Design of a new flame-containing molecular emission cavity for speciation of sulfide, sulfite, sulfate, thiosulfate and thiocyanate in wastewater: catalytic behaviour of hydrogen ion

Doroodmand, Mohammad Mahdi; Shafiee, Zahra

doi:10.1080/03067319.2014.921294

Cited by 5 publications

(4 citation statements)

References 49 publications

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“…Detail of cavity ring down spectroscopy (CRDS) system is almost similar the molecular emission cavity analysis (MECA) system, described in the previous study [37]. In this experiment, some modifications are applied to the cavity in order to be used for phosphorous determination.…”

Section: Instrumentationmentioning

confidence: 96%

Aerosol Hygroscopic Growth as a New Factor for Trace and Ultra-Trace Determination of Phosphorous in Flame Containing Optical Trapping-Cavity Ring-Down Spectroscopy

Doroodmand¹,

Ghasemi²

2017

J Anal Bioanal Tech

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A new method has been introduced based on aerosol hygroscopic growth as a new factor for trace and ultra-trace determination of phosphorous in flame containing optical trapping-cavity ring down aerosol extinction (emission) spectrometer (OT-CRD-AES). In this study, a cavity ring down has been designed using hydrogen and air as fuel and oxidant during introduction of the aerosols containing phosphorous species using an ultrasonic generator (humidifier) from an acidic solution by a flow rate of N 2 , followed by detection of the Mie scattering using a charged coupling device (CCD) system. Parameters having strong influence during following scattering of the aerosols during their hygroscopic growth inside the humidified flame (H 2 /air), include: influence and amount of Na + as radiation buffer (as light source), flow rates of H 2 , air and N 2 , kind and concentrations of acid, evaluation of the aerosols inside flame, etc. These parameters were optimized using simplex and one at a time methods. Based on the figures of merit under optimized condition, two linear calibration curves with reverse slopes were evaluated between 10.0 -250.0 ng mL -1 and 1.0 -20.0 µg mL -1 with correlation coefficients (R 2 ) the same as 0.999 and 0.998, respectively. The calibration sensitivities were also estimated to 57.46 and 0.348 (a.u), respectively, with detection limit of 5.0 ng mL -1 . The mechanism of the radiation (Mie scattering) was also evidenced based on i) dependency of the scattered radiations to the quantity of an alkali ions such as Na+ as well as the humidity, ii) presence of acceptable correlation between the response of the cavity with turbidometry, iii) observation of blue shift from green (color related to the luminescence of HPO* in H 2 /air flame) to blue (scattered radiation) and finally iv) effect of hydration number during stability and growth of the aerosols inside the flames.No serious interference was evaluated during analysis of at least 500-fold excess of various foreign species. However, the only observed interference was evaluated during introduction of 200-fold excess of SO 4 2-. Good correlation was also evaluated between the results obtained from this technique and ion exchange chromatography during analysis of wastewater samples that clearly revealed the reliability of this method for phosphorous detection and determination at µg mL -1 and ng mL -1 levels.

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Section: Instrumentationmentioning

confidence: 96%

Aerosol Hygroscopic Growth as a New Factor for Trace and Ultra-Trace Determination of Phosphorous in Flame Containing Optical Trapping-Cavity Ring-Down Spectroscopy

Doroodmand¹,

Ghasemi²

2017

J Anal Bioanal Tech

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“…When compared to the analytical performance properties of the current VA-CPE method with those of other detection methods in literature such as LODs, linear working range, precision, preconcentration and sensitivity enhancement factors [4,5,13,14,30,32,33], except for IC method based on catalytic effect of thiosulfate onto photometric reaction between I 3 − and N 3 − at pH 5.0 [1] in Table 4, it shows many advantages such as simplicity, minimum solvent consumption, reasonable repeatability/reproducibility, a linear working range of 600-fold, a low detection limit with comparatively little interference with a highly good calibration sensitivity. IC as detection tool has disadvantages such as long analysis time (>15 min), expensive analysis equipment and chemicals, poor recovery due to peak tailing and/or peak overlapping especially at high concentrations, so as to lead to recalibration of instrument.…”

Section: Comparison Of the Va-cpe Methods With Other Methodsmentioning

confidence: 99%

“…Thiosulfate determination has been mostly performed using analytical techniques such as flame-containing molecular emission cavity analysis (MECA) [30], kinetic spectrophotometry [31], gas chromatography-mass spectrometry (GC-MS) [32], flame atomic absorption spectrometry (FAAS) [33], high-performance liquid chromatography (HPLC) [34], ion-pair chromatography with ultraviolet absorbance [35], ion chromatography (IC) based on isocratic elution with fluorescence detection [36] and inductively coupled plasma mass spectrometry (ICP-MS) [37]. Determination of thiosulfate via these methods is expensive, tedious and time-consuming as well as poor precision at low concentrations and requires expert user in her/his area.…”

Section: Introductionmentioning

confidence: 99%

Extraction, preconcentration and spectrophotometric determination of trace levels of thiosulfate in environmental waters

