对阳离子荧光染料藏红T(ST)在食品添加剂六偏磷酸钠(SHMP)存在时的溶液状态的荧光光谱及吸收光谱进行了研究.结果发现,在醋酸-醋酸钠缓冲条件下,SHMP使ST溶液发生自聚集,同时因静电作用二者形成杂化聚集体,导致ST的荧光强度和吸光度降低且在476 nm处出现新的吸收峰,但ST的荧光寿命没有发生明显的变化,表明SHMP静态猝灭ST的荧光.根据SHMP存在时ST吸光度的变化,建立了一种检测食品添加剂六偏磷酸钠的新方法,线性范围为1.0×10-6～1.1×10-5 mol/L,检测限为3.4 × 10-7 mol/L.方法成功应用于饮料中六偏磷酸钠的测定,相对标准偏差小于4.6％,回收率在95.0％～104.0％之间.
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