Heavy metal ions are one kind of main pollutants in the environment,which have caused great threat to human living conditions. With the rapiddevelopment of urban industrialization, life sewage and industry wastewater are drained into water environment. Heavy metal ions can beaccumulated into the human body through the food chain, leading a seriousthreat to people's health and life. Therefore, it is of great significance toestablish a simple, fast, sensitive method to detect them. Nucleic acids(ssDNA) with a...