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目的:优选石墨炉原子吸收光谱法测定银的程序升温条件,了解生活饮用水中银的含量。方法:用SRM响导针对信号进行数学建模,确定灰化和原子化温度,并用此条件对水样进行分析。结果 :优化结果为灰化温度:501℃,原子化温度:1796℃;在0μg/L~20μg/L线性范围内,r=0.9993.准确度和精密度较高,符合检测要求。结论 :SRM响导设置简单,易于操作,大大优于人工选择;随机测得的水样中银的含量均低于限值(0.05 mg/L)。
OBJECTIVE: To determine the temperature-programmed conditions of silver by graphite furnace atomic absorption spectrometry and understand the content of silver in drinking water. METHODS: The signals were mathematically modeled using a SRM guide and the ashing and atomization temperatures were determined, and the water samples were analyzed using this condition. Results: The optimized results were the ashing temperature: 501 ℃ and the atomization temperature: 1796 ℃, r = 0.9993 in the linear range of 0μg / L ~ 20μg / L. The accuracy and precision were higher, which met the testing requirements. CONCLUSIONS: The setup of the SRM is simple and easy to operate, which is much better than the manual selection. The silver content in the randomly measured water samples is lower than the limit (0.05 mg / L).