scholarly journals Flow-injection Analysis Technique Used to Electrochemically Measure Nitrite through a Gold Working Electrode Modified with 1-2 Diaminobenzene (DAB)

2010 ◽  
Vol 5 (2) ◽  
pp. 134-139
Author(s):  
F. L. Almeida ◽  
S. G. Dos Santos Filho ◽  
M. B. A. Fontes
Keyword(s):  
Ascorbic Acid ◽  
Uric Acid ◽  
Human Health ◽  
Flow Injection ◽  
Flow Injection Analysis ◽  
Working Electrode ◽  
Low Concentrations ◽  
Analysis Technique ◽  
Silk Screen

In this paper, it is presented nitrite analysis, electrochemically measured, using a Flow-injection Analysis (FIA) system. The importance of determining nitrite from water, food and blood is based on its toxicity for human health, even at low concentrations (<4mM). The presented electrochemical planar sensor uses silk-screen technology and has a working electrode covered with 1-2 Diaminobenzene (DAB) that allowed good selectivity, reproductively, stability and sensitivity at 0.75 VAg/AgCl Nafion® 117, 0.5 VAg/AgCl Nafion® 117 and 0.3 VAg/AgCl Nafion® 117. It was noteworthy that nitrite response adds to the response of the studied interfering elements (paracetamol, ascorbic acid and uric acid) and it is predominant for concentrations lower than 175 μmol L-1. Finally, the nitrite sensitivity was 11.2 mA mol-1 L mm-2 using the working electrode recovered with DAB at 0.5 VAg/AgCl Nafion®117.

The Determination of Catechols in the Presence of Ascorbic Acid and Uric Acid by Flow Injection Analysis Employing a Potentiometric Dibenzo-18-crown-6 Electrode Detector

1994 ◽  
Vol 27 (11) ◽  
pp. 2141-2151 ◽  
Author(s):  
Suzanne K. Lunsford ◽  
A. Galal ◽  
N. Akmal ◽  
Y. L. Ma ◽  
H. Zimmer ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Uric Acid ◽  
Flow Injection ◽  
Flow Injection Analysis

Determination of ammonia in low concentrations with Nessler's reagent by flow injection analysis

The Analyst ◽  
1979 ◽  
Vol 104 (1234) ◽  
pp. 47 ◽  
Author(s):  
F. J. Krug ◽  
J. Růžička ◽  
E. H. Hansen
Keyword(s):  
Flow Injection ◽  
Flow Injection Analysis ◽  
Low Concentrations

Direct analysis of ascorbic acid in food beverage samples by flow injection analysis using reduced graphene oxide sensor

2020 ◽  
Vol 319 ◽  
pp. 126509 ◽  
Author(s):  
Lucas Vinícius de Faria ◽  
Thalles Pedrosa Lisboa ◽  
Davi Marques de Farias ◽  
Fausto Moreira Araujo ◽  
Mateus Moura Machado ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Flow Injection ◽  
Flow Injection Analysis ◽  
Direct Analysis ◽  
Beverage Samples ◽  
Reduced Graphene

Semiautomatic Determination of Furanic Aldehydes in Food and Pharmaceutical Samples by a Stopped-Flow Injection Analysis Method

1993 ◽  
Vol 76 (6) ◽  
pp. 1255-1261 ◽  
Author(s):  
A Espinosa-Mansilla ◽  
A Muñoz Dela Peña ◽  
F Salinas
Keyword(s):  
Flow Injection ◽  
Flow Injection Analysis ◽  
Pharmaceutical Preparations ◽  
Thiobarbituric Acid ◽  
Food Samples ◽  
Analytical Determination ◽  
Stopped Flow ◽  
Analysis Method ◽  
Analysis Technique

Abstract A kinetic study of the reactions of 5-hydroxymethyl-2-furfuraldehyde and furfural with 2-thiobarbituric acid (TBA) by a stopped-flow flow injection analysis technique has been undertaken. A semiautomatic method for the analytical determination of these furanic aldehydes is proposed on the basis of reaction with TBA. The proposed stopped-flow method was successfully applied to several commercial pharmaceutical preparations and food samples. The procedure is faster than the earlier procedure for determination of these compounds in foods and pharmaceuticals.

Determination of total CO2 in plasma by automated flow-injection analysis.

1979 ◽  
Vol 25 (3) ◽  
pp. 443-445 ◽  
Author(s):  
H Baadenhuijsen ◽  
H E Seuren-Jacobs
Keyword(s):  
Flow Injection ◽  
Flow Injection Analysis ◽  
Indicator System ◽  
Rubber Membrane ◽  
Analysis Technique ◽  
Membrane Technique ◽  
Silicone Rubber Membrane ◽  
Acid Reagent ◽  
Set Up

Abstract We describe a procedure for measuring total CO2 in plasma, based on the principles of the flow-injection analysis technique, which makes use of unsegmented fast-flowing reagent streams, as developed by Růziĉka and co-workers. The further methodological design resembles the silicone-rubber membrane technique of Kenny and Cheng. CO2 in the sample is released by reaction with H2SO4. Appropriate amounts of CO2 permeate through the membrane that separates the acid reagent streams and a buffered cresol-red indicator system. The experimental set-up and functioning of this system are described.

Sign in / Sign up

Export Citation Format

Share Document