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目的研究ELC石墨管涂锆的简易程序并用于石墨炉原子吸收测定饮水中铝的方法。方法采用每次进样20μl 4 g/L ZrOCl_2·8H_2O溶液,按仪器推荐的升温程序对ELC石墨管进行涂锆处理5次,再空烧5次即完成石墨管的涂锆处理。优化灰化、原子化温度等测试条件,在最优化测试条件下测试1%HNO_3空白溶液吸光度至低于0.005时正式开始测试。结果 ELC石墨管经涂锆处理,石墨炉原子吸收法测定饮水中铝,石墨管使用500余次未见性能显著下降(平行测定RSD<10%)。采用次灵敏线257.3 nm做测试波长,在0μg/L~200μg/L时线性关系良好,r>0.995。测定Al环境标准水样[GSB07-1375-2001,(150±15)μg/L],结果铝含量为135μg/L~163μg/L,均值为151μg/L,再现性精密度RSD为5.3%(n=16)。结论本法简便、快速、准确,可满足日常监测饮水中铝的测定。
Aim To study the simple procedure of coating zirconium with ELC graphite tube and to determine the aluminum in drinking water by graphite furnace atomic absorption spectrometry. Methods The solution of ZrOCl 2 .8H 2 O 4 g / L was injected into the ELC graphite tube 5 times with the recommended heating program. Optimization of ashing, atomization temperature and other test conditions, the optimal test conditions test 1% HNO_3 blank solution absorbance to less than 0.005 when the official test. Results The ELC graphite tube was coated with zirconium and graphite furnace atomic absorption spectrometry was used to determine the aluminum content in drinking water. The performance of graphite tube decreased significantly after more than 500 times (RSD <10% in parallel). Using the second sensitive line at 257.3 nm as the test wavelength, the linearity was good at 0 μg / L ~ 200 μg / L with r> 0.995. The results showed that the content of aluminum was 135μg / L ~ 163μg / L with the mean value of 151μg / L and the reproducibility precision RSD was 5.3% (GSB07-1375-2001, n = 16). Conclusion This method is simple, rapid and accurate to meet the daily monitoring of aluminum in drinking water determination.