Catalytic solid substrate-room-temperature phosphorimetry detection for trace cadmium with Cd2+ -3.5-generation polyamidoamine dendrimer-Tween-80 complex.
3.5-Generation polyamidoamine dendrimers (3.5-G-D) emitted strong and stable room-temperature phosphorescence (RTP) on filter paper when Pb2+ 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 Cd2+ -3.5-G-D-Tween-80, generated in the coordination reaction between Cd2+ and the tertiary amidocyanogen on the outer layer of 3.5-G-D in 3.5-G-D-Tween-80 micelle compound, could catalyze KBrO3 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 (ΔI(p) ) of the system had a linear relationship with the content of Cd2+. 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.
Department of Chemistry and Environmental Science, Zhangzhou Normal College, Zhangzhou, 363000, People's Republic of China. zzsyliujiaming@163.com
Jia-Ming
JM
Liu
Hong-Xin
HX
Wang
Li-Ping
LP
Lin
Shao-Qin
SQ
Lin
Xuan
X
Lin
Wen-Lian
WL
Cai
Chang-Qing
CQ
Lin
Zhi-Ming
ZM
Li
D002104:Cadmium / Q000737:chemistry*; D002384:Catalysis; D050091:Dendrimers / Q000737:chemistry*; D057230:Limit of Detection; D008163:Luminescent Measurements / Q000379:methods*; D011073:Polyamines / Q000737:chemistry*; D011136:Polysorbates / Q000737:chemistry*; D013696:Temperature
D050091:Dendrimers; C531249:Poly(amidoamine); D011073:Polyamines; D011136:Polysorbates; D002104:Cadmium