Anodic Stripping Voltammetric Determination of Nitrite Using Carbon Paste Electrode Modified with Chitosan

Habib, I. H. I.

doi:10.4236/ajac.2011.22035

Cited by 9 publications

(2 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Chitosan has a high content of amino and hydroxyl functional groups which are essential for the adsorption and removal of aquatic pollutants [2]. The choice of chitosan as the adsorbent was due to its remarkable physico-chemical characteristics, chemical stability, high reactivity, excellent chelation behaviour and high selectivity toward many aquatic pollutants [3][4][5][6][7][8]. Although chitin can be used as biosorbent whose cost is lower than chitosan, the capacity of chitosan is five or six times greater than that of chitin due to its free amino and hydroxyl groups [9].…”

Section: Introductionmentioning

confidence: 99%

Study of Sorbsion Properties of Copper (Ii) Ion With Chitosan Based Sorbent

Mammadova¹,

Rajabli²,

Rahimli³

et al. 2023

AChJ

View full text Add to dashboard Cite

Over the past few decades, a significant increase in the use of heavy metals has led to an increase in the amount of metals in the aquatic environment. For living organisms, among heavy metals, copper (II) is one of the toxic metals and one of the most common environmental pollutants. Excessive concentrations of Cu2+ ions can cause various diseases and intoxications in humans. In this regard, the use of absorbents for the sorption of metals is both an economically and technologically efficient method. Quaternized natural polymer chitosan was used as a sorbent to study the sorption properties of copper (II) ion. During the research, the optimal conditions of the sorption process was determined, pH effect of the environment, initial concentration of the metal on the sorption process were studied. The sorption capacity of the synthesized sorbent towards the Cu (II) ion was studied and it was determined that the maximum sorption capacity equal to 255 mg/g was at pH=4. Moreover the influence of copper (II) ion concentration on the sorption process was studied. It was found that the sorption capacity and sorption degree of the sorbent increase with an increase in the concentration of the Cu2+ ion in the solution. It was determined that the maximum sorption capacity was 406 mg /g, which corresponds to the concentration of copper (II) ion, equal to 10∙10-2 mol/L. The results show that quaternized chitosan-based sorbent can be successfully used for the sorption of Cu (II) ion

show abstract

Section: Introductionmentioning

confidence: 99%

Study of Sorbsion Properties of Copper (Ii) Ion With Chitosan Based Sorbent

Mammadova¹,

Rajabli²,

Rahimli³

et al. 2023

AChJ

View full text Add to dashboard Cite

show abstract

“…The modified electrode's active surface area was electrically activated by immersion in 0.5 M HCl solution, followed by five cyclic voltammetric scans from -0.2 V to +1 V. This electrical activation led to the protonation of the amino (-NH 2 ) groups of chitosan to form 3 -NH + groups [40]. Cyclic voltammograms were recorded by transferring the chitosan-CPE either in a phosphate buffer (PB), HCl/KCl or in an acetate buffer (AB) solution containing MG at a given concentration.…”

Section: Electroanalytical Proceduresmentioning

confidence: 99%

Adsorptive Stripping Voltammetric Determination of Mangiferin Using an Activated Chitosan Modified Carbon Paste Electrode

Tchieno¹,

Njanja²,

Tapondjou³

et al. 2014

AJAC

View full text Add to dashboard Cite

A medium molecular weight powdered chitosan modified carbon paste electrode was used to investigate the electrochemical behaviour by cyclic voltammetry of the pharmacologically-active ingredient mangiferin (MG). An irreversible system was observed, with a peak at +0.55 V (vs Ag/AgCl). The peak current increases about fourfold, at the modified electrode in comparison with that recorded at the chitosan free carbon paste electrode. This allowed the use of adsorptive stripping voltammetry to develop a simple and sensitive electroanalytical method for the determination of MG. The influence of key parameters was investigated, including the electrolysis potential, the preconcentration time, the pH of supporting electrolyte and MG concentration. Upon optimisation of these parameters, the electrode response was found to be directly proportional to the concentration of MG in the range from 2.06 × 10 −6 M to 6.74 × 10 −5 M, leading to a detection limit of 1.84 μM for 240 s preconcentration at −0.1 V. A mechanism was also proposed for the electrochemical oxidation of MG.

show abstract