proposed method was also used for the in vitro detection of ESL in spiked human plasma at its therapeutic concentration level.

scholarly journals Kinetic determination of ultramicro amounts of Cu(II) ion in solution

2003 ◽  
Vol 68 (3) ◽  
pp. 219-226 ◽  
Author(s):  
Zora Grahovac ◽  
Snezana Mitic ◽  
Emilija Pecev
Keyword(s):  
Hydrogen Peroxide ◽  
Detection Limit ◽  
Reaction Rate ◽  
Catalytic Effect ◽  
Kinetic Method ◽  
Kinetic Equations ◽  
Kinetic Determination ◽  
Concentration Interval ◽  
Ponceau 4R

A new kinetic method is described for the determination of ultramicro amounts of Cu(II) based on its catalytic effect on the oxidation of trisodium-2-hydroxy 1-(4-sulphonato-1-naphthylazo)naphthalene-6,8-disulphonato (red artificial color PONCEAU 4R) by hydrogen peroxide in borate buffer (B.B). The detection limit given by Perez-Bendito is 0.8 ng/cm3, but the detection limit that we experimentaly determined is 3.8 ng/cm3. The relative error ranges between 7.77 and 2.09%for the concentration interval 3.8 to 50.1 ng/cm3. Kinetic equations are proposed for the investigated process. The effects of certain foreign ions upon the reaction rate were determined for an assessment of the selectivity of the method. The method was applied for the determination of Cu(II) ions in samples of alloy.

Determination of protein with methylene blue-sodium tetraphenylborate phosphorescence probe solid substrate-room temperature phosphorimetry

2005 ◽  
Vol 549 (1-2) ◽  
pp. 32-38 ◽  
Author(s):  
Jia-Ming Liu ◽  
Shi-rong Hu ◽  
Zhi-yong Yang ◽  
Xue-Lin Li ◽  
Ping-ping Li ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Room Temperature ◽  
Solid Substrate ◽  
Sodium Tetraphenylborate ◽  
Phosphorescence Probe

scholarly journals Kinetic determination of As(III) in solution

2003 ◽  
Vol 68 (10) ◽  
pp. 765-769
Author(s):  
Sofija Rancic ◽  
Rangel Igov ◽  
Todor Pecev
Keyword(s):  
Acid Solution ◽  
Relative Error ◽  
Reaction Rate ◽  
Kinetic Method ◽  
Kinetic Equations ◽  
Strong Acid ◽  
Kinetic Determination

A new reaction is suggested and a new kinetic method is elaborated for the As(HI) traces determination in solution, on the basis of their catalyzing effect on komplexon III (EDTA) oxidation by KMnO4 in a strong acid solution (H2SO4). Using a spectrophotometric technique, a sensitivity of 72 ng/cm3 As(IIl) was achieved. The relative error of method varies from 5.5 to 13.9 % for As(HT) concentration range from 83 to 140 ng/cm-1. Appropriate kinetic equations are formulated and the influence of some other ions, including the As(V), upon the reaction rate is tested.

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