论文部分内容阅读
目的:研究持久化学改进剂铱在电热原子吸收光谱法测定水中痕量铅中的应用。方法:用铱作为持久改进剂处理石墨平台,考察了灰化温度、原子化温度及各项分析性能指标,并与NH4H2PO4+Mg(NO3)2、PdCl2常规改进剂比较。结果:采用铱作持久改进剂,电热原子吸收光谱法测定水中铅,灵敏度高且背景信号值低,较低的原子化温度可延长石墨管使用寿命。相对标准偏差RSD值(n=7)在0.6%~3.2%之间,样品加标回收率在93.2%~104.5%之间,检出限为0.4μg/L,特征质量为1.5 pg。结论:该方法准确、灵敏、简便,完全符合痕量元素分析要求。
Objective: To study the application of persistent chemical modifier iridium in the determination of trace lead in water by electrothermal atomic absorption spectrometry. Methods: The graphite platform was treated with iridium as a permanent modifier. The ashing temperature, atomization temperature and various analytical performance indicators were investigated. The results were compared with conventional modifiers of NH4H2PO4 + Mg (NO3) 2 and PdCl2. Results: Iridium as a lasting modifier, electrothermal atomic absorption spectrometry for the determination of lead in water with high sensitivity and low background signal value, lower atomization temperature can extend the service life of graphite tube. The relative standard deviations RSD (n = 7) ranged from 0.6% to 3.2%. The spiked recoveries ranged from 93.2% to 104.5% with a detection limit of 0.4 μg / L and a characteristic mass of 1.5 pg. Conclusion: The method is accurate, sensitive and simple, which is in full compliance with the requirements of trace element analysis.