Determination of Hexacyanocobaltate(III) (cobalt cyanide) and Hexacyanoferrate(III) (ferricyanide) in Waste and Natural Waters

Cobalt is recognized as an environmental contaminant with toxic effects on both aquatic ecosystems and human health, making it a priority for removal from industrial and municipal waste streams. However, remediation efforts may occasionally underperform, suggesting the presence of more stable cobalt species—such as Hexacyanocobaltate(III)—that are resistant to conventional treatment methods.

Hexacyanocobaltate(III) is a highly stable, anionic cobalt complex. While current evidence suggests it may not exhibit the same level of toxicity as free cobalt ions or other cobalt species, its persistence in treated waters can complicate remediation outcomes.

To address this challenge, we offer a specialized analytical method capable of distinguishing Hexacyanocobaltate(III) from free cobalt and other cobalt-containing species. This method enables:

• • Separation and quantification of Hexacyanocobaltate(III) using anion chromatography coupled with ICP-MS.
  • Comparison to total cobalt concentrations to determine the proportion of cobalt present as this stable complex.
  • Estimation of free cobalt and other species, ensuring a comprehensive understanding of cobalt speciation in the sample.
  • In-house total and dissolved cobalt analysis, available as a complementary service.