Gas diffusion and micellar catalysis in the flow injection determination of sulfite

The Analyst ◽  
1994 ◽  
Vol 119 (11) ◽  
pp. 2447-2452 ◽  
Author(s):  
Alma María García Prieto ◽  
José Luis Pérez Pavón ◽  
Bernardo Moreno Cordero
Keyword(s):  
Flow Injection ◽  
Gas Diffusion ◽  
Micellar Catalysis

scholarly journals Automation of flow injection gas diffusion-ion chromatography for the nanomolar determination of methylamines and ammonia in seawater and atmospheric samples

1995 ◽  
Vol 17 (6) ◽  
pp. 205-212 ◽  
Author(s):  
Stuart W. Gibb ◽  
John W. Wood ◽  
R. Fauzi ◽  
C. Mantoura
Keyword(s):  
Ion Chromatography ◽  
Flow Injection ◽  
Aqueous Media ◽  
Control Unit ◽  
Gas Diffusion ◽  
Aqueous Sample ◽  
In Series ◽  
And Performance ◽  
Improved Design

The automation and improved design and performance of Flow Injection Gas Diffusion-Ion Chromatography (FIGD-IC), a novel technique for the simultaneous analysis of trace ammonia (NH3) and methylamines (MAs) in aqueous media, is presented. Automated Flow Injection Gas Diffusion (FIGD) promotes the selective transmembrane diffusion of MAs and NH3from aqueous sample under strongly alkaline (pH > 12, NaOH), chelated (EDTA) conditions into a recycled acidic acceptor stream. The acceptor is then injected onto an ion chromatograph where NH3and the MAs are fully resolved as their cations and detected conductimetrically. A versatile PC interfaced control unit and data capture unit (DCU) are employed in series to direct the selonoid valve switching sequence, IC operation and collection of data. Automation, together with other modifications improved both linearily (R2> 0.99 MAs 0-100 nM, NH30-1000 nM) and precision (<8%) of FIGD-IC at nanomolar concentrations, compared with the manual procedure. The system was successfully applied to the determination of MAs and NH3in seawater and in trapped particulate and gaseous atmospheric samples during an oceanographic research cruise.

Flow injection gas-diffusion method for preconcentration and determination of trace sulfide

1988 ◽  
Vol 60 (24) ◽  
pp. 2791-2796 ◽  
Author(s):  
Emil B. Milosavljevic ◽  
Ljiljana. Solujic ◽  
James L. Hendrix ◽  
John H. Nelson
Keyword(s):  
Flow Injection ◽  
Gas Diffusion ◽  
Diffusion Method ◽  
Gas Diffusion Method

Trace Levels Determination of Ammonium by Flow Injection Analysis Using Gas-Diffusion and Capacitively Coupled Contactless Conductivity Detection

2011 ◽  
Vol 23 (11) ◽  
pp. 2594-2600 ◽  
Author(s):  
Henrique L. Braz ◽  
Débora T. Ito ◽  
José A. Fracassi da Silva ◽  
Claudimir L. do Lago ◽  
Jairo J. Pedrotti
Keyword(s):  
Flow Injection ◽  
Flow Injection Analysis ◽  
Gas Diffusion ◽  
Conductivity Detection ◽  
Capacitively Coupled ◽  
Contactless Conductivity Detection

Determination of Sulfite in Food by Flow Injection Analysis

1986 ◽  
Vol 69 (3) ◽  
pp. 542-546 ◽  
Author(s):  
John J Sullivan ◽  
Thomas A Hollingworth ◽  
Marleen M Wekell ◽  
Richard T Newton ◽  
Jack E Larose
Keyword(s):  
Flow Injection ◽  
Flow Injection Analysis ◽  
Extraction Procedure ◽  
Food Product ◽  
Food Products ◽  
Peak Height ◽  
Gas Diffusion ◽  
Diffusion Cell ◽  
Low Concentrations

Abstract A method is described for the determination of sulfite levels in food products by flow injection analysis (FIA). The method is based on the decolorization of malachite green by S02, which is isolated from the flowing sample stream by means of a gas diffusion cell. The FIA method has a detection limit in food sample extracts of 0.1 ppm S02 (3 times peak height of blank), which corresponds to 1-10 ppm S02 in a food product, depending on the extraction procedure used. At the 5 ppm SO2 level in a food extract, the precision of replicate injections is ± 1-2%. The method was tested on a variety of both sulfite-treaied and untreated food products and the results compared favorably with those obtained by the Monier-Williams, colorimetric (pararosaniline), and enzymatic (sulfite oxidase) methods. The average differences from the FIA results were 19, 11, and 12%, respectively, for those samples (n = 12) above SO ppm S02. At lower levels the results were somewhat more erratic due to inaccuracies of the various methods at low concentrations.

Total Volatile Acids: Temperature Dependent Decomposition Indicator in Halibut Determined by Flow Injection Analysis

1994 ◽  
Vol 57 (6) ◽  
pp. 505-508 ◽  
Author(s):  
THOMAS A. HOLLINGWORTH ◽  
JAMES M. HUNGERFORD ◽  
JAMES D. BARNETT ◽  
MARLEEN M. WEKELL
Keyword(s):  
Elevated Temperature ◽  
Flow Injection ◽  
Flow Injection Analysis ◽  
Gas Diffusion ◽  
Diffusion Cell ◽  
Total Volatile ◽  
Temperature Dependent ◽  
Seafood Products

Total volatile acids (TVA) is a well known indicator for the decomposition of seafood products. A flow injection analysis (FIA) method, using a gas diffusion cell at elevated temperature, was developed for the determination of TVA in fish and applied to halibut. The FIA method is simple and rapid. The results of this study indicate that the correlation between levels of TVA and degree of decomposition is temperature dependent.

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