Speciation determination of aluminium (Al3+) by flow injection amperometry via the 1,2-dihydroxyanthraquinone-3-sulfonic acid complex

AbstractA highly sensitive and very simple spectrophotometric flow-injection analysis (FIA) method for the determination of iron(III) at low concentration levels is presented. The method is based on the measurement of absorbance intensity of the red complex at 410 nm formed by iron(III) and diphenylamine-4-sulfonic acid sodium salt (DPA-4-SA). It is a simple, highly sensitive, fast, and low cost alternative method using the color developing reagent DPA-4-SA in acetate buffer at pH 5.50 and the flow-rate of 1 mL min−1 with the sample throughput of 60 h−1. The method provided a linear determination range between 5 μg L−1 and 200 μg L−1 with the detection limit (3S) of 1 μg L−1 of iron(III) using the injection volume of 20 μL. FIA variables influencing the system performance were optimized. The amount of iron(III) and total iron in river and seawater samples was successfully determined. Repeatability of the measurements was satisfactory at the relative standard deviation of 3.5 % for 5 determinations of 10 μg L−1 iron(III). The accuracy of the method was evaluated using the standard addition method and checked by the analysis of the certified material Std Zn/Al/Cu 43 XZ3F.

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The determination of Cu, Ni, and Co using 2-(2-pyridylazo)-1-naphtol-4-sulfonic acid by multicomponent flow injection analysis (MC-FIA)

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19881162 ◽

1988 ◽

Vol 53 (6) ◽

pp. 1162-1171 ◽

Cited By ~ 3

Author(s):

Petr Doležel ◽

Vlastimil Kubáň

Keyword(s):

Flow Injection ◽

Flow Injection Analysis ◽

Sulfonic Acid ◽

Rapid Determination ◽

Reverse Flow ◽

Analytical Signal ◽

Ternary Mixtures ◽

The Individual ◽

Reverse Flow Injection Analysis

2-(2-Pyridylazo)-1-naphthol-4-sulfonic acid (1PAN4S) was used to develop a method for the simultaneous spectrophotometric determination of Cu(II), Ni(II), and Co(III) by reverse flow injection analysis (FIA) using a multichannel UV-VIS detector with a diode array. The method can be used to determine the individual ions in the range 5-50 μmol dm-3 Ni(II) or Cu(II) and 5-60 μmol dm-3 Co(III) in binary and ternary mixtures at ratios of 1 : 1 to 1 : 10 with a maximal relative deviation of units of per cent for the major components and tens of per cent for the minor components. The precision and accuracy of the determination are the same or slightly worse than for stationary measurements with half to one fifth the sensitivity. Measurement of the absorption spectra for the maximum analytical signal in digital form for c(1PAN4S) = 0·12 mmol dm-3, c(NaIO4) = 1·2 mmol dm-3 in 0·2M acetate buffer medium at pH 5·00 permits rapid determination (15 s per sample) of all the components using a simple program for multicomponent analysis in "overdetermined" systems.

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A.C. Oscillopolarographic Determination of Aluminum in Natural and Drinking Waters Using the Adsorption of the Al(III)-1,2-Dihydroxyanthraquinone-3-sulfonic Acid Complex

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19961745 ◽

1996 ◽

Vol 61 (12) ◽

pp. 1745-1753 ◽

Cited By ~ 8

Author(s):

Shuping Bi ◽

Zhengjiang Zhang

Keyword(s):

Drinking Water ◽

Sulfonic Acid ◽

Aluminum Concentration ◽

Buffer Solution ◽

Acid Complex ◽

Fast Determination ◽

Drinking Waters ◽

Relative Standard ◽

Drinking Water Samples

This paper presents a very simple and rapid method for determination of aluminum in natural and drinking waters by using a.c. oscillopolarographic adsorptive wave of the Al(III)-1,2-dihydroxyanthraquinone-3-sulfonic acid complex in a triethanolamine buffer solution of pH 7.6 at HMDE. A linear dependence between the incision height on dE/dt-E oscillogram and the aluminum concentration was obtained in the range from 5 . 10-6 to 5 . 10-5 mol l-1. The detection limit is 1 . 10-6 mol l-1 and the relative standard deviation is 6.0% for 4 . 10-5 mol l-1 aluminum. This method has the distinct advantages of cheap instrumentation, simple and rapid manipulation and deaeration is unnecessary. It is especially suitable for the fast determination of aluminum in natural and drinking water samples.

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Flow-injection determination of boric acid concentration with conductometric detection

Industrial laboratory Diagnostics of materials ◽

10.26896/1028-6861-2018-84-12-20-24 ◽

2018 ◽

Vol 84 (12) ◽

pp. 20-24

Author(s):

V. S. Gursky ◽

E. Yu. Kharitonova

Keyword(s):

Boric Acid ◽

Flow Injection ◽

Nuclear Power ◽

Sample Volume ◽

Primary Circuit ◽

Acid Complex ◽

Donnan Dialysis ◽

Fixed Sample ◽

Conductometric Detection

The flow-injection determination of boric acid with conductometric detection in technological environments of the primary circuit of WWER-type nuclear power plant is described. The method consists in periodical dosing a fixed sample volume into the flow of the mannitol solution. As a of the Formation of an anionic boric acid complex with mannitol and equivalent amount of hydroxonium ions, results in an abrupt increase in the electrical conductivity, which is recorded by a conductometric detector. The hydraulic and measuring circuits of the analyzer are implemented using standard ionochromatographic equipment. It is shown than in the concentration range of the analyte 1 – 16 g/liter, the correcting additives of ammonium and potassium hydroxides do not interfere with the results of the analysis. To eliminate the interfering effect of correcting additives at low concentrations of boric acid (0.2 – 1.0 g/liter) we propose to use a Donnan dialysis through a cation exchange membrane. Optimal conditions of the analysis are specified and the metrological characteristics are determined. At a concentration of boric acid of 0.2 g/liter, the standard deviation does not exceed 2%.

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