title: Application of light-absorption ratio variation approach as an optimum spectrophotometry to determination of Mn(II) in ng ml(-1) level using a competitive replacement complexation.
abstract: The light-absorption ratio variation approach (LARVA) which produces an outstandingly increasing of analytical sensitivity was applied to the quantitative detection of ultramicro amounts of Mn(II) by light-absorption spectrometry using the competitive replacement complexation among 1,5-di(2-hydroxy-5-sulfophenyl)-3-cyanoformazan (DSPCF), Zn(II) and Mn(II) in the presence of o-phenanthroline (OPTL). Not only masks OPTL foreign metal ions but also seriously sensitize the competitive complexation. All the binary and ternary complexes were characterized by the break point approach. Results have shown that the limit of detection (3delta) of Mn(II) is only 0.7 ng ml(-1). This method has been applied to analysis of water quality with satisfactory results.
authors.affiliation: Key Laboratory of Changjiang River Water Environment, Ministry of Education, State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, PR China. hwgao@mail.tongjj.edu.cn
authors.forename: Hong-Wen
authors.initials: HW
authors.lastname: Gao
authors.forename: Sheng-Yi
authors.initials: SY
authors.lastname: Zhang
authors.forename: Hong-Yan
authors.initials: HY
authors.lastname: Wang
authors.forename: Si-Qing
authors.initials: SQ
authors.lastname: Xia
authors.forename: Ya-Lei
authors.initials: YL
authors.lastname: Zhang
mesh_terms: D001667:Binding, Competitive; D005562:Formazans / Q000737:chemistry / Q000378:metabolism; D008345:Manganese / Q000032:analysis*; D010618:Phenanthrolines / Q000737:chemistry / Q000378:metabolism; D014867:Water / Q000032:analysis*; D015032:Zinc / Q000032:analysis
chemical_list: C488404:1,5-di(2-hydroxy-5-sulfophenyl)-3-cyanoformazan; D005562:Formazans; D010618:Phenanthrolines; D014867:Water; D008345:Manganese; D015032:Zinc; C025205:1,10-phenanthroline