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.

Hong-Wen Gao, Sheng-Yi Zhang, Hong-Yan Wang, Si-Qing Xia, Ya-Lei Zhang

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

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy 2005 Jan 14

filter terms:

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.

Citation

Hong-Wen Gao, Sheng-Yi Zhang, Hong-Yan Wang, Si-Qing Xia, Ya-Lei Zhang. 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. Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy. 2005 Jan 14;61(3):447-54