Zhao Xue-Tao, Zhao He-Ping, Le Yi-Quan, Zeng Teng, Gao Hong-Wen
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China.
Ann Chim. 2007 Mar-Apr;97(3-4):251-63. doi: 10.1002/adic.200790009.
The chromophore chlorophosphonazo-p-Cl (PCCPA) was used to complex Co(II) and Cu(II) at pH 9.18. The formation of Co(PCCPA)2 and Cu(PCCPA)2 complexes were characterized by the spectral correction technique. Co(II) could competitively substitute Cu(II) from the Cu(II)-PCCPA complex via electrophilic effect. With the assistance of the light-absorption ratio variation approach, the electrophilic substitution complexation showed a high selectivity and good sensitivity with 1.9 ng mL(-1) of LOD. The proposed method has been applied to the direct detection of Co(II) in surface water and wastewater with good percent of recovery.
发色团对氯偶氮氯膦（PCCPA）用于在pH 9.18条件下与Co（II）和Cu（II）络合。通过光谱校正技术对Co（PCCPA）2和Cu（PCCPA）2络合物的形成进行了表征。Co（II）可通过亲电效应从Cu（II）-PCCPA络合物中竞争性取代Cu（II）。借助吸光率变化方法，亲电取代络合表现出高选择性和良好的灵敏度，检测限为1.9 ng mL（-1）。所提出的方法已应用于地表水和废水中Co（II）的直接检测，回收率良好。
