A highly selective molecularly imprinted electrochemiluminescence sensor for ultra-trace beryllium detection.

A new molecularly imprinted electrochemiluminescence (ECL) sensor was proposed for highly sensitive and selective determination of ultratrace Be(2+) determination. The complex of Be(2+) with 4-(2-pyridylazo)-resorcinol (PAR) was chosen as the template molecule for the molecularly imprinted polymer (MIP). In this assay, the complex molecule could be eluted from the MIP, and the cavities formed could then selectively recognize the complex molecules. The cavities formed could also work as the tunnel for the transfer of probe molecules to produce sound responsive signal. The determination was based on the intensity of the signal, which was proportional to the concentrations of the complex molecule in the sample solution, and the Be(2+) concentration could then be determined indirectly. The results showed that in the range of 7×10(-11 )mol L(-1) to 8.0×10(-9) mol L(-1), the ECL intensity had a linear relationship with the Be(2+) concentrations, with the limit of detection of 2.35×10(-11) mol L(-1). This method was successfully used to detect Be(2+) in real water samples.