Simple and Selective Spectrophotometric Method for the Determination of Iron (III) and Total Iron Content, Based on the Reaction of Fe(III) with 1,2-Dihydroxy-3,4-Diketocyclo-Butene (Squaric Acid)

A simple and rapid spectrophotometric method for the determination of iron in environmental, biological, pharmaceutical, food and soil samples using 1,2-dihydroxybenzene-3,5-disulfonic acid

“…Compared with the other methods in the literature [13][14][15][16][17][18] the proposed method has several remarkable analytical characteristics:…”

“…1,2-dihydroxy-benzene-3,5-disulfonic acid (Tiron) (Scheme 1) has not previously been used for the spectrophotometric determination of iron. The method possesses distinct advantages over existing methods [13][14][15][16][17][18] with respect to sensitivity, selectivity, range of determination, simplicity, speed, pH/acidity range, thermal stability, accuracy, precision, and ease of operation. A comparison between existing methods [13][14][15][16][17][18] and the present method is shown in Table 1.…”

“…The method possesses distinct advantages over existing methods [13][14][15][16][17][18] with respect to sensitivity, selectivity, range of determination, simplicity, speed, pH/acidity range, thermal stability, accuracy, precision, and ease of operation. A comparison between existing methods [13][14][15][16][17][18] and the present method is shown in Table 1. The method is based on the reaction of non-absorbent tiron in a slightly acidic solution (2×10 -6 -2×10 -5 mol/L H2SO4) with iron(III) to produce a highly absorbent navy-blue chelate product followed by a direct measurement of the absorbent in an aqueous solution.…”

Determination of Trace Amounts of Total Fe as Fe(II) in Environmental Samples by Catalytic Kinetic Spectrophotometry

“…There are a number of sensitive analytical methods for a highly sensitive method for quantitative analysis of iron speciation in environmental and biomedical studies [9]. These methods include spectrophotometry [10][11][12][13], flourimetry [14], flow-injection analysis [15][16][17], voltammetry [18], chemiluminescence [19], capillary electrophoresis [20], atomic emission and atomic absorption spectrometry [21,22], and chromatography [23]. Although some of these methods are highly sensitive, they have disadvantages such as the necessity for expensive and sophisticated instrumentation and can only be used to determine iron (III) and/or total iron content.…”

Spectrophotometric Determination of Trace Iron by Using Its Catalytic Effect on the N-Phenylanthranilic Acid-Potassium Periodate Reaction

“…At present some of the most commonly used methods include spectrophotometry, [3][4][5] chemiluminescence, 6,7 fluorescence analysis, 8 polarographic and voltammetric analysis, 9,10 flow-injection analysis, 6,[11][12][13] atomic emission and atomic absorption spectrometries [14][15][16] and others. 17,18 Various kinetic methods based on the catalytic action of iron on the oxidation of organic compounds have been reported in several reviews [19][20][21] and original papers.…”