Gürkan

Altunay

Gürkan³

2017

J IRAN CHEM SOC

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are statistically in a good agreement with those obtained by DTNB method. Finally, the method developed was successfully applied to the preconcentration and determination of trace thiosulfate from environmental waters. Abstract In the existing study, a new vortex-assisted cloud point extraction (VA-CPE) method was developed for determination of low levels of thiosulfate in environmental waters at 632 nm by spectrophotometry. The method is selectively based on charge-transfer-sensitive ion-pair complex formation of Ag(S 2 O 3 ) 2 3− , which is produced by the reaction of thiosulfate with excess Ag + ions with toluidine blue (3-amino-7-dimethylamino-2-methylphenazathionium chloride, TB + ) and then its extraction into micellar phase of polyethylene glycol 4-tert-octylphenyl ether (Triton X-45) in presence of Na 2 SO 4 as salting-out agent at pH 7.0. All the factors affecting complex formation and VA-CPE efficiency were optimized in detail. Under the optimized conditions, the linear calibration curves for thiosulfate were in the range of 0.2-120 and 5-180 µg L −1 with sensitivity improvement of 81-folds and 15-folds, respectively, as a result of efficient mass transfer obtained by CPE with and without vortex, while it changed in the range of 260-3600 µg L −1 without preconcentration at 642 nm. The limits of detection and quantification of the method for VA-CPE were found to be 0.05 and 0.22 µg L −1 , respectively. The precision (expressed as the percent relative standard deviation) was in range of 2.5-4.8% (5, 10 and 25 µg L −1 , n: 5). The method accuracy was validated by comparing the results to those of an independent 5,5′-dithiobis(2-aminobenzoic acid) (DTNB) method as well as recovery studies from spiked samples. It has been observed that the results * Ramazan Gürkan Keywords

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“…[12][13][14][15][16] As a consequence, there is a growing interest in developing techniques for detecting S 2À ions, which has to be rapid, selective, and ultrasensitive. The qualitative as well as quantitative determination of S 2À can be done in a variety of ways, such as titrimetry, [17] flow-injection analysis, [18] inductively coupled plasma atomic emission spectroscopy, [19] hydride generation atomic fluorescence spectrometry, [20] electrochemical methods, [21] ion chromatography, [22] HPLC, [23] chemiluminescence, [24] colorimetry, [25] molecular emission cavity analysis, [26] and fluorimetry, [27] etc. These approaches, however, have several drawbacks, such as a long detection time, a high detection cost, and difficult modification processes.…”

Section: Introductionmentioning

confidence: 99%

Dye‐linked Upconverting Nanophosphor‐based Ratiometric Chemosensor for NIR‐excited and FRET‐mediated Ultrasensitive Detection of Sulfide Ions

Kumar

Roy

2023

ChemistrySelect

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In this article, a NIR-excited ratiometric method for selective and ultrasensitive detection of sulfide (S 2À ) ions in an aqueous environment is presented, which is reliant on fluorescence resonance energy transfer (FRET). The chemosensor-design is based on an upconverting nanophosphor (UCNP)-linked coloured complex between a rhodamine-B derivative and stannous ions (RBD-Sn 2 + ). Under the excitation of NIR light, the green emission of UCNP (at 542 nm) is reabsorbed by the linked RBD-Sn 2 + complex via FRET, which in turn emits in the orange (at 582 nm). S 2À ions specifically interact with the linked RBD-Sn 2 + complex and quantitatively bleach its colour, leading to reduction in FRET and consequent recovery of the green emission of UCNP. We investigated the quantitative and ratiometric detection of S 2À ions in aqueous phase using this NIR-excited FRET-based approach. The concentration of S 2À ions is quantitatively connected to the ratiometric emission signal under NIR excitation. We have found that the detection limit for S 2À ions using our FRET-based nanoprobe is around ten times lower than that of colorimetric or fluorescence-based approaches. Owing to the use of NIR-light as excitation source, our proposed sensor can demonstrate background-free sensing of S 2À in complex environmental and biological samples.

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Design of a new flame-containing molecular emission cavity for speciation of sulfide, sulfite, sulfate, thiosulfate and thiocyanate in wastewater: catalytic behaviour of hydrogen ion

Cited by 5 publications

References 49 publications

Aerosol Hygroscopic Growth as a New Factor for Trace and Ultra-Trace Determination of Phosphorous in Flame Containing Optical Trapping-Cavity Ring-Down Spectroscopy

Aerosol Hygroscopic Growth as a New Factor for Trace and Ultra-Trace Determination of Phosphorous in Flame Containing Optical Trapping-Cavity Ring-Down Spectroscopy

Extraction, preconcentration and spectrophotometric determination of trace levels of thiosulfate in environmental waters

Dye‐linked Upconverting Nanophosphor‐based Ratiometric Chemosensor for NIR‐excited and FRET‐mediated Ultrasensitive Detection of Sulfide Ions

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