Online spectrophotometric determination of Fe(II) and Fe(III) by flow injection combined with low pressure ion chromatography

Chen, Shujuan; Li, Nan; Xin-shen, Zhang; Yang, Dawei; Jiang, Heimei

doi:10.1016/j.saa.2014.11.071

Cited by 20 publications

(7 citation statements)

References 22 publications

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“…434 Recent years have brought several interesting applications of this methodology both in FIA and SIA systems, and many of them are broadly reported in the review papers. 71,73,75 In an FIA system with a laboratory-packed low-pressure cation exchange column, Fe(II) and Fe(III) were determined with spectrophotometric detection, 435 while in a multicommutated FIA system with UV detection, various commercial reversed-phase fused-core columns were examined for determination of alkylparabens. 436 In the results of very similar studies conducted in the SIA system, the same authors reported that with a fusedcore RP-amide column, much lower LOD values were obtained: 3.1 to 4.6 μg L −1 .…”

Section: Hyphenation Of Flow Injection Methods With High-performance ...mentioning

confidence: 99%

Recent advances in flow injection analysis

Trojanowicz

Kołacińska

2016

Analyst

159

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A dynamic development of methodologies of analytical flow injection measurements during four decades since their invention has reinforced the solid position of flow analysis in the arsenal of techniques and instrumentation of contemporary chemical analysis. With the number of published scientific papers exceeding 20,000, and advanced instrumentation available for environmental, food, and pharmaceutical analysis, flow analysis is well established as an extremely vital field of modern flow chemistry, which is developed simultaneously with methods of chemical synthesis carried out under flow conditions. This review work is based on almost 300 original papers published mostly in the last decade, with special emphasis put on presenting novel achievements from the most recent 2-3 years in order to indicate current development trends of this methodology. Besides the evolution of the design of whole measuring systems, and including especially new applications of various detections methods, several aspects of implications of progress in nanotechnology, and miniaturization of measuring systems for application in different field of modern chemical analysis are also discussed.

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Section: Hyphenation Of Flow Injection Methods With High-performance ...mentioning

confidence: 99%

Recent advances in flow injection analysis

Trojanowicz

Kołacińska

2016

Analyst

159

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“…It is possible to evaluate Fe(II) or Fe(III) ions with high sensitivity using an optical Phimhb sensor, according to LOD values (Table 1). When compared to the detection limits of other reagents or sensors [24,27–38] (based on colorimetric approach) previously reported for the determination of silver ions, the produced optical sensor has a very low detection limit (Table 2). The high sensitivity of the Phimhb sensor was judged by using nanomaterial (mesoporous silica nanospheres) as a carrier which improved the sensitivity of the immobilized reagents.…”

Section: Resultsmentioning

confidence: 99%

Development of a Sensitive and Selective Optical Sensor for Measuring Ultra‐Trace Amounts of Fe(II) and Fe(III) Ions in Water

Al‐Qahtani

Shah²,

Aljuhani³

et al. 2022

ChemistrySelect

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A smart spectrophotometric method for the analytical determination of iron concentration in whichever oxidation state was developed using a novel optical sensor. The optical sensor was prepared by direct immobilization of novel synthesized chromophore, 5‐(((1,10‐phenanthrolin‐5‐yl)imino)methyl)‐2‐hydroxybenzoic acid (Phimhb) onto mesoporous silica nanospheres (MSNSs). The novel Phimhb chromophore has two sites, one is selective to Fe(II) ions and the other is selective to Fe(III) ions. The ions′ color can be seen with the human eye and monitored using spectrophotometric techniques or a smartphone. The influence of several parameters on the evaluation of iron ions content was studied and optimized. The proposed method was validated in terms of LOD, LOQ, linearity, and precision according to ICH guidelines. The optical Phimhb sensor has wide linear dynamic ranges with low detection limits of 4.94 ppb (1.83×10−7 mol L−1) and 10.4 ppb (3.85×10−7 mol L−1) for Fe(II) and Fe(III), respectively. The response time of this sensor for both ions was 60 s. The Phimhb sensor could be reproduced multiple times and used with a higher capacity each time. The effect of potential interfering ions on the estimation of Fe(II) and Fe(III) was investigated. The outcomes clarified that the prepared Phimhb sensor was very selective to Fe(II) and Fe(III) ions. Therefore, the Phimhb sensor had been successfully used in the determination of Fe(II) and Fe(III) in real water even without any pre‐concentration, it has high specificity.

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“…The calculated limits of detection (LODs) using the two sensors were very low (0.026 ppm by using the 3-fsa-MSNT sensor and 0.023 ppm by using the 5-fsa-MSNT sensor). Consequently, it is possible to determine ultra-traces of Fe(III) ions using the two sensors with high sensitivity better than other spectrophotometric methods − as shown in Table . This may be attributed to the use of mesoporous silica nanotube nanomaterial as a carrier that boosted the sensitive property of the immobilized reagents (formylsalicylic acids), resulting in the high sensitivity of the 3-fsa-MSNT and 5-fsa-MSNT sensors. ,− It appears from Table that the 5-fsa-MSNT sensor has a lower LOD than the 3-fsa-MSNT sensor, and this may be because the positions of the hydroxyl and carboxylic groups are farther from the formyl group in the 5-fsa-MSNT structure than in the 3-fsa-MSNT structure.…”

Section: Results and Discussionmentioning

confidence: 99%

Spectrophotometric and Fluorometric Methods for the Determination of Fe(III) Ions in Water and Pharmaceutical Samples

2021

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Chemical sensors based on mesoporous silica nanotubes (MSNTs) for the quick detection of Fe(III) ions have been developed. The nanotubes’ surface was chemically modified with phenolic groups by reaction of the silanol from the silica nanotubes surface with 3-aminopropyltriethoxysilane followed by reaction with 3-formylsalicylic acid (3-fsa) or 5-formylsalicylic acid (5-fsa) to produce the novel nanosensors. The color of the resultant 3-fsa-MSNT and 5-fsa-MSNT sensors changes once meeting a very low concentration of Fe(III) ions. Color changes can be seen by the naked eye and tracked with a smartphone or fluorometric or spectrophotometric techniques. Many experimental studies have been conducted to find out the optimum conditions for colorimetric and fluorometric determining of the Fe(III) ions by the two novel sensors. The response time, for the two sensors, that is necessary to achieve a steady spectroscopic signal was less than 15 s. The suggested methods were validated in terms of the lowest limit of detection (LOD), the lowest limit of quantification (LOQ), linearity, and precision according to International Conference on Harmonization (ICH) guidelines. The lowest limit of detection that was obtained from the spectrophotometric technique was 18 ppb for Fe(III) ions. In addition, the results showed that the two sensors can be used eight times after recycling using 0.1 M EDTA as eluent with high efficiency (90%). As a result, the two sensors were successfully used to determine Fe(III) in a variety of real samples (tap water, river water, seawater, and pharmaceutical samples) with great sensitivity and selectivity.

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Online spectrophotometric determination of Fe(II) and Fe(III) by flow injection combined with low pressure ion chromatography

Cited by 20 publications

References 22 publications

Recent advances in flow injection analysis

Recent advances in flow injection analysis

Development of a Sensitive and Selective Optical Sensor for Measuring Ultra‐Trace Amounts of Fe(II) and Fe(III) Ions in Water

Spectrophotometric and Fluorometric Methods for the Determination of Fe(III) Ions in Water and Pharmaceutical Samples

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