摘要
研究了浊点萃取-火焰原子吸收光谱法测定痕量铅的新方法。利用表面活性剂聚乙二醇辛基苯基醚(TritonX-100)和配合剂1-苯基-3-甲基-4-苯甲酰吡喹啉酮-5(PMBP)对试样中的Pb()进行浊点萃取。并详细探讨了溶液pH值、试剂浓度等实验条件对浊点萃取及测定灵敏度的影响。在最佳条件下,铅的富集倍数为20,检出限为0.065μg.L-1,RSD为2.8%(n=5,CPb2+=20μg/mL)。本法对实际样品中的铅进行富集和测定,结果令人满意。
A new method for the determination of trace amount of lead by flame atomic absorption spectrometry with cloud point extraction was proposed.Lead was complexed with PMBP in an acidic medium using Triton X-100 as surfactant and quantitatively extracted into a small volume of the surfactant-rich phase after centrifugation.The effect of experimental conditions such as pH and concentration of reagents on cloud point extraction and determination sensitivity was discussed.The chemical variables affecting the separation phase and extraction recovery were optimized.Under the optimum conditions,the limit of detection for lead was 0.065μg.L-1with an enhancement factor of 20 and the relative standard deviation was 2.8%（n=5,CPb2＋=20μg/mL）.The method was applied to the determination of lead in reference material and soybean samples with satisfactory results.
出处
《光谱实验室》
CAS
CSCD
北大核心
2011年第1期299-302,共4页
Chinese Journal of Spectroscopy Laboratory
基金
江苏省青蓝工程资助项目(2007.12)
关键词
铅
浊点萃取
火焰原子吸收光谱法
Lead
Cloud Point Extraction
Flame Atomic Absorption Spectrometry
