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

Xue Tao Zhao, He Ping Zhao, Yi Quan Le, Teng Zeng, Hong Wen Gao

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4 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)251-263
Number of pages13
JournalAnnali di Chimica
Issue number3-4
StatePublished - Mar 2007
Externally publishedYes


ASJC Scopus subject areas

  • Analytical Chemistry
  • Environmental Science(all)

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