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目的建立一种快捷、高灵敏度的磁性固相萃取/氢化物发生-原子荧光光谱法的检测技术并且用于测定水中汞的残留量。方法水样品经磁性聚苯乙烯纳米材料(HCP-Fe_3O_4)预富集后,用氢化物发生-原子荧光光谱法测定痕量汞。研究样品氢化物产生的条件、样品pH值、萃取时间和洗脱剂用量等对汞的回收率的影响。结果在最优实验条件下,汞在0.5~10 ng/L浓度范围内呈良好线性关系,富集因子为150。相关系数均不小于0.998 6,检出限为0.1 ng/L,平均回收率为99.1%~102.4%,相对标准偏差为2.8%。结论该方法可用于实际样品的分析。
Objective To establish a rapid and sensitive magnetic solid-phase extraction / hydride generation-atomic fluorescence spectrometry detection technique and to determine the residual mercury in water. Methods Water Samples were pre-enriched with magnetic polystyrene nanomaterials (HCP-Fe 3 O 4) to determine trace mercury by hydride generation-atomic fluorescence spectrometry. Study the sample hydride generation conditions, sample pH value, extraction time and the amount of eluent on mercury recovery. Results Under the optimal experimental conditions, mercury had a good linear relationship in the concentration range of 0.5-10 ng / L, and the enrichment factor was 150. The correlation coefficient was not less than 0.998 6, the detection limit was 0.1 ng / L, the average recovery was 99.1% ~ 102.4%, and the relative standard deviation was 2.8%. Conclusion This method can be used for the actual sample analysis.