在pH=5.2的乙酸-乙酸钠缓冲溶液中,Ba2+与四苯硼钠在聚乙二醇存在下具有强的光散射信号.建立了高灵敏度、简单的痕量钡测定方法.光散射信号强度与Ba2+浓度成正比,方法的线性范围为3.00×10-8~3.43×10-6 g/mL,检出限为2.80×10-9 g/mL.合成样中痕量钡的测定回收率为97.8%~103.6%.方法简便、快速、灵敏度高、线性范围较宽.
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