Determination of Fe(II) by Optimized Thermal Lens Microscope

Cabrera, Humberto; Korte, Dorota; Franko, Mladen

doi:10.1007/s10765-015-1933-0

Cited by 6 publications

(10 citation statements)

References 15 publications

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“…The achieved LOD is much lower compared to those achieved for spectrophotometric method (1.07 uM ; in 10 cm long sample cell), thermal lens microscopy (TLM) in batch mode (0.01uM ) and compared to values achieved by TLM-uFIA (36 nM). [23][24] The applicability of FIA-TLS technique was verified by determining iron species concentrations in a real freshwater sample from Vrtojbica creek. The concentration of iron in Vrtojbica creek was determined by the standard addition method.…”

Section: Resultsmentioning

confidence: 99%

Determination of Iron in Environmental Water Samples by FIA-TLS

Korte

Tomsič

Bratkič

et al. 2019

ACSi

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The determination of low concentration of iron in natural waters can be difficult due to the complexity of natural water, but primarily because it requires preconcentration of the sample with solvent extraction. In this work we report on results of thermal lens spectrometry (TLS) coupled to flow injection analysis (FIA) as a highly sensitive FIA-TLS method of iron detection. The concentration of iron redox species was determined using 1,10-phenanthroline (PHN), that forms stable complexes with Fe(II) ions which are characterized by an absorption maximum at 508 nm. The TLS system using a 633 nm probe laser and 530 nm pump laser beam was exploited for on-line detection in flow injection analysis, where a PHN solution was used as the carrier solution for FIA. The concentration of the complexing agent affects the quality of the TLS signal, and the optimal concentration was found at 1 mM PHN. The achieved limits of detection (LODs) for Fe(II) and total iron were 33 nM for Fe(II) and 21 nM for total iron concentration. The method was further validated by determining the linear concentration range, specificity in terms of analytical yield and by determining concentration of iron in a water sample from a local water stream.

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Section: Resultsmentioning

confidence: 99%

Determination of Iron in Environmental Water Samples by FIA-TLS

Korte

Tomsič

Bratkič

et al. 2019

ACSi

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“…Unfortunately, in the case of some environmental samples the concentration of trace metals may be so low, that the low detection limits (LOD) achieved by TLS are not always sufficient. Thus, some modifications of this technique were introduced [9][10][11][12][13][14][15]. The improvement of TLS involved new experimental setup configurations, as well as various samplemodification techniques to change the thermal and optical properties of the sampled material, thus improving the sensitivity of the method.…”

Section: Thermal Lens Microscope Sensitivity Enhancement Using a Pass...mentioning

confidence: 99%

“…The improvement of TLS involved new experimental setup configurations, as well as various samplemodification techniques to change the thermal and optical properties of the sampled material, thus improving the sensitivity of the method. Among them there are: modification of solution matrix [9], adding of organic solvents (such as acetonitrile, acetone or methanol [10]) to the sample solution to increase the photothermal effect, combining TLS mode mismatched configuration with conventional microscopy (thermal lens microscopy TLM) [11,12], the use of the Soret effect [13], introducing a three-layer system to enhance the detected signal [14] and the usage of long path cells [15]. However, the use of long path cells imposes a number of limitations, which have hindered its application as miniaturized optical devices for microsystems and integrated micro processing chemistry.…”

Section: Thermal Lens Microscope Sensitivity Enhancement Using a Pass...mentioning

confidence: 99%

Thermal lens microscope sensitivity enhancement using a passive Fabry–Perot-type optical cavity

et al. 2016

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We developed a thermal lens microscope equipped with a passive optical cavity, which provides an optical feedback for the multiple pass of the probe laser beam to enhance sensitivity. Considering the maximum absorption peak for Fe(II) at 532 nm wavelength, we have achieved a 6.6-fold decrease in the limit of detection (LOD) to a level of 0.077 μg • l −1 without a cavity. The possibilities to use thermal lens detection combined with an optical resonator was proposed and a drastic thermal lens signal enhancement was achieved using very low excitation power. The corresponding LOD for Fe(II) was further decreased to the level of 0.006 μg • l −1 which represents an 85-fold decrease of the LOD value. This setup is a promising device, which can be applied as a sensitive tool for detecting chemical traces in small volumes of solutions.

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“…At present, some determination methods of iron(II) and GA respectively have been reported. For example, the methods used to detect iron(II) include chemiluminescence, [7,8] liquid chromatography, [9] colorimetry, [3,10] spectrophotometric, [11][12][13] flame atomic absorption spectrometry, [14] photothermal effect, [15] fluorescence analysis [16][17][18] and so on. Analysis and determination methods of GA include flow injection chemiluminescent method, [19] spectrophotometric, [20][21][22] isocratic column liquid chromatography, [23] differential pulse polarography, [24] colorimetry, [6,25] electrochemical method based on molecularly imprinted polymers, [26] fluorescence, [27,28] voltammetric method, [29][30][31] etc.…”

Section: Introductionmentioning

confidence: 99%

A dual‐mode optical assay for iron(II) and gallic acid based on Fenton reaction

Ding

et al. 2022

Luminescence

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The hydroxyl radicals (·OH) produced by the Fenton reaction of iron(II) and hydrogen peroxide (H2O2) can oxidize the colorless 3,3′,5,5′‐tetramethylbenzidine (TMB) to blue oxidized TMB (Ox‐TMB), resulting in a decrease in the fluorescence intensity of the reaction system and an increase in ultraviolet absorption. Ox‐TMB had a visible absorption peak at 625 nm and a fluorescence peak around 420 nm. When gallic acid (GA) was added to the system, Ox‐TMB was reduced to TMB, which made the color of the system disappear and the fluorescence recover. The linear ranges for determination of iron(II) were 0.5–10 μM (fluorometric) and 0.5–20 μM (colorimetric), and the detection limits were 0.25 μM (fluorometric) and 0.28 μM (colorimetric). The linear ranges for determination of GA were 0–80 μM (fluorometric) and 0–60 μM (colorimetric), and the detection limits were 0.31 μM (fluorometric) and 0.8 μM (colorimetric). The results of anti‐interference experiments shew that this dual‐mode assay had very good selectivity for the determination of iron(II) and GA.

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Determination of Fe(II) by Optimized Thermal Lens Microscope

Cited by 6 publications

References 15 publications

Determination of Iron in Environmental Water Samples by FIA-TLS

Determination of Iron in Environmental Water Samples by FIA-TLS

Thermal lens microscope sensitivity enhancement using a passive Fabry–Perot-type optical cavity

A dual‐mode optical assay for iron(II) and gallic acid based on Fenton reaction

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