【摘要】 Ce³⁺在pH<6.2的KCl介质中受252.4nm的紫外光激发时,发射出的353.8nm荧光可用于痕量铈的测定.在pH5～6时,用Al₂（SO₄）₃可消除Fe³⁺的干扰.在0～3.0×10^-6mol/L范围内,荧光强度与Ce³⁺的浓度遵守ΔF=2.37×10⁶C—0.001方程（n=10,r=0.9999）,检测限为6.0×10^-9mol/L.用于GWB07103（GSR-1）岩石成分分析的回收率为95.0％～103.2％,变异系数是4.18％（n=10）;用于水系沉积物和土壤标准物质中铈含量分析,结果与标准值无显著差异.更多还原

【Abstract】 Our research showed that the constant fluorescence of Ce3+ in the medium of KCl with pH lower than 6. 2 could be used to determine trace cerium when it was excited at 252. 4 nm. Our working acid range is pH 5-6 and the interference of Fe3+ was eliminated by addition of Al2(SO4)3. Over the range of 0- 3. 0× 10-5 mol/L Ce3+, the equation of ΔF = 2.37× 106C -0.001(n=10, r=0. 9999) was abided and the determination limit was 6.0×10-9 mol/L. The recovery and relative standard deviation for GBW07103 rock reference material was 95.0%-103.2% and 4.18(n=10) respectively. The determination results of GBW07402 soil and GBW07311 stream sediment reference material were satisfactory.更多还原