Synthesis of a quinoxaline–hydrazinobenzothiazole based probe—single point detection of Cu 2+ , Co 2+ , Ni 2+ and Hg 2+ ions in real water samples

ions, respectively, were achieved using our sensor, which are below the US-EPA permissible limits. Additionally, the sensor was utilized for naked eye detection under normal daylight. Quantitative determination of the metal ions in real water samples was also demonstrated.