直接进样石墨炉原子吸收测定双黄连口服液中铅的含量

目的: 建立直接进样石墨炉原子吸收法测定双黄连口服液中Pb含量的测量方法。 方法: 用浓度为0.15 mol·L^-1 HNO₃将双黄连口服液稀释5倍,以十二烷基硫酸钠作为基体改进剂,选择灰化温度600 ℃,原子化温度1800 ℃,氩气作为保护气体,利用石墨炉原子吸收法测定Pb的含量。 结果: 在优化条件下测定Pb的加标回收率为98.2%~102.7%,精密度(RSD)≤2.67%,检出限为3.16 ng·mL^-1。 结论: 直接进样石墨炉原子吸收法测定双黄连口服液中Pb的含量,不需要进行样品的复杂处理,方法快速、准确、无污染。

Objective: To establish the method for determination of lead in Shuang Huanglian oral liquid using direct sampling graphite furnace atomic absorption spectrophotometry. Methods: Shuang huanglian oral liquid was diluted for 5 times in 0.15 mol·L^-1 HNO₃ with the addition of C₁₂H₂₅NaO₄S as a matrix modifier and ashed at 600 ℃ and atomized at 1800 ℃ for determination of lead using direct sampling graphite furnace atomic absorption spectrophotometry under the protection of argon. Results: The recovery of lead in spiked Shuang Huanglian oral liquid was 98.2%-102.7%.The relative standard deviation of precision was less than or equal to 2.67%.The detection limit was 3.16 ng·mL^-1. Conclusion: This method is rapid,accurate and non-pollution without complex sample pretreatment.

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