Electrochemical behavior of metribuzin based on l-Norvaline modified electrode and its sensitive determination

•Determination of metribuzin was established with low detection limit.•The proposed method was also available to detect metribuzin in soil.•The reaction mechanism of metribuzin is for first time discussed in detail.•The electro-polymerization of L-Norvaline was investigated for the first time.

The electro-polymerization of l-Norvaline was investigated for the first time on glassy carbon electrode. The polymeric conditions and mechanism were discussed in detail. The electrochemical behaviors of metribuzin were studied systematically at this sensor and the dynamic parameters of electrode process were calculated. This electrochemical sensor, fabricated simply and very easy surface update, showed good response for metribuzin with a wide linear range from 6.43 × 10− 3 to 1.07 μg/mL and a low detection limit of 2.14 × 10− 3 μg/mL (S/N = 3). The proposed method was successfully applied to determine metribuzin in soil sample with satisfactory results. This work promoted the potential applications of amino acid materials in electrochemical sensors.

Graphical abstractCyclic voltammograms of (a) GCE in supporting electrolyte: 0.1 mol L− 1 B–R (pH 1.82)-blank voltammogram; scan rate: 100 mV s− 1; (b) GCE in metribuzin (10.71 μg/mL) solution; and (c) poly(l-Norvaline)/GCE in metribuzin (10.71 μg/mL) solution.Figure optionsDownload full-size imageDownload as PowerPoint slide