▎ 摘　　要

NOVELTY - A microcystin-LR detecting method involves preparing graphene modified titanium dioxide nanotube arrays. The graphene modified titanium dioxide nanotube arrays is dropped with prepared microcystin-LR nucleic acid aptamer aqueous solution to obtain microcystin-LR photoelectrochemical fitness sensor, followed by preparing different concentrations of microcystin-LR standard solution, applying bias, measuring photocurrent, drawing standard working curve, adding the sample containing microcystin-LR, and determining microcystin-LR concentration of the sample by combining the standard working curve. USE - Method for detecting microcystin-LR in water. ADVANTAGE - The method enables detecting microcystin-LR with high detecting sensitivity and high selectivity, in simple manner. DETAILED DESCRIPTION - A microcystin-LR detecting method involves ultrasonically dispersing copper(II) sulfate pentahydrate in ascorbic acid in tetrahydrofuran solution A, placing titanium dioxide nanotube arrays in dispersed tetrahydrofuran solution A, reacting under the protection of nitrogen, washing and drying to obtain graphene modified titanium dioxide nanotube arrays electrode. The graphene modified titanium dioxide nanotube arrays is dropped with prepared microcystin-LR nucleic acid aptamer aqueous solution, allowed to stand at room temperature to obtain microcystin-LR photoelectrochemical fitness sensor, followed by preparing different concentrations of microcystin-LR standard solution by adding microcystin-LR photoelectrochemical fitness sensor as working electrode of the three-electrode system, applying bias at room temperature, measuring photocurrent in the visible light excitation using the I-t curve method, drawing standard working curve by the logarithm of the change of the photocurrent density and the microcystin-LR standard solution concentration, adding the sample containing microcystin-LR to the three-electrode system to measure the photocurrent density, and determining microcystin-LR concentration of the sample to be tested by combining the standard working curve.