【摘要】 合成了新试剂2-(2-喹啉偶氮)-1,3-二氨基苯(QADAB),研究了其与铜的显色反应,在pH=4 0的磷酸盐缓冲介质中,CTMAB存在下,QADAB与铜反应生成2∶1稳定配合物,该配合物可被WatersPorapak Sep Pak C18固相萃取小柱萃取,用乙醇(内含1%的乙酸)洗脱后用光度法测定,在乙醇相中配合物λmax=555nm,ε=8 08×104L·mol-1·cm-1.铜含量在0～1 0μg·mL内符合比尔定律,方法用于环境水样中微量铜含量的测定,结果令人满意.更多还原

【Abstract】 Based on synthesis of 2-（2-quinolinylazo）-1,3-diaminobenzene （QADAB）,the color reaction of QADAB with copper（Ⅱ） and the solid phase extraction of its colored complex with Waters Porapak^ Sep-Pak-C18 cartridge, a new method for the determination trace of copper（Ⅱ） was studied. In the medium of CTMAB and the presence of pH=4.0 KH₂PO₄-K₂HPO₄ buffer solution. QADAB can reacts with copper （II） to form a stable 2∶1 complex. The colored complex can be extracted by C₁₈ cartridge and eluted by ethanol, then can be determined by spectrophotometry. The molar absorptivity of the complex is 8.08×10⁴*!L·mol^-1·cm^-1 at 555*!nm. Beer’s law is obeyed in range of 0～1.0*!μg/mL. This method can be applied to the determination of copper in water with good results.更多还原