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Catalytic solid substrate–room‐temperature phosphorimetry detection for trace cadmium with Cd 2+ –3.5‐generation polyamidoamine dendrimer–Tween‐80 complex
Author(s) -
Liu JiaMing,
Wang HongXin,
Lin Liping,
Lin ShaoQin,
Lin Xuan,
Cai Wenlian,
Lin ChangQing,
Li ZhiMing
Publication year - 2011
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.1356
Subject(s) - phosphorescence , chemistry , dendrimer , detection limit , cadmium , catalysis , micelle , analytical chemistry (journal) , quenching (fluorescence) , substrate (aquarium) , filter paper , chromatography , fluorescence , polymer chemistry , organic chemistry , aqueous solution , physics , oceanography , quantum mechanics , geology
3.5‐Generation polyamidoamine dendrimers (3.5‐G‐D) emitted strong and stable room‐temperature phosphorescence (RTP) on filter paper when Pb 2+ was used as a heavy atom perturber. The RTP signal of 3.5‐G‐D was sharply enhanced upon the formation of 3.5‐G‐D–Tween‐80 micelle compound. The complex Cd 2+ –3.5‐G‐D–Tween‐80, generated in the coordination reaction between Cd 2+ and the tertiary amidocyanogen on the outer layer of 3.5‐G‐D in 3.5‐G‐D–Tween‐80 micelle compound, could catalyze KBrO 3 to oxidize 3.5‐G‐D in 3.5‐G‐D–Tween‐80, which caused the sharp quenching of the RTP signal of the system. The phosphorescence intensity change (Δ I p ) of the system had a linear relationship with the content of Cd 2+ . Thus a new catalytic solid substrate–room‐temperature phosphorimetry (SS‐RTP) for the determination of trace cadmium has been established. This highly selective and sensitive method has been applied to determine trace cadmium in biological samples with a limit of detection (LD) of 1.2 ag per spot (when the sample volume was 0.4 μL per spot, the corresponding concentration was 3.0 × 10 −15 g mL −1 ), the results agreeing with those obtained by atomic absorption spectrometry. The mechanism of catalytic SS‐RTP for the determination of trace cadmium was also discussed. Copyright © 2011 John Wiley & Sons, Ltd.