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目的建立磁性固相萃取联用石墨炉原子吸收光谱法检测水中痕量镉的方法。方法制备磁性碳纳米粒子,以其作为磁性固相萃取吸附剂用来萃取水中的痕量镉并通过石墨炉原子吸收光谱法进行检测。对影响实验信号强度的主要因素如溶液p H值、样品流速、吸附剂用量、样品体积、洗脱液浓度和体积等进行条件优化。结果在最佳实验条件下,镉在0.01~2.00μg/L内呈良好线性关系,标准偏差为2.3%(0.5μg/L,n=11),检出限低至1.2 ng/L,富集因子可达到100,且吸附剂可以反复使用至少100次。结论该方法操作简单,灵敏度高,准确度好,可以应用于实际样品中镉的快速检测。
Objective To establish a magnetic solid phase extraction coupled with graphite furnace atomic absorption spectrometry for the determination of trace cadmium in water. Methods Magnetic carbon nano-particles were prepared and used as magnetic solid-phase extraction adsorbents to extract trace cadmium in water and detected by graphite furnace atomic absorption spectrometry. The main factors influencing the signal strength of the experiment, such as pH value of solution, sample flow rate, adsorbent dosage, sample volume, eluent concentration and volume, were optimized. Results Under the optimal experimental conditions, there was a good linear relationship between cadmium concentration in the range of 0.01-2.00 μg / L with a standard deviation of 2.3% (0.5 μg / L, n = 11) and a detection limit as low as 1.2 ng / L. Factors can reach 100, and the adsorbent can be used repeatedly at least 100 times. Conclusion The method is simple, sensitive, accurate and can be applied to the rapid detection of cadmium in real samples.