Quantification of trace metals in water using complexation and filter concentration

Bella Dolgin, Valery Bulatov, Julia Japarov, Eyal Elish, Elad Edri, Israel Schechter*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Various metals undergo complexation with organic reagents, resulting in colored products. In practice, their molar absorptivities allow for quantification in the ppm range. However, a proper pre-concentration of the colored complex on paper filter lowers the quantification limit to the low ppb range. In this study, several pre-concentration techniques have been examined and compared: filtering the already complexed mixture, complexation on filter, and dipping of dye-covered filter in solution. The best quantification has been based on the ratio of filter reflectance at a certain wavelength to that at zero metal concentration. The studied complex formations (Ni ions with TAN and Cd ions with PAN) involve production of nanoparticle suspensions, which are associated with complicated kinetics. The kinetics of the complexation of Ni ions with TAN has been investigated and optimum timing could be found. Kinetic optimization in regard to some interferences has also been suggested.

Original languageEnglish
Pages (from-to)1482-1488
Number of pages7
Issue number4-5
StatePublished - 15 Jun 2010
Externally publishedYes


  • Environmental analysis
  • Heavy metals
  • Water


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