scholarly journals A novel online coupling of ion selective electrode with the flow injection system for the determination of vitamin B1

2016 ◽  
Vol 13 (2) ◽  
pp. 458-469
Author(s):  
Baghdad Science Journal
Keyword(s):  
Flow Injection ◽  
Dynamic Range ◽  
Limit Of Detection ◽  
Vitamin B1 ◽  
Pharmaceutical Formulations ◽  
Ion Selective Electrode ◽  
Injection System ◽  
Selective Electrode ◽  
Flow Injection System

A simple, fast, selective of a new flow injection analysis method coupled with potentiometric detection was used to determine vitamin B1 in pharmaceutical formulations via the prepared new selective membranes. Two electrodes were constructed for the determination of vitamin B1 based on the ion-pair vitamin B1-phosphotungestic acid (B1-PTA) in a poly (vinyl chloride) supported with a plasticized di-butyl phthalate (DBPH) and di-butyl phosphate (DBP). Applications of these ion selective electrodes for the determination of vitamin B1 in the pharmaceutical preparations for batch and flow injection systems were described. The ion selective membrane exhibited a near-Nernstian slope values 56.88 and 58.53 mV / decade, with the linear dynamic range of vitamin B1 was 5 x 10-5- 1 x 10-2 and 1 x 10-4-1 x 10-2 mol.L-1, in batch and FIA, respectively. The limit of detection was 3.5 x 10-5 and 9.5 x 10-5 mol.L-1, with the percentage linearity 98.85 and 95.22 in batch and FIA, respectively. The suggested ion selective electrode has been utilized perfection in the determination of vitamin B1 in pharmaceutical formulations using batch and flow injection system, respectively.

scholarly journals Determination of Picogram Levels of Roxithromycin in Pharmaceutical, Human Serum, and Urine by Flow-Injection Chemiluminescence

2012 ◽  
Vol 2012 ◽  
pp. 1-5
Author(s):  
Jiangman Liu ◽  
Huan Yang ◽  
Yun Zhang ◽  
Min Wu ◽  
Haixiang Zhao ◽  
...  
Keyword(s):  
Human Serum ◽  
Flow Injection ◽  
Limit Of Detection ◽  
Inhibitory Effect ◽  
Injection System ◽  
Relative Standard ◽  
Flow Injection System ◽  
Flow Injection Chemiluminescence ◽  
Serum And Urine

A sensitive chemiluminescence (CL) method, based on the inhibitory effect of roxithromycin (ROX) on the CL reaction between luminol and dissolved oxygen in a flow-injection system, was first proposed for the determination of ROX at picogram levels. The decrement of CL intensity was linearly proportional to the logarithm of ROX concentrations ranging from 0.1 to 100 pg mL-1, giving the limit of detection (LOD) of 0.03 pg mL-1 (3σ). At a flow rate of 2.0 mL min-1, a complete analytical procedure including sampling and washing could be performed within 0.5 min, with relative standard deviations (RSDs) of less than 5.0% (n=5). The proposed procedure was applied successfully to the determination of ROX in pharmaceutical, human serum, and urine with the recoveries ranging from 90.0 to 110.0%.

Nonmonotonic Transient Potential Signals with an 18-Crown-6 based Ion-Selective Electrode in a Flow-Injection System

2003 ◽  
Vol 15 (19) ◽  
pp. 1536-1540 ◽  
Author(s):  
Joaquín A. Ortuño ◽  
Concepción Sánchez-Pedreño ◽  
Domingo Martinez
Keyword(s):  
Flow Injection ◽  
Ion Selective Electrode ◽  
Injection System ◽  
Selective Electrode ◽  
Flow Injection System

scholarly journals Sequential determination of free and total cyanide by flow injection

1999 ◽  
Vol 21 (1) ◽  
pp. 23-26 ◽  
Author(s):  
Maria Angélica Bonadiman Martin ◽  
Edgard Moreira Ganzarolli ◽  
Arilson Lehmkuhl ◽  
Ivan Gonçlves de Souza ◽  
Roldão Roosevelt Urzêdo de Queiróz
Keyword(s):  
Flow Injection ◽  
Direct Detection ◽  
Chemical Species ◽  
Diffusion Chamber ◽  
Gas Diffusion ◽  
Ion Selective Electrode ◽  
Injection System ◽  
Selective Electrode ◽  
Sequential Determination

This study presents a flow injection system for the sequential determination of free (CN-) and total (CN-+ HCN) cyanide using a potentiometric method which employs two different processes for the determination of these two chemical species. The first process is based on direct detection of CN-using an ion-selective electrode for cyanide. In the second process, the sample is mixed with acid, and the released HCN is transferred across a PTFE membrane. The flow system employs three solenoid valves, a gas diffusion chamber, an ion-selective electrode, a potentiometer, and a computer with an AID conversion card. A Turbo Pascal®computer program automatically performs all the steps involved in data acquisition and processing. The standard deviation for the results obtained with the proposed method was 0.5%.

POTENTIOMETRIC FLOW-INJECTION DETERMINATION OF MERCURY IONS USING DIANTIPYRILPROPYLMETHAN BASED ELECTRODE

2018 ◽  
Vol 84 (9) ◽  
pp. 28-33
Author(s):  
S. D. Tataeva ◽  
A. Sh. Ramazanov ◽  
K. E. Magomedov ◽  
R. Z. Zeynalov
Keyword(s):  
Flow Injection ◽  
Optimal Operation ◽  
Injection System ◽  
Electrochemical Characteristics ◽  
Mercury Ions ◽  
Selective Electrode ◽  
Operation Conditions ◽  
Flow Injection System ◽  
The Stability

The possibility of using diantipyrylpropylmethane (DAPPM) as an electrode-active membrane component of the mercury-selective electrode (Hg-SE) is shown. To clarify the mechanism of membrane functioning we studied the equilibrium in the “membrane-solution” system as a function of the medium acidity and amount of the ionophore. The potentiometric selectivity coefficients of Hg-SE are determined with respect to some anions and cations by the method of bionic potentials. DAPPM at pH 0 - 1.5 is in the cation form, and mercury ions in 0.1 M HCl — in the form of a trichloromercurium ion. The ion associate DAPPM + [HgCl3]-formed under these conditions is the most stable at pH 1 and pCl 1, and the membrane responds only to trichloromercurate ions.. A mercury-selective electrode with an optimized membrane composition (in wt. %) contains: PVC — 32.32; o-NPOE — 64.63; DAPPM — 3.05 (DAPPM concentration 100 mM). The electrochemical characteristics are determined: the linear range (1 x 10-4- 1 x 10-2M) and slope of the electrode function (50 mV/dec). The operating range (pH 0 - 1.5), detection limit (6.3 x 10-5M), and the response time (15 - 20 sec) are determined. For optimal operation of the flow-injection system, a selection of the carrier stream has been made, which affects the stability of the line, the sensitivity and the performance of the analysis. The proposed electrode is used as a detector in the flow-injection determination of mercury in sewage water and “Achromin” cream. Optimum operation conditions of the flow-injection system which ensure the stability of the baseline, as well as the maximum sensitivity and performance of the analysis, are found. The correctness of the results of the determination of mercury is confirmed in spike tests.

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