持久性化学改进剂铱用于电热原子吸收光谱法直接测定酒中痕量铅

Use of Permanent Chemical Modifier Iridium for the Detection of Lead in Wine by Electro-Thermal Atomic Absorption Spectrometry

目的使用持久性化学改进剂铱,建立了酒中痕量铅的电热原子吸收光谱测定法。方法用铱作为持久性化学改进剂处理石墨平台进行试验,考察了灰化温度、原子化温度及各项分析性能指标。结果样品加标回收率在95.7%～104.6%之间,相对标准偏差RSD(n=5)在0.3%～2.8%之间,检出限为0.4μg/L,特征质量为30pg。结论该方法准确、灵敏、简便,符合痕量元素分析要求。

Objective To establish a method for the detection of lead in wine by using iridium （Ir） as a permanent chemical modifier for electro-thermal atomic absorption spectrometry （ETAAS）.Method Using iridium （Ir） as a permanent chemical modifier coated on the integrated platform of transversely heated graphite atomizer （THGA）.Pyrolysis temperature,atomization temperature and analysis performances were estimated.Results With the use of Ir,the RSDs （n=5） were in the range of 0.3%-2.8% and the recoveries were in the range of 95.7%-104.6%.Detection limit for lead was 0.4 μg /L,the characteristic mass was 30 pg.Conclusion This method was accurate,simple and sensitive,and met the demands for analyzing trace elements.