Determination of trace scandium in fly ash by calcein fluorescence spectrophotometry
OUYANG Zhen-zhong1,BAI Shan1,LUO Dao-cheng*2
1. Changsha Environmental Protection College,Changsha 410004,China; 2. School of Chemistry and Chemical Engineering,Hunan University of Science and Technology,Xiangtan 411201,China
Abstract：The fluorescence reaction between calcein and scandium was studied. The results showed that trace scandium ions could react with calcein to form complex in NH3·H2O-NH4Cl buffer solution at pH 8.5 in presence of surfactant Triton X-100, and the fluorescence intensity of this system was enhanced significantly. The excitation wavelength and emission wavelength was 495 nm and 520 nm, respectively. The content of scandium in range of 0.021-1.80 μg/mL exhibited good linearity to its fluorescence intensity difference (ΔF). The equation of linear regression was ΔF=3.431+2.473 ρ (μg/mL) with correlation coefficient of r=0.998 1. The detection limit was 0.021 μg/mL. The interference tests indicated that most common ions did not interfere with the determination after scandium in fly ash sample was extracted and separated with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP)-methylbenzene. The proposed method was applied to determination of trace scandium in fly ash samples. The results were consistent with those obtained by inductively coupled plasma atomic emission spectrometry (ICP-AES).The relative standard deviation (RSD, n=6) was 0.57%-1.0%. The recoveries were between 98% and 105%.
LI J N,ZHANG L,DENG P H. Trace determination of scandium using adsorption voltammetry of mix-polynuclear complex of scandium-calcium-alizarin red S at carbon paste electrode[J]. Journal of Rare Earths,2004,22(5):618-622.
[9]
李帆,冯艳秋. ICP-AES法测定铝合金中钪元素的方法研究[J]. 光谱学与光谱分析(Spectroscopy and Spectral Analysis),2003,23(5):968-971.
[10]
郑用熙,范映辛,李隆弟. Sc-Morin-SDS体系荧光性质的研究和应用[J]. 分析试验室(Chinese Journal of Analysis Laboratory),1993,12(2):8-12.
[11]
董壮龙,魏正妍,韩国防,等. 二溴对羧基氯磺酚光度法测定地质物料中痕量钪[J]. 岩矿测试(Rock and Mineral Analysis),1998,17(2):131-133.
