Determination of cobalt at ng ml(-1) level in water using the electrophilic substiution complexation between co(II) and chlorophosphonazo-p-CL-Cu(II) complex.
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.
Zhao
Xue-Tao
XT
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China.
Zhao
He-Ping
HP
Le
Yi-Quan
YQ
Zeng
Teng
T
Gao
Hong-Wen
HW
D003035:Cobalt / Q000032:analysis*; D003116:Color; D003300:Copper / Q000737:chemistry*; D007220:Industrial Waste / Q000032:analysis; D009942:Organometallic Compounds / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013053:Spectrophotometry; D014867:Water; D014874:Water Pollutants, Chemical / Q000032:analysis