水中痕量镉的磁性碳纳米管固相萃取联用石墨炉原子吸收光谱测定法  

Determination of trace amounts of cadmium in water by magnetic carbon nanotubes solid-phase extraction combined with graphite furnace atomic absorption spectrometry

作　　者：汪怡 王露[1] 杭学宇[1] 王芹[1] 宋鑫[1] 冯晓青[1] 徐瑞[1] 

机构地区：[1]淮安市疾病预防控制中心检验科,江苏淮安223001

出　　处：《职业与健康》2016年第1期48-51,共4页Occupation and Health

基　　金：江苏省卫生厅预防医学科研课题项目(Y2013037);淮安市科技局科技支撑(社会发展)项目(HAS2013030);淮安市预防医学会科研课题项目(HAYF201514)

摘　　要：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 method based magnetic solid-phase extraction（ MSPE） combined with graphite furnace atomic absorption spectrometry（ GFAAS）. [Methods]Magnetic multiwalled carbon nanotubes were synthesized and used as solid-phase extraction adsorbents for separation enrichment of trace cadmium in water with detection by GFAAS. The main factors affecting the signal intensity such as sample p H value, flow rate of sample, adsorbent amount, sample volume, eluent concentration and volume were optimized. [Results]Under the optimum experimental conditions, the calibration curve is linear in the concentration range of 0.01-2.00 μg/L with a standard deviation of 2.3%（ 0.5 μg/L, n=11）. The limit of detection was as low as 1.2 ng/L. The enhancement factor was able to reach 100. The absorbent could be repeatedly used at least 100 times. [Conclusion]The method is easy operation, high sensitivity and accuracy, which can be applied to the rapid detection of cadmium in real samples.

关 键 词：磁性碳纳米管 磁性固相萃取 石墨炉原子吸收光谱法 镉 

分 类 号：R115[医药卫生—公共卫生与预防医学]