title: Solid substrate-room temperature phosphorescence method for the determination of trace Mn(II) based on oxidizing reaction of hydrogen peroxide using alpha,alpha'-bipyridine as sensitizer.
abstract: A new solid substrate-room temperature phosphorescence (SS-RTP) method for the determination of trace manganese (II) has been established. It bases on the fact that fullerol (R) emits strong and stable room temperature phosphorescence (RTP) on filter paper substrate. H2O2 can oxidize R to cause the SS-RTP quenching. But manganese (II) can obstruct H2O2 to oxidize R, and enhance the RTP of R. alpha,alpha'-Bipyridine (Bipy) can sensitize the RTP. After adding Bipy, the DeltaI(p) enhances 7 times than that without Bipy. Under the optimum conditions, the linear dynamic range of this method is 0.016-1.12 pg spot(-1) with a detection limit (L.D.) of 4.6 fg spot(-1) (m(Mn(2+) is the absolute mass of Mn(2+)), and the regression equation of working curve is DeltaI(p)=25.20 + 63.55 m(Mn(2+) (pg spot(-1)), n=6, r=0.9983. For 0.016 and 1.12 pg spot(-1) Mn(2+), RSDS are 4.3 and 4.8%, respectively (n=7). This method has been applied to the determination of trace manganese (II) in actual sample with high sensitivity and good selection. And the reaction mechanism of SS-RTP is discussed.
authors.affiliation: Department of Chemistry, Zhangzhou Normal College, Zhangzhou 363000, P. R. China. zzsyliujiaming@163.com
authors.forename: Jia-Ming
authors.initials: JM
authors.lastname: Liu
authors.forename: Xiao-Jie
authors.initials: XJ
authors.lastname: Cui
authors.forename: Fei
authors.initials: F
authors.lastname: Gao
authors.forename: Lai-Ming
authors.initials: LM
authors.lastname: Li
authors.forename: Xiu-Chai
authors.initials: XC
authors.lastname: Huang
authors.forename: Min-Lan
authors.initials: ML
authors.lastname: Yang
authors.forename: Fei-Ming
authors.initials: FM
authors.lastname: Li
authors.forename: Hong
authors.initials: H
authors.lastname: Wu
mesh_terms: D015082:2,2'-Dipyridyl / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007202:Indicators and Reagents / Q000737:chemistry*; D008163:Luminescent Measurements; D008345:Manganese / Q000032:analysis*; D016877:Oxidants / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence; D013696:Temperature
chemical_list: D007202:Indicators and Reagents; D016877:Oxidants; D008345:Manganese; D015082:2,2'-Dipyridyl; D006861:Hydrogen Peroxide