A colorimetric probe for the detection of hydrazine and its application.

A colorimetric probe was developed to detect N 2 H 4 content based on the colour change in natural light, and the recognition mechanism is the N 2 H 4 cutting the ester bond of probe 1. As the N 2 H 4 concentration increases, the Ultraviolet absorption ratio (A 352nm /A 505nm ) of the probe solution was gradually increases, and the colour of the solution changed from colourless to pink under natural light. The detection limit of probe 1 for N 2 H 4 was 0.1 μM. The probe can also be applied to test paper detection, and the test paper of probe was changed from colourless to fluorescent yellow under UV light as the concentration of N 2 H 4 increased. There was a linear functional relationship between the RGB (Red, Green, Blue) values of the photos and the N 2 H 4 concentration. Probe 1 is a rapid detection tool for N 2 H 4 concentration using a smartphone. Furthermore, the probe can also be used to detect N 2 H 4 in tap water, tea and apple juice.