Determination Of Hydroxylamine Research Articles

Kinetic Spectrophotometric Determination of Hydroxylamine and Nitrite Ion in a Mixture by Their Reactions with Neutral Red

Kinetic determination of hydroxylamine in soils by the initial rate method is based upon the reaction of neutral red with the nitrite ion, produced by oxidation of hydroxylamine with iodate in acidic media. The optimal conditions for determination are as follows: 0.3 mol L –1 H 2 SO 4 , 0.024 mol L –1 KIO 3 , 6.92×10 –5 mol L –1 neutral red. Hydroxylamine can also be determined in mixtures with nitrite ion, if the nitrite content has been found separately at the same conditions without iodate. The calibration graphs are linear in the range (3–27) μmol L –1 of NH 2 OH and (4–46) μmol L –1 of NO 2 – . The reproducibility errors are 3.3 % and 1.8%, the relative errors of determination prove to be 2.6 % and 2.1 %, for hydroxylamine and nitrite ion, respectively.

GC-MS determination of hydroxylamine in blood and urine

GC-MS determination of hydroxylamine in blood and urine

Electrochemical sensing of hydroxylamine using a wax impregnated graphite electrode modified with a nanocomposite consisting of ferric oxide and copper hexacyanoferrate

The authors describe a wax-impregnated graphite electrode modified with ferric oxide (Fe2O3) and copper hexacyanoferrate(II), and its application as an electrochemical sensor for hydroxylamine. The presence of Fe2O3 nanoparticles enhance the electron transfer kinetics and electrocatalytic activities, and also enlarge the surface area of the modified electrode. As compared to the unmodified electrode, 16.9 and 30.1 fold enhancements in amperometric response was observed for copper hexacyanoferrate(II) and the nanocomposite modified electrodes, respectively. Also, the presence of Fe2O3 in the nanocomposite enhances the anodic current response by 1.78 fold when compared to copper hexacyanoferrate(II) alone modified electrode. The electron transfer coefficient, electron transfer rate constant, diffusion coefficient and catalytic rate constant for the electro-oxidation of hydroxylamine were determined. Amperometry performed at a working voltage of 750 mV (vs. Ag/AgCl) revealed a detection range that extends from 0.8 μM to 100 μM, a detection limit of 0.5 μM (at an S/N ratio of 3) and a sensitivity of 0.0924 mA⋅mM−1. The modified electrode is remarkably stable and was successfully applied to the determination of hydroxylamine in spiked water samples.

Electrocatalytic Determination of Hydroxylamine in the Presence of Thiosulfate in Water and Wastewater Samples Using a Nanostructure Modified Carbon Paste Electrode

AbstractIn this research, we report the preparation of a high sensitive voltammetric sensor for electrocatalytic determination of hydroxylamine (HX) in the presence of thiosulfate (TS). We describe the synthesis and characterization of CdO nanoparticles (CdO/NPs) with transmission electron microscopy (TEM) and X‐ray diffraction (XRD) methods. At an optimum condition, the two peaks are separated ca. 0.58 and 0.92 V for HX and TS at the surface of the proposed sensor. Square wave voltammetry (SWV) of HX exhibited two linear dynamic ranges with a detection limit (3σ) of 0.06 µmol L−1. The propose sensor was used for determination of HX in water samples.

Synthesis of graphene oxide nanosheets and its application to construct a modified carbon paste electrode as a hydroxylamine electrochemical sensor

A ferrocene-derivative compound, 2, 7-bis (ferrocenyl ethynyl) fluoren-9-one (2,7-BFE), was synthesized and used to construct a modified graphene paste electrode. The electrooxidation of hydroxylamine at the surface of the modified electrode was studied using cyclic voltammetry (CV), chronoamperometry (CHA), and square wave voltammetry (SWV). Under the optimized conditions, the square wave voltammetric peak current of hydroxylamine increased linearly with hydroxylamine concentration in the range of 2.0 × 10−7 to 2.5 × 10−4 M and detection limit of 9.0 × 10−8 M was obtained for hydroxylamine. Finally, this modified electrode was used for determination of hydroxylamine in some water samples.

