Spectrophotometric Determination of Trace Lead in food with Trihydrozyphenylfluorone in Microemulsion after Sulphydryl Deztrane Gel for Preconcentration and Separation
A highly sensitive and selective spectrophotometric method is proposed for the determination of trace lead in food. The method is based on the reaction of lead(Ⅱ) with a new analytical reagent trihydroxyphenylfluorone (TH-PF). TH-PF reacts with lead(Ⅱ) and form a stable 1:2 complex at pH 10.40.Its apparent molar absorption coefficient and Sandells sensitivity at 580 nm are 4.56×104 L/mol/cm and 4.54×10-3 μg/cm2. Beers law is obeyed in the range of 0-1.6 μg/mL of lead(Ⅱ). In addition, the optimal condition for the determination with different microemulsion medium was investigated in detail. Sulphydryl dextrane gel (SDG), in which sulphydryl group has a big share, is a good type metallic ion adsorbent. It presents the advantages of higher adsorption capacity, better reuse ability and higher mechanical stability. Therefore, 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 is used to determine trace lead in food with satisfactory results.
Lead (Ⅱ) trihydrozyphenylfluorone microemulsion food sulphydryl Deztrane Gel preconcentration and separation spectrophotometry
Mei Yan Shuyuan Liu Xin Chen Bin Du
School of Chemistry and Chemical Engineering University of Jinan Jinan,Peoples Republic of China
国际会议
北京
英文
1-4
2009-06-11（万方平台首次上网日期，不代表论文的发表时间）