摘要
研究发现Ag+为离子微扰剂时3.5代树枝状分子(3.5-G-D)在滤纸固体基质上能发射稳定的室温磷光(RTP).在70℃、15min条件下,基于Cd-3.5-G-D配合物能催化KBrO3氧化3.5-G-D的反应,导致3.5-G-D的RTP信号剧烈猝灭,且△Ip与Cd2+含量成线性关系,据此建立了Cd-3.5-G-D配合物催化KBrO3氧化3.5-G-D固体基质室温磷光法(SS-RTP)测定痕量镉的新方法.该方法灵敏(检出限(LD)为1.2 ag spot–1)、准确、选择性好,适用于生物样品中痕量镉的测定.同时探讨了Cd-3.5-G-D配合物催化SS-RTP测定痕量镉机理.本研究揭开3.5-G-D新的应用领域,发展了新的SS-RTP.
Under the condition of 70 ℃,15 min and using Ag＋ as an ion perturber,the characteristic of 3.5-generation polyamidoamine dendrimers（3.5-G-D） that could emit stable room temperature phosphorescence（RTP） signal on filter paper substrate was studied.It was found that tween-80 could cause the RTP signal of 3.5-G-D to enhance sharply.KBrO3 could oxidize 3.5-G-D in 3.5-G-D-Tween-80 molecule,which caused the RTP signal of 3.5-G-D to quench.The ΔIp was linear correlation to the content of Cd2＋.Based on the facts above,a new catalytic solid substrate-room temperature phosphorimetry（SS-RTP） for determination of trace cadmium has been established.This method was sensitive（detection limit： 1.2 ag spot–1）,accurate and selective.It has been successfully applied to the determination of trace cadmium in hair and tea samples.Meanwhile,the mechanism for the determination of trace cadmium by Cd-3.5-G-D catalytic SS-RTP was also discussed.This research exploded the new application field of 3.5-G-D and developed the novel SS-RTP.
出处
《漳州师范学院学报（自然科学版）》
2011年第1期56-62,共7页
Journal of ZhangZhou Teachers College（Natural Science)
基金
漳州职业技术学院科技项目(ZZY1009)
作者简介
黄晓梅（1983-），女，福建省漳浦县人，助教，硕士．