A sensitive electrochemical sensor for hydroxylamine determination: Using multiwall carbon nanotube paste electrode (MWCNTPE) and promazine hydrochloride as homogenous mediator

A sensitive electrochemical sensor for determination of hydroxylamine has been introduced. This sensor profits by promazine hydrochloride (PHC) as homogenous mediator and multiwall carbon nanotubes to improve the surface of carbon paste electrode as working electrode. Cyclic voltammetry (CV), linear sweep voltammetry (LSV), chronoamperometry, and differential pulse voltammetry (DPV) are used to study of the suitability of promazine hydrochloride, at the surface of multiwall carbon nanotube paste electrode (MWCNTPE), as a homogenous mediator for the electrocatalytic oxidation of hydroxylamine in aqueous solutions. Hydroxylamine hardly oxidizes at about +1.1V at the carbon paste electrode (CPE), whereas catalytically oxidizes in presence of PHC as mediator at the MWCNTPE. The electrocatalytic peak current of hydroxylamine oxidation shows a linear dependence on hydroxylamine concentration in the range of 0.008–0.100μM, by DPV in optimized conditions at pH 9.0. In addition, using LSV and in same conditions calibration plot was obtained at hydroxylamine concentration in the range of 0.17–10.0mM. The detection limit (3σ) was obtained 1.4nM and 4.2μM for DPV and LSV, respectively. Also, sensitivity in the DPV measurement was 476μA/μM. Kinetic parameters such as electron transfer coefficient, α and diffusion coefficient, D, are also determined. The proposed method was successfully applied as a highly sensitive, selective, simple, and precise method for hydroxylamine determination in the real samples.

Simultaneous Determination of Hydroxylamine, Phenol and Sulfite in Water and Waste Water Samples Using A Voltammetric Nanosensor

Simultaneous Determination of Hydroxylamine, Phenol and Sulfite in Water and Waste Water Samples Using A Voltammetric Nanosensor

Voltammetric determination of hydroxylamine in water and waste water samples using a NiO nanoparticle/new catechol derivative modified carbon paste electrode

A (9,10-dihydro-9,10-ethanoanthracene-11,12-dicarboximido)-4-ethylbenzene-1,2-diol (DED) modified NiO/NPs carbon paste electrode “(DED/NiO nanoparticle (NiO/NPs)/CPE) was constructed for determination of hydroxylamine (HX). The cyclic voltammogram showed that the electrocatalytic oxidation of HX at the surface of DED/NiO/NPs/CPE occurs at a potential of about 800 mV less positive than with an unmodified electrode. Square-wave voltammetry results presented that the electrocatalytic oxidation peak currents of HX in pH 8.0 had two linear dynamic ranges in the range of 0.1 to 2.0 and 2.0 to 400.0 µM HX, with a detection limit of 0.07 µM. The kinetic parameters such as electron transfer coefficient (0.47) and rate constant (2.454 × 10 3 M -1 s -1 ) were determined for the chemical reaction between HX and DED. Finally, this method was evaluated for the determination of HX in water and waste water samples.

Simultaneous determination of hydroxylamine and phenol using a nanostructure-based electrochemical sensor.

The electrochemical oxidation of hydroxylamine on the surface of a carbon paste electrode modified with carbon nanotubes and 2,7-bis(ferrocenyl ethyl)fluoren-9-one is studied. The electrochemical response characteristics of the modified electrode toward hydroxylamine and phenol were investigated. The results showed an efficient catalytic activity of the electrode for the electro-oxidation of hydroxylamine, which leads to lowering its overpotential. The modified electrode exhibits an efficient electron-mediating behavior together with well-separated oxidation peaks for hydroxylamine and phenol. Also, the modified electrode was used for determination of hydroxylamine and phenol in some real samples.

Hydroxylamine Electrochemical Sensor Based on a Modified Carbon Nanotube Paste Electrode: Application to Determination of Hydroxylamine in Water Samples

Hydroxylamine Electrochemical Sensor Based on a Modified Carbon Nanotube Paste Electrode: Application to Determination of Hydroxylamine in Water Samples

A highly sensitive method for the determination of hydroxylamine in soils

Hydroxylamine (HA) is a crucial intermediate in the first step of nitrification, i.e., the oxidation of ammonium to nitrite. Due to its reactivity, HA may play a key role in soil N2O emission. To determine soil HA concentrations and to explore the correlation between soil HA concentrations and N2O emission rates, we developed a novel, extremely sensitive method based on fast extraction of HA from the soil at pH1.7, oxidation of HA to N2O with Fe3+ and analysis of the N2O with gas chromatography (GC). The new method was tested on soil samples from a temperate Norway spruce forest, comparing soil HA concentrations with N2O emission rates determined with microincubations of the soil samples in GC vials. Our results demonstrate that the new GC method is extremely sensitive, being able to detect soil HA contents as low as 0.3μgNkg−1 dry soil. HA content in the forest soil samples ranged between 0.3 and 34.8μgNkg−1 dry soil. Moreover, N2O emission rates were significantly correlated with soil HA content (r2=0.80), suggesting a key role of HA in N2O formation under aerobic conditions.

Fabrication of an Amperometric Sensor for Hydroxylamine Based on Silver Paste Nanocomposite Electrode

Electrocatalytic oxidation of hydroxylamine (NH2OH) was investigated at silver (Ag) paste nanocomposite electrode. This electrode is a very good alternative for hydroxylamine determination compared with previously described electrodes because the electrocatalytic effect was achieved without any electrode modification. NH2OH was determined over a wide linear concentration range of 1.0 μM-5.0 mM with double potential step amperometry. The limit of detection was obtained as 0.3 μM. This new method of NH2OH determination is reproducible, selective, sensitive, and can be used for real sample analysis. The independence of the system from most of the interferences is the other advantageous feature of this sensor.

Electrosynthesis and electrochemical characteristics of 2,2′-(4,5-dihydroxy-3-methoxy-1,2-phenylene)bis(3-oxo-3-phenylpropanenitrile): application as a mediator for determination of hydroxylamine at a carbon nanotube modified electrode surface

Electrosynthesis and electrochemical characteristics of an electrodeposited DMPP film on a multi-wall carbon nanotube modified glassy carbon electrode and its role as a mediator for electrocatalytic oxidation of hydroxylamine.

Voltammetric determination of hydroxylamine in water samples using a 1-benzyl-4-ferrocenyl-1H-[1,2,3]-triazole/carbon nanotube-modified glassy carbon electrode

A modified glassy carbon electrode has been constructed using a 1-benzyl-4-ferrocenyl-1H-[1,2,3]-triazole along with multiwalled carbon nanotubes. The electrochemical behaviour of modified electrode has been investigated by cyclic voltammetry. Electrocatalytic activity of the modified electrode was investigated for the oxidation of hydroxylamine in 0.1 M phosphate-buffered solution of pH 8. The modified electrode showed electrocatalytic response to the oxidation of hydroxylamine at the potential of 330 mV. The linear range and detection limit for the detection of hydroxylamine in the optimum condition were found to be 4.0 × 10−7 to 6.75 × 10−4 M and 28.0 ± 1.0 nM, respectively. Finally, the method was employed for the determination of hydroxylamine in water samples.

Simultaneous detection of hydroxylamine and phenol using p-aminophenol-modified carbon nanotube paste electrode

A carbon paste electrode that was chemically modified with multiwall carbon nanotubes and p -aminophenol was used as a selective electrochemical sensor for the simultaneous detection of hydroxylamine (HX) and phenol. Cyclic voltammetry, double potential-step chronoamperometry, square wave voltammetry (SWV), and electrochemical impedance spectroscopy were used to investigate the use of p -aminophenol in the carbon nanotubes paste matrixes as a mediator for the electrocatalytic oxidation of HX and phenol in aqueous solution. The coefficient of electron transfer and catalytic reaction rate constant were determined using the electrochemical methods. Under optimized conditions, the electrocatalytic oxidation current peaks for HX and phenol increased linearly with concentration in the range of 0.5–180.0 and 10.0–650.0 μmol/L for HX and phenol, respectively. The detection limits for HX and phenol were 0.15 and 7.1 μmol/L, respectively. The anodic potential peaks of HX and phenol were separated by 0.65 V in SWV. Because of good selectivity and sensitivity, the present method provides a simple method for the selective detection of HX and phenol in practical samples such as water samples. A carbon paste electrode chemically modified with multiwall carbon nanotubes and p -aminophenol was prepared and used as a selective electrochemical sensor for the simultaneous determination of hydroxylamine and phenol in water samples.

A Novel Sensor of Quinazolin Derivative Self-Assembled Monolayers over Silver Nanoparticles for the Determination of Hydroxylamine

A Novel Sensor of Quinazolin Derivative Self-Assembled Monolayers over Silver Nanoparticles for the Determination of Hydroxylamine

Electrochemical Behavior of a Thio-Quinazoline Derivative Electrodeposited on a Glassy Carbon Electrode Modified with Multi-Wall Carbon Nanotubes: Application for Simultaneous Determination of Hydroxylamine and Nitrite

Electrochemical Behavior of a Thio-Quinazoline Derivative Electrodeposited on a Glassy Carbon Electrode Modified with Multi-Wall Carbon Nanotubes: Application for Simultaneous Determination of Hydroxylamine and Nitrite

A new strategy for determination of hydroxylamine and phenol in water and waste water samples using modified nanosensor

A carbon paste electrode modified with p-chloranil and carbon nanotubes was used for the sensitive and selective voltammetric determination of hydroxylamine (HX) and phenol (PL). The oxidation of HX at the modified electrode was investigated by cyclic voltammetry (CV), chronoamperommetry, and electrochemical impedance spectroscopy. The values of the catalytic rate constant (k), and diffusion coefficient (D) for HX were calculated. Square wave voltammetric peaks current of HX and PL increased linearly with their concentrations at the ranges of 0.1-172.0 and 5.0-512.0μmolL(-1), respectively. The detection limits for HX and PL were 0.08 and 2.0μmolL(-1), respectively. The separation of the anodic peak potentials of HX and PL reached to 0.65V, using square wave voltammetry. The proposed sensor was successfully applied for the determination of HX and PL in water and wastewater samples.

Application of Co(ii) complex multi-wall carbon nanotube modified carbon paste electrodes for electrocatalytic determination of hydroxylamine

Download options Please wait... Supplementary files Supplementary information PDF (1438K) Article information DOI https://doi.org/10.1039/C3AY40993G Article type Paper Submitted 17 Jun 2013 Accepted 18 Sep 2013 First published 19 Sep 2013 Download Citation Anal. Methods, 2013,5, 6649-6655 BibTex EndNote MEDLINE ProCite ReferenceManager RefWorks RIS Permissions Request permissions Application of Co(II) complex multi-wall carbon nanotube modified carbon paste electrodes for electrocatalytic determination of hydroxylamine A. Benvidi, P. Kakoolaki, A. R. Gorji, M. Mazloum-Ardakani, H. R. Zare and R. Vafazadeh, Anal. Methods, 2013, 5, 6649 DOI: 10.1039/C3AY40993G To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page. If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given. If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page. Read more about how to correctly acknowledge RSC content. Social activity Tweet Share Search articles by author Ali Benvidi Parisa Kakoolaki Ali R. Gorji Mohammad Mazloum-Ardakani Hamid R. Zare Rasoul Vafazadeh

Electrocatalytic Oxidation of Hydrazine and Hydroxylamine by Graphene Oxide-Pd Nanoparticle-Modified Glassy Carbon Electrode

Pd nanoparticle catalysts supported by thiolated graphene oxide (tGO) on a glassy carbon electrode (GCE), and denoted as tGO-Pd/GCE, are used in this study for the electrochemical determination of hydroxylamine and hydrazine. The physicochemical properties of tGO-Pd were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). They showed strong catalytic activity toward the oxidation of hydroxylamine and hydrazine. Cyclic voltammetry (CV) and amperometry were used to characterize the sensors' performances. The detection limits of hydroxylamine and hydrazine by tGO-Pd/GCE were 0.31 and 0.25 microM (s/n = 3), respectively. The sensors' sensitivity, selectivity, and stability were also investigated.