Environmental Protection Agencies impose stringent limits for weak-acid dissociable metal-cyanide complexes (WAD) content in waters. The maximum contaminant level in drinking water is as low as 50 µg/L as CN-. Hence, sensitive methods for WAD cyanide determination are strongly required. Recently, ninhydrin reaction with free cyanide has been proven as a very sensitive at 485 nm (ε = 1.2 105 L/mol.cm), fast (15 min), selective and with non-toxic reagents. In the presence of free cyanide the absorbance measurement was based on the formation of a red hydrindatin resulting from cyanide’s catalytic effect on ninhydrin at pH 10.8. This report presents the results from a study on the reaction between ninhydrin and complexed cyanide at ambient conditions. The WAD complexes: Hg(CN)42-; Ni(CN)42-; Cu(CN)43-; Ag(CN)2-; Zn(CN)42-; Cd(CN)42- are discussed. The reaction kinetic and standard curves are presented. Ligand exchange approach was applied without additional separation. Ninhydrin was showed to be selective and sensitive for direct cyanide quantification.
Published in | Science Journal of Analytical Chemistry (Volume 2, Issue 1) |
DOI | 10.11648/j.sjac.20140201.11 |
Page(s) | 1-6 |
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Weak Acid Dissociable Cyanide, Ninhydrin, Spectrophotometry, Ligand Exchange
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APA Style
Andriana Risk Surleva, Sabina Bancila, Elena Veselinova Todorova. (2013). A Study on Ninhydrin Reaction with Weak Acid Dissociable Cyanide and Its Application for Toxic Cyanide Determination. Science Journal of Analytical Chemistry, 2(1), 1-6. https://doi.org/10.11648/j.sjac.20140201.11
ACS Style
Andriana Risk Surleva; Sabina Bancila; Elena Veselinova Todorova. A Study on Ninhydrin Reaction with Weak Acid Dissociable Cyanide and Its Application for Toxic Cyanide Determination. Sci. J. Anal. Chem. 2013, 2(1), 1-6. doi: 10.11648/j.sjac.20140201.11
AMA Style
Andriana Risk Surleva, Sabina Bancila, Elena Veselinova Todorova. A Study on Ninhydrin Reaction with Weak Acid Dissociable Cyanide and Its Application for Toxic Cyanide Determination. Sci J Anal Chem. 2013;2(1):1-6. doi: 10.11648/j.sjac.20140201.11
@article{10.11648/j.sjac.20140201.11, author = {Andriana Risk Surleva and Sabina Bancila and Elena Veselinova Todorova}, title = {A Study on Ninhydrin Reaction with Weak Acid