scholarly journals DEVELOPMENT OF FLOW INJECTION METHOD FOR ONLINE DETERMINATION OF THIOCYANATE BASED ON OXIDATION BY PERMANGANATE

2010 ◽  
Vol 10 (2) ◽  
pp. 167-171 ◽  
Author(s):  
Hermin Sulistyarti ◽  
Spas D. Kolev ◽  
Stephanie Lim
Keyword(s):  
Detection Limit ◽  
Thyroid Gland ◽  
Flow Injection ◽  
Hydrogen Cyanide ◽  
Figures Of Merit ◽  
Sample Throughput ◽  
Teflon Membrane ◽  
Developing Method ◽  
Analytical Figures Of Merit

The importance of developing method for thiocyanate becomes obvious, because thiocyanate can inhibit iodine uptake of thyroid gland leading to mumps disease. In this work, thiocyanate is oxidized by permanganate in the acid donor stream to cyanide, which is directly converted to hydrogen cyanide. Then, hydrogen cyanide diffuses through a Teflon membrane into acceptor stream containing nickel(II) in ammoniacal buffer to form tetracyanonickelate(II) which is detected spectrophotometrically at 267 nm. Analytical figures of merit were linear up to 50 mg L-1 for thiocyanate, with RSD of 1.34%, and detection limit of 0.07 mg L-1, respectively. Interfering anions were eliminated under stoichiometric amount of permanganate and sample throughput was 20 h-1. The method was validated for determining thiocyanate samples from synthetic and gold process waters with satisfactory results.   Keywords: Thiocyanate, flow injection, permanganate, spectrophotometry

scholarly journals Spectrophotometric flow injection procedure to indirect determination of paracetamol in pharmaceutical formulations using o-tolidine as reagent

2018 ◽  
Vol 33 (2) ◽  
pp. 47
Author(s):  
Orlando Fatibello-Filho ◽  
Heberth Juliano Vieira
Keyword(s):  
Standard Deviation ◽  
Detection Limit ◽  
Flow Injection ◽  
Pharmaceutical Formulations ◽  
Injection Method ◽  
Indirect Determination ◽  
Analytical Curve ◽  
Relative Standard ◽  
Injection Procedure

A spectrophotometric flow injection method for the determination of paracetamol in pharmaceutical formulations is proposed. The procedure was based on the oxidation of paracetamol by sodium hypochloride and the determination of the excess of this oxidant using o-tolidine dichloride as chromogenic reagent at 430 nm. The analytical curve was linear in the paracetamol concentration range from 8.50 x 10-6 to 2.51 x 10-4 mol L-1 with a detection limit of 5.0 x 10-6 mol L-1. The relative standard deviation was smaller than 1.2% for 1.20 x 10-4 mol L-1 paracetamol solution (n = 10). The results obtained for paracetamol in pharmaceutical formulations using the proposed flow injection method and those obtained using a USP Pharmacopoeia method are in agreement at the 95% confidence level.

scholarly journals Determination of Sulfate in Natural and Residual Waters by Turbidimetric Flow-Injection Analysis

2001 ◽  
Vol 84 (1) ◽  
pp. 59-64 ◽  
Author(s):  
Inês P A Morais ◽  
António O S S Rangel ◽  
M Renata S Souto
Keyword(s):  
Detection Limit ◽  
Flow Injection ◽  
Reference Method ◽  
Previous Treatment ◽  
Barium Chloride ◽  
Sulfate Solution ◽  
Injection System ◽  
Residual Water ◽  
Relative Standard

Abstract A turbidimetric flow-injection system was developed for the determination of sulfate in natural and residual water samples, with no previous treatment, using spectrophotometric detection. The precipitating agent, 7.0% (w/v) barium chloride solution prepared in 0.10% (w/v) polyvinyl alcohol, was added by using the merging-zones approach. A 100 mg/L sulfate solution in 0.07M nitric acid was mixed with the sample before it entered the injection loop to improve the detection limit, provide in-line pH adjustment, and prevent the interference of some anionic species. The relative standard deviations of the results were between 1.4 and 3.0% and were in agreement with results obtained by the reference method. Samples within a linear concentration range of 10–120 mg SO42−/L can be analyzed at a rate of 40/h. The detection limit is 5 mg SO42−/L.

Determination of formaldehyde by flow injection analysis with spectrophotometric detection exploiting brilliant green–sulphite reaction

2015 ◽  
Vol 69 (6) ◽  
Author(s):  
Lúcio Bolognesi ◽  
Eder J. dos Santos ◽  
Gilberto Abate
Keyword(s):  
Flow Injection ◽  
Flow Injection Analysis ◽  
Brilliant Green ◽  
Limit Of Detection ◽  
Spectrophotometric Detection ◽  
Sample Throughput ◽  
First Time

AbstractA method for the determination of formaldehyde by flow injection analysis with spectrophotometric detection is proposed, based on retarding the reaction between brilliant green and sulphite by the addition of formaldehyde; this was investigated for formaldehyde quantification in extracts from wood-based panels. For the first time, a heating step was explored, providing a sample throughput of 50 analyses per hour, with a limit of detection of 0.02 mg L

Competitive heterogeneous enzyme immunoassay for theophylline by flow-injection analysis with electrochemical detection of p-aminophenol

1990 ◽  
Vol 36 (4) ◽  
pp. 662-665 ◽  
Author(s):  
E P Gil ◽  
H T Tang ◽  
H B Halsall ◽  
W R Heineman ◽  
A S Misiego
Keyword(s):  
Alkaline Phosphatase ◽  
Detection Limit ◽  
Electrochemical Detection ◽  
Flow Injection ◽  
Flow Injection Analysis ◽  
General Procedure ◽  
Amperometric Detection ◽  
Enzyme Label ◽  
Commercial Kit

Abstract A competitive enzyme-linked immunoabsorbent assay based on the flow-injection amperometric detection of p-aminophenol has been investigated with use of the materials and general procedure of a commercial kit for the determination of theophylline in human serum. The antibody is immobilized on glass beads, and the enzyme label is alkaline phosphatase (EC 3.1.3.1). The high currents generated during the electrochemical detection allowed a rapid (35 min) and simple determination of theophylline throughout its therapeutic range (10-20 mg/L) and also in the subtherapeutic range (detection limit of about 80 micrograms/L).

scholarly journals A simple flow-injection method for the determination of blood glucose using a Technicon immobilized enzyme coil

1989 ◽  
Vol 11 (2) ◽  
pp. 87-88 ◽  
Author(s):  
Sveinbjörn Gizurarson
Keyword(s):  
Blood Glucose ◽  
Detection Limit ◽  
Flow Injection ◽  
Immobilized Enzyme ◽  
Single Channel ◽  
Glucose Solution ◽  
Injection System ◽  
Flow Injection System ◽  
Simple Flow

The applicability of a single-channel flow-injection system with immobilized enzyme coil (Technicon) and UV detection to the determination of glucose is described. The method was used for a pure glucose solution and for serum. The detection limit was 0.10 mM, the rate of determination was 20-40 per hour and the precision was satisfactory. The system is very simple and practical when many analysis are to be determined periodically.

Determination of Enoxacin in Tablet by Flow Injection Chemiluminescence

2012 ◽  
Vol 554-556 ◽  
pp. 1880-1883 ◽  
Author(s):  
Nai Lin Ren ◽  
Chi Yang
Keyword(s):  
Standard Deviation ◽  
Detection Limit ◽  
Flow Injection ◽  
Flow Injection Chemiluminescence

A new flow injection chemiluminescence (CL) method for the determination of Enoxacin（ENX）was described. The method was based on the weak CL reaction of Ce(Ⅳ)-SO32- sensitized by Pr3+- ENX. The relative CL intensity was linear with the concentration of ENX in the range of 3×10-8 g•mL-1~5.0×10-7 g•mL-1. The detection limit is 1.0×10-8 g•mL-1 .The rSuperscript textelative standard deviation (RSD) for the determination of 4.0×10-7 g•mL-1 ENX is 3.5% (n=11). The method has been successfully applied to the analysis of ENX in tablet

scholarly journals Determination of Thiocyanate by Kinetic Spectrophotometric Flow Injection Analysis

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Mohsen Keyvanfard ◽  
Khadijeh Alizad ◽  
Parinaz Elahian
Keyword(s):  
Detection Limit ◽  
Hydrochloric Acid ◽  
Flow Injection ◽  
Flow Injection Analysis ◽  
Calibration Graph ◽  
Well Water ◽  
Janus Green ◽  
Rapid Flow ◽  
Kinetic Spectrophotometric

A simple and rapid flow injection spectrophotometric method has been developed for the determination of amount of thiocyanate in wastewaters and well water samples. It is based on the reaction of thiocyanate in hydrochloric acid with janus green and bromate. Reaction was monitored spectrophotometrically by measuring janus green absorbance atλmax=554 nm. The calibration graph was linear over the range 0.02–1.0 μg mL−1and the detection limit was 0.016μg mL−1(s/n=3). The throughput was 25 samples per hour.

Ultrasensitive Chemiluminescence Detection of Indoleacetic Acid Catalyzed by Silver Nanoparticles

2011 ◽  
Vol 306-307 ◽  
pp. 1440-1443 ◽  
Author(s):  
Wen Wen Liu ◽  
Wei Hua Liu ◽  
Xue Min Mu ◽  
Pi Xue Gong ◽  
Wei Cao
Keyword(s):  
Silver Nanoparticles ◽  
Detection Limit ◽  
Flow Injection ◽  
Indoleacetic Acid ◽  
Optimum Conditions ◽  
Chemiluminescence Detection ◽  
Experimental Conditions ◽  
Acid Catalyzed ◽  
Flow Injection Chemiluminescence

A flow injection chemiluminescence (CL) method has been developed for the determination of indoleacetic acid (IAA). It is based on the fact that the weak CL of Ce(IV)-Ru(phen)32+ system is strongly enhanced in the presence of silver nanoparticles. Optimum conditions and possible mechanisms have been investigated. Under optimum experimental conditions, the linear range is from 1.0×10-8 – 6.0×10-7 g mL-1 with a detection limit 9.0×10-9 g mL-1

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