A tryptophan-containing fluoroionophore sensor with high sensitivity to and selectivity for lead ion in water

We report herein a fluoroionophore sensor derivated from tryptophan that shows high sensitivity ( detection limit up to 0.15 mu M) and specific selectivity for lead ion (Pb2+) over Ca2+, Cd2+, Co2+, Cr3+, Cu2+, K+, Mg2+, Na+, Fe2+, Mn2+, Ni2+ and Zn2+ in aqueous solution.