石墨炉原子吸收光谱直接进样法测定红葡萄酒中铅

Graphite Furnace Atomic Absorption Spectrometry-Direct Injection Method for Determination of Lead in Red Grade Wine

建立石墨炉原子吸收光谱法直接进样测定红葡萄酒中痕量铅的快速分析方法。通过对基体改进剂、灰化温度、原子化温度、背景扣除的研究,优化了测定红葡萄酒中重金属元素铅的条件。用浓度为0.15mol/L的硝酸调节红葡萄酒,磷酸二氢铵作基体改进剂,灰化温度700℃,原子化温度1800℃,NH4H2PO4扣除背景,氩气作保护气是进行红葡萄酒中铅测定的适宜条件。在优化条件下测定Pb的加标回收率为98.00%,相对标准偏差为3.004%。石墨炉原子吸收直接进样法测定红葡萄酒中铅的含量,不需要进行样品的复杂处理,方法快速、准确。

A rapid analytical method for direct injection determination of trace lead in red grape wine was proposed using graphite furnace atomic absorption spectrometry （GF-AAS）. Red grape wine was diffused in 0.15 mol/L HNO3 and injected into the GF with the addition of NH4H2PO4 as a matrix modifier and ashed at 700 ℃ and atomized at 1800 ℃ for the analysis under the protection of argon. The recovery of lead in spiked red wine was 98.00% with a relative standard deviation of 3.004%. This method is rapid and accurate without complex sample pretreatment.