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A rhodamine-benzimidazole conjugate(RB) as a probe was investigated.UV-Vis analysis showed that a strong absorption band at 552 nm was formed with the addition of Cu~(2+),while other transition metal ions induced a little more absorption.The absorption value of RB solution at 552 nm has a linear correlation with Cu~(2+) concentration between 35-70 μmol/L;the detection limit reached 6.82×10~(-2) μmol/L,which is lower than the settled limitation for copper in the drinking water(~30 μmol/L) standardized by World Health Organization(WHO).Moreover,FL analysis showed that only Fe~(3+) could induce large fluorescence intensity enhancement at 582 nm;other common metal ions including Cu~(2+) cannot induce the enhancement.There was a good linear correlation between relative fluorescence intensity and Fe~(3+) concentration ranging from 2 μmol/L to 20 μmol/L,and the detection limit reached1.70×10~(-2) μmol/L.The results showed that RB could detect Cu~(2+)and Fe~(3+) simultaneously,with the UV-Vis and fluorescence spectroscopy,respectively.
A-rhodamine-benzimidazole conjugate (RB) as a probe was investigated. UV-Vis analysis showed that a strong absorption band at 552 nm was formed with the addition of Cu ~ (2 +), while other transition metal ions induced a little more absorption The absorption value of RB solution at 552 nm has a linear correlation with Cu ~ (2+) concentration between 35-70 μmol / L; the detection limit reached 6.82 × 10 ~ (-2) μmol / L, which is lower than The settled limitation for copper in the drinking water (~ 30 μmol / L) standardized by World Health Organization (WHO). Moreover, FL analysis showed that only Fe 3+ could induce large fluorescence intensity enhancement at 582 nm; other common Metal ions including Cu ~ (2+) can not induce the enhancement. There was a good linear correlation between relative fluorescence intensity and Fe ~ (3+) concentration ranging from 2 μmol / L to 20 μmol / L, and the detection limit reached1. 70 × 10 ~ (-2) μmol / L.The results showed that RB could detect Cu 2+ and Fe 3+ simultaneously, with the UV-Vis and fluorescence spectroscopy, respectively.