Highly sensitive detection of 4-NP in real water with long stability and high anti-inteference ability based on GO-Ag2CrO4/GCE

GO-Ag2CrO4 composites were facilely synthesized by precipitation method in this study. GO-Ag2CrO4 composites were used to modify glassy carbon electrode and exhibited enhanced electrochemical response toward 4-NP. The optimal GO weight percentage was determined as 10% (The related modified electrode denoted as 10% GO-Ag2CrO4/GCE). Based on 10%GO-Ag2CrO4/GCE, a highly sensitive and selective voltammetric method was developed to detect 4-NP. The electrode can response to 4-NP with a good linear relationship in a wide range of 1.43 to 396.83 mu mol/L. The determination limit (S/N = 3) is 0.095 mu M, which is significantly lower than the permitted limits of 4-NP in water. The anti-interference ability, reproducibility and stability of 10%GO-Ag2CrO4/GCE were evaluated in details. Furthremore, the practical application of 10%GO-Ag2CrO4/GCE was tested by detecting 4-NP in actual water bodies. 10%GO-Ag2CrO4/GCE exhibits low detecting limit, high anti-interference ability, good reproducibility and stability, and high performance in actual water detection, which indicates it is a highly potential sensing platform for trace 4-NP detection. (C) 2019 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.