Sequential Determination of Mono- and Divalent Copper in Water by Flow-Injection Analysis

2014 ◽  
Vol 161 (4) ◽  
pp. H183-H188 ◽  
Author(s):  
L. León ◽  
J. Carbajo ◽  
J. J. Maraver ◽  
J. D. Mozo
Keyword(s):  
Flow Injection ◽  
Flow Injection Analysis ◽  
Divalent Copper ◽  
Sequential Determination

scholarly journals Sequential Determination of Salicylic and Acetylsalicylic Acids by Amperometric Multisite Detection Flow Injection Analysis

2002 ◽  
Vol 85 (6) ◽  
pp. 1253-1259 ◽  
Author(s):  
Rita I L Catarino ◽  
M Beatriz Q Garcia ◽  
Rui A S Lapa ◽  
José L F C Lima ◽  
Enrique Barrado
Keyword(s):  
Salicylic Acid ◽  
Acetylsalicylic Acid ◽  
Flow Injection ◽  
Flow Injection Analysis ◽  
Pharmaceutical Products ◽  
Hydrodynamic Characteristics ◽  
Good Precision ◽  
Sequential Determination ◽  
Relative Standard

Abstract An amperometric multisite detection flow injection analysis (FIA) system was developed for sequential determination of 2 analytes with a single sample injection and single detector. Tubular composite carbon electrodes with an inner diameter similar to that of the FIA manifold tubing were constructed so that measurements could be made without impairing the sample plug hydrodynamic characteristics. The electrochemical behavior of the tubular voltammetric cell in a low-dispersion FIA manifold and the behavior of the FIA system incorporating this type of voltammetric cell intended for multisite detection were evaluated by performing measurements with potassium hexacyanoferrate(II). Feasibility of the approach was demonstrated in the sequential determination of salicylic and acetylsalicylic acids in pharmaceutical products at a fixed potential of 0.98 V. The system allows sequential determination of salicylic acid concentrations ranging from 1.0 × 10−5 to 5.0 × 10−5M and acetylsalicylic acid concentrations between 1.0 × 10−3 and 5.0 × 10−3M with good precision on both detection sites and with relative standard deviations (RSDs) ≥ 1.5% (n = 10) and 2.1% (n = 10), respectively. A comparison of these results with those of the U.S. Pharmacopeia procedure showed RSDs <5.0 and 1.0% for salicylic acid and acetylsalicylic acid, respectively. The proposed method enables 15 determinations per hour, which corresponds to the analysis of approximately 8 samples per hour. The detection limits of the methodology were approximately 3.5 × 10−6 and 1.1 × 10−5M, respectively, for the first and second monitoring sites.

scholarly journals A novel approach to non-segmented flow analysis: Part 3. Nitrate, nitrite and ammonium in waters

1988 ◽  
Vol 10 (4) ◽  
pp. 192-197 ◽  
Author(s):  
D. J. Malcolme-Lawes ◽  
C. Pasquini
Keyword(s):  
Flow Injection ◽  
Flow Injection Analysis ◽  
Continuous Flow ◽  
High Performance ◽  
Flow Analysis ◽  
Ammonium Ion ◽  
Sequential Determination ◽  
Novel Approach ◽  
Wide Range

A high-performance continuous-flow analyser is used for the analysis of nitrate, nitrite and ammonium ion in potable waters. The results demonstrate that (1) the analyser allows the sequential determination of a number of analytes without requiring modification to the manifold; (2) the use of programmed slicing of the reaction mixture allows a wide range of analyte concentrations to be handled; and (3) that the sensitivity achieved compares favourably with the best available from conventional flow-injection analysis. The limits of detection were found to be 5 ppb for NH4+, 30 ppb for NO3-, and 4 ppb for NO2-.

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