摘要
研究了硫酸铵-1-（2-吡啶偶氮）-2-萘酚-吐温80体系萃取Cu（Ⅱ）的行为及最佳分相条件。结果表明，在pH6．8～8．5的NaOH-KH2PO4缓冲溶液中，在硫酸铵存在下，Cu（Ⅱ）-1-（2-吡啶偶氮）-2-萘酚的配合物可被吐温80固相完全富集而与Fe^3＋、Al^3＋、Co^2＋、Ni^2＋、Zn^2＋等定量分离。配合物最大吸收波长为560nm，表观摩尔吸光系数7．35×10^4L·mol^-1·cm^-1，铜含量在0～14μg／10mL范围内服从比耳定律。方法已用于粮食、茶叶等生物样品中痕量铜的测定，测定结粟的RSD（n=7）小于4．1％．回收率在98.6％～103.9％之间．
The solid-liquid extraction system of 1-（2-pyridylazo）-2-naphthol （PAN） and Tween-80 for Cu（Ⅱ） using （NH4）2SO4 as sahing out agent was studied and the extraction condition was optimized. In a phosphate buffer medium of pH 6. 8-8. 5, and by the addition of solid （NH4）2 SO4, the coordination complex of Cu （Ⅱ）-PAN was quantitatively extracted into Tween-80 which was separated as solid phase. The co-existing ions, Fe （m）. AP^＋. Co^2＋. Ni^2＋ and Zn^2＋, were quantitatively separated in this extraction. The apparent molar absorptivity was found to be 7. 35 × 10^4L·mol^-1 · cm^-1 at the absorption maxima （560 nm） of the coordination complex. Beer＇s law was kept in the range of 0-14 μg of Cu（ Ⅱ ） per 10 mL of solution. In its application to the determination of micro amounts of copper in samples of rice and tea, values of RSD （n=7） obtained were less than 4. 1%, and recoveries found were in the range of 98. 6% to 103.9%.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2006年第1期48-50,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
基金
广西教育厅科研项目[桂教科研(2003)22号]
