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A new voltammetric sensor based on poly(L-cysteine)/GR composite film modified electrode for the sensitive determination of amaranth in wastewater

ABSTRACT A simple voltammetric sensor was first constructed by dripping graphene (GR) on to the glass carbon electrode (GCE) and subsequently electro-polymerizing L-cysteine film. The sensor had a good voltammetric response to amaranth and linear in the range of 1.0 × 10−8–1.0 × 10−6 mol L−1. The detection limit of amaranth was 4.0 × 10−9 mol L−1 (S/N = 3). Using this method, we successfully obtained satisfactory results of amaranth in confectionery wastewater. This work promoted the potential applications of amino acid materials and GR in environmental pollution science. GRAPHICAL ABSTRACT