Continuous Flow Injection Reaction/Stopped Flow Detection Using Derivative Spectrophotometry. Determination of Cobalt and Iron in Mixtures

1996 ◽  
Vol 29 (6) ◽  
pp. 1013-1025 ◽  
Author(s):  
Pablo Richter ◽  
M. Inés Toral ◽  
Paola Hernández
Keyword(s):  
Flow Injection ◽  
Continuous Flow ◽  
Derivative Spectrophotometry ◽  
Stopped Flow ◽  
Flow Detection

Separation and determination of Cd in biological materials by continuous-flow fluid extraction coupled to flow-injection ICP-AES

1995 ◽  
Vol 351 (8) ◽  
pp. 802-804 ◽  
Author(s):  
E. Vereda Alonso ◽  
M. T. Siles Cordero ◽  
A. Garc�a de Torres ◽  
J. M. Cano Pav�n
Keyword(s):  
Flow Injection ◽  
Continuous Flow ◽  
Biological Materials ◽  
Fluid Extraction

scholarly journals Construction and evaluation of an automated flow injection-stopped flow analyser for multipoint reaction rate spectrophotometric methods. Determination of ammonia nitrogen, creatinine and phosphate

1991 ◽  
Vol 13 (5) ◽  
pp. 199-207 ◽  
Author(s):  
Constantinos A. Georgiou ◽  
Michael A. Koupparis
Keyword(s):  
Flow Injection ◽  
Reaction Rate ◽  
Assembly Language ◽  
Ammonia Nitrogen ◽  
Stopped Flow ◽  
Data Sampling ◽  
Ramp Generator ◽  
Spectrophotometric Methods ◽  
Blue Reaction

The construction and evaluation of a fully automated Flow Injection-Stopped Flow (FI-SF) spectrophotometric analyser is described. A microcomputer (Rockwell AIM 65) is used to control the analyser (sample injection, stop and start of the pump) through a suitable interface. Data acquisition is achieved using a 12 bit ADC card and a suitable subroutine in 6502 assembly language, allowing data sampling at a frequency of 7.5 kHz. The measurement interface and software were evaluated using a voltage ramp generator. A precision of 0.02-1.1% RSD (N =10) was obtained for voltage ramps in the range of 1-37 mVs-1. The FI-SF analyser was evaluated in routine analysis by developing FI-SF kinetic spectrophotometric methods for the determination of ammonia nitrogen (20-250 ppm, 0.4-2.5% RSD) based on the Berthelot reaction, creatinine (20-220 ppm, 0.9-3.6% RSD) based on the Jaffé reaction, and phosphate (5-30 ppm, 1.0-3.3% RSD) based on the phosphomolybdenum blue reaction. The reaction rate is measured by linear fitting of multiple absorbance readings vs time. Algorithms for automated estimation of the residence time, the linear range of the reaction curve, and data treatment are presented.

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.

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