Potentiometric PVC-Membrane-Based Sensor for Dimethylamine Assessment Using A Molecularly Imprinted Polymer as A Sensory Recognition Element

Abstract

A new simple potentiometric sensor is developed and presented for sensitive and selective monitoring of dimethylamine (DMA). The sensor incorporates a molecularly imprinted polymer, with a pre-defined specific cavity suitable to accommodate DMA. The molecularly imprinted polymer (MIP) particles were dispersed in an aplasticized poly(vinyl chloride) matrix. The MIP is synthesized by using a template molecule (DMA), a functional monomer (acrylamide, AM), cross-linker (ethylene glycol dimethacrylate, EGDMA) and initiating reagent (benzoylperoxide, BPO). Using Trizma buffer solution (5 mmol L−1, pH 7.1), the sensor exhibits a rapid, stable and linear response for 1.0 × 10−5 to 1.0 × 10−2 mol L−1 DMA+ with a calibration slope of 51.3 ± 0.3 mV decade−1, and a detection limit of 4.6 × 10−6 mol L−1 (0.37 µg mL−1). The electrode exhibited a short response time (10 s) and stable potential readings (± 0.5 mV) for more than 2 months. Potentiometric selectivity measurements of the sensor reveal negligible interferences from most common aliphatic and aromatic amines. High concentration levels (100-fold excess) of many inorganic cations do not interfere. The sensor is successfully used for quantification of low levels of DMA down to 0.5 µg mL–1. Verification of the presented method was carried out after measuring the detection limit, working linearity range, ruggedness of the method, accuracy, precision, repeatability and reproducibility. Under flow-through conditions, the proposed sensor in its tubular form is prepared and introduced in a two-channel flow injection setup for hydrodynamic determination of DMA. The sampling rate is 50–55 samples h–1. The sensor is used to determine DMA in different soil samples with an accuracy range of 97.0–102.8%.

Electrochemical sensors based on molecularly imprinted polymers for the detection of chlorophenols as emergent distributing chemicals (EDCs): a review

“…62 MIP particles could also be immobilized using a polyvinyl chloride (PVC)-coated plastic membrane. [63][64][65] Numerous piezoelectric sensors and their applications in biological medium have been discussed in this fashion. 66 Unspe-cic adsorption was seen with electrochemical transduction.…”

Potentiometric determination of aliphatic amines by a synthetized allyltrifluoromethanesulfonyl imide ([C4H5O2F3NS]− ) cation exchanger

“…Despite our ability to detect TMA at low concentrations, continuously sensing and quantifying the gas concentration of TMA remains a challenge. LMW aliphatic amines are typically measured by encompass spectrophotometry [13], gas chromatography [14,15], high-performance liquid chromatography (HPLC) [16,17], capillary electrophoresis (CE) [18,19], and ion chromatography (IC) [20,21]. However, these methods are not cost-effective.…”