Square wave voltammetric detection by direct electroreduction of paranitrophenol (PNP) using an organosmectite film-modified glassy carbon electrode

Preparation of Organophilic Nanohybrid Kaolinite and Application to the Electrochemical Detection of Organic Pesticide

“…In‐depth analysis of this system shows that, on the second cyclic scan, a new reduction cathodic peak current (II c ) is observed in addition to the reduction peak current (I c ), which could correspond to the reversible reaction of the current of the anodic peak (II a ) centered at 0.3 V. When a potential sweep is performed from 0 and −0.4 V, it is found that the intensity of the peak currents in the reversible redox system decrease progressively until they disappear. This result is in agreement with those obtained in previous work , and shows that the reduction reaction corresponding to the peak current I c is responsible for the formation of peak currents II a and II c . The results described here are consistent with previous works reported on the electrochemical detection of MP and other compounds containing −NO 2 groups on an organoclay modified glassy carbon electrode .…”

“…This is owing to its high use in modern, intensive agriculture , with the global market for these pesticides now estimated at around 10 billion dollars . According to the European Union Directive, the pesticide concentration in drinking water must not exceed 0.1 ng.mL −1 for an individual compound and its degradation products, and 0.5 ng.mL −1 for the sum of all compounds . Pesticides are part of a large family of organic micropollutants (OMP).…”

“…Despite their sensitivity, these techniques have a number of disadvantages, such as poor selectivity, high cost of the equipment, and long analysis times . Electrochemical techniques are simple and inexpensive to implement, and can give very accurate results in a short amount of time . Depending on the nature of the reactions and the set of processes at the interface that lead to the detection of OMPs on the working electrode, biosensors and conventional electrochemical sensors can be used.…”

Nanohybrid materials from amine functionalization of sepiolite: Preparation, characterization and application as electrode modifiers for the electroanalytical detection of heavy metal ions

“…The resort to clays and clay minerals as inorganic parent support for such materials is due to their surface reactivity and ability to immobilize guest organic molecules, either within their structure or on their surface [1][2][3]. In fact, clay-based nanohybrid materials offer a wide range of applications in environmental protection [4][5][6][7][8], in catalysis [9][10], in polymer science [11][12] and in analytical electrochemistry [13][14][15][16]. In the last-mentioned application, composite materials derived from the modification of kaolinite [17][18] and smectite [19][20][21][22][23] as precursors are the most investigated, probably because these types of clay possess a layered structure favorable to intercalation processes and grafting reactions.…”

Atomic Emission Spectroelectrochemistryas A Sensitive Technique for Trace and Ultra-Trace Determination of Metal Species

“…According to the literature, different analytical methods such as atomic absorption/emission spectrometry (AAS/AES) [7,8] inductively coupled plasma (ICP) [9], molecular/atomic fluorescence spectrometry (MFE/AFS) [10], ion-exchange chromatography [11] as well as electrochemical techniques like potentiometry using ionselective electrodes [12,13], voltammetry [14] and electro analysis [15] [16] have been reported. However, these analytical techniques in spite of their advantages such as considerable sensitivity [17], occasionally suffer from problems including low improved detection limit, narrow linear range and/or chemical/optical interferences [17,18].…”