▎ 摘　　要

4-hydroxy-3-nitrophenylarsonic acid (HNPA) is an organoarsenic drug commonly known as roxarsone, which has been intensively used as a feed additive in poultry industries. However, the HNPA can easily degrade into highly toxic inorganic arsenic poisoning in biotic and abiotic nature, which threatens human health and the environ-ment. Along with various conventional techniques, the electrochemical sensor based on nanomaterials has emerged as a potential tool for analyzing organoarsenic chemicals, owing to its ease of operation and accuracy. Herein, for the first time, we report the efficient and tremendously sensitive perovskite-structured ZnSnO3@GO nanocomposites for the electrochemical analysis of HNPA. The as-prepared ZnSnO3@GO nanocomposites with good chemical stability, excellent electron mobility, and larger specific area are beneficial to the HNPA reduc-tion. In addition, the analytical performance of the developed sensor shows the minimized reduction potential of (-0.63 V vs Ag/AgCl) with an admirable linear range of 0.01-453.4 mu M and a lower detection limit of 0.0043 mu M toward HNPA detection. Finally, the real sample analysis of the developed sensor was quantified in the chicken and soil samples, which exhibits appreciable accuracy. The developed ZnSnO3@GO/GCE provides a powerful tool for the rapid and sensitive detection of HNPA in actual samples.