CUN Li-hui,LI Bi-ying,YIN Yu-zhong,et al.Optimization of Analysis Condition for Monitoring Thallium in Water by Graphite Furnace Atomic Absorption Spectrometry[J].China Water & Wastewater,2021,37(24):124-129.
石墨炉原子吸收光谱法监测水体中铊分析条件优化
- Title:
- Optimization of Analysis Condition for Monitoring Thallium in Water by Graphite Furnace Atomic Absorption Spectrometry
- 关键词:
- 饮用水; 地表水; 铊; 石墨炉原子吸收光谱法
- 摘要:
- 采用石墨炉原子吸收光谱法测定水环境中的铊，探讨了灯电流、灰化温度、原子化温度改变对吸光值的影响，研究了加入硝酸钯-硝酸镁基体改进剂对灰化温度、原子化温度和吸光值的影响，优化了石墨炉原子吸收光谱法测定铊的最佳仪器条件。并针对直接测定时分析方法无法满足标准的情况，探索了瓦里安AA240Z-GTA120多次进样的富集方法。此方法将单个样品的预处理时间从24 h缩短到10 min，简化了预处理过程。实验结果表明，浓缩5倍的检出限可达0.04 μg/L，线性相关系数大于0.999，相对标准偏差范围为0.1%～8.5%，加标回收率为87.0%～112.0%，此方法具备良好的精密度和准确度，检测限满足标准要求，可用于检测饮用水、地表水中的超痕量铊。
- Abstract:
- Thallium in water was determined by graphite furnace atomic absorption spectrometry. Influence of lamp current, ashing temperature and atomization temperature on absorbance was discussed. Effects of adding palladium nitrate-magnesium nitrate matrix modifier on ashing temperature, atomization temperature and absorbance were explored, and the optimum instrument conditions for determining thallium by graphite furnace atomic absorption spectrometry were optimized. The enrichment method of Varian AA240Z-GTA120 multiple injection was explored because the analytical method could not meet the standard in direct determination. The method shortened the pretreatment time of a single sample from 24 h to 10 min and simplified the pretreatment process. The detection limit was 0.04 μg/L after 5 times concentration. The linear correlation coefficient was greater than 0.999, the relative standard deviation was between 0.1%-8.5%, and the standard recovery rate was 87.0%-112.0%. Therefore, the method has good precision and accuracy, and the detection limit meets the standard requirements, which can be applied to detect ultra-trace thallium in drinking water and surface water.
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