固相萃取-流动注射化学发光法测定奶粉中的三聚氰胺

建立一种快速测定奶粉中三聚氰胺的新方法，利用鲁米诺-高锰酸钾化学发光体系，结合流动注射技术，对样品中的微量三聚氰胺进行测定。结果表明：三聚氰胺对鲁米诺-高锰酸钾化学发光体系具有显著的抑制作用，在最佳实验条件下，方法的线性范围为1×10-11～1×10-6mol/L，检出限(3RSN)为4.0×10-8mg/L，RSD为1.1%(n=11)，样品加标回收率为96.1%～102.2%，用于奶粉中三聚氰胺含量的测定，结果令人满意。

Determination of Melamine in Milk Powder by Flow Injection-Chemiluminescence Combined with Solid Phase Extraction

In order to establish a new method to quickly determine melamine in milk powder, a chemiluminescence (FI-CL) system of luminol and potassium permanganate was coupled with flow injection technology. In the method, the chemiluminescence (CL) reaction between luminol and potassium permanganate was significantly reduced by melamine. Under the optimal experimental conditions, melamine concentration in the range of 1 × 10-11 to 1 × 10-6 mol/L was linearly proportional to the depression of CL signals. The detection limit was 4.0 × 10-8 mg/L, with a RSD of 1.1% for 11 replicate determinations. The recovery rates for melamine in a certain brand of milk powder were in the range of 96.1% to 102.2%. This method has been successfully applied to the determination of melamine in real milk powder samples.