No abstract

The sensors in solutions and sensors encapsulated polymeric membranes exhibited high sensitivity and selectivity for Hg2+ detection, with detection limits of 0.2–49 ppb.

No abstract

No abstract

A "turn on" fluorescent sensor based on 2- [4-(2-aminoethylthio)butylthio]ethanamine ionophore and [5]helicene fluorophores, MC4 was developed for detection of Ag + . An aqueous ethanol solution, an environmental friendly condition, was chosen as a working condition. MC4 exhibited Ag + -induced fluorescent enhancement with a low detection limit of 32 ppb for Ag + . The detection limit of the sensor was below the permissible concentrations of Ag + for drinking water as regulated by the United States Environmental Protection Agency (U.S. EPA) and World Health Organization (WHO). Moreover, MC4 exhibited a strong fluorescent signal and expansive stokes shift of 213 nm. This very expansive stokes shift could reduce interferences from self-absorption and auto-fluorescence. The sensor also provided highly selective recognition of Ag + , distinguishing it from other competing ions through the photoinduced electron transfer (PET). Importantly, this sensor is able to track Ag + in HepG2 cells, indicating that it shows good potential for practical applications.