Spectrophotometric Determination of Tace Amount of Lead with Trimethoxyphenylfluorone in Microemulsion after Using Sulphydryl Dextran Gel for Preconcentration and Separation
WEI Qin1, DU Bin1, WU Dan1, OU Qing-yu2
1. School of Chemistry and Chemical Engineering, Ji'nan University, Ji'nan 250022, China 2. Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
Abstract:In this paper, the color reaction of lead with trimethoxyphenylfluorone (TM-PF) in microemulsion has been studied. Lead (Ⅱ) reacts with TM-PF to form a stable 1∶2 complex at pH 9.1. Its apparent molar absorptivity is 5.32×104 L·mol-1·cm-1 at 565 nm. Beer’s law is obeyed in the range of 0-1.5 μg·mL-1. Sulphydryl dextran gel (SDG), in which sulphydryl group has a big share, is a new type of metallic ion adsorbent. It presents the advantage of higher adsorption capacity, better reuse ability and higher mechanical stability. So the coexistent metal ions can be separated effectively and lead can be enriched by SDG, greatly improving the selectivity and sensibility of the system. The method was used to determine trace amount of lead in blood, hair and urine samples with satisfactory results.
Key words:Lead(Ⅱ);Trimethoxyphenylfluorone;Microemulsion;Biosamples;Sulphydryl Dextran Gel;Preconcentration and Separation Spectrophotometry
魏 琴1,杜 斌1,吴 丹1,欧庆瑜2 . 三甲氧基苯基荧光酮光度法测定生物样品中铅[J]. 光谱学与光谱分析, 2004, 24(11): 1400-1403.
WEI Qin1, DU Bin1, WU Dan1, OU Qing-yu2 . Spectrophotometric Determination of Tace Amount of Lead with Trimethoxyphenylfluorone in Microemulsion after Using Sulphydryl Dextran Gel for Preconcentration and Separation. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2004, 24(11): 1400-1403.