A Cu2+-specific reversible chemosensor capable of showing a naked eye detectable instant change in colour in the presence of as low as 30 ppb of Cu2+was designed. Utilizing brine shrimpArtemia, the LOD could be improved further to 10 ppb through bio-accumulation of Cu2+.
A new acyclic chemosensor bearing a siderophore linked to a rhodamine 6G fluorophore showed highly selective detection of Ca 2+ ions in 100% aqueous solution at pH 7.4. The probe showed bio-imaging applicability in the live animal Artemia .