摘要
研究了微乳液介质中 ,pH =10 .4时 ,锌与三甲氧基苯基荧光酮 (TM PF)显色生成稳定的 1∶2络合物 ,于 5 80nm处摩尔吸光系数为 2 .94× 10 5L·mol-1·cm-1,锌含量在 0～ 0 .4g/L范围内符合比耳定律。引入微乳液介质 ,显著改善了锌的显色条件 ,使体系灵敏度提高。采用吸附容量大 ,且机械性能好的巯基葡聚糖凝胶分离富集 ,消除了共存离子的干扰 ,降低了测定体系的检出限。用所拟方法测定了施尔康药品、奶粉、味精、血清、尿样和发样中的锌 ,相对标准偏差低于 3.7% ;回收率在 95 .2 %～ 10 5 %。
The color reaction of zinc with trimethoxyphenylflurone (TM-PF) in microemulsion has been studied. Zinc(II) reacts with TM-PF to form a stable 1:2 complex at pH 10.4. Its apparent molar absorptivity is 2.94x10(5) L.mol(-1).cm(-1) at 580 nm. Beer's law is obeyed in the range of 0similar to0.4 mg/L. Zinc can be separated effectively from coexistent metal ions and enriched by sulphydryl dextrane gel (SDG), greatly improving the selectivity and sensibility of system. The method has been used to determine trace amount of zinc in Theragran leechdom, milk powder, serum, urine and hair samples with satisfactory results, the relative standard deviation is no more than 3.7%, and the recovery of standard addition is 95.2%similar to105%.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2004年第11期1509-1512,共4页
Chinese Journal of Analytical Chemistry
基金
山东省自然科学基金资助项目 (No .Y2 0 0 0B0 9)
山东省计划资助项目 (No .0 3C0 5 )
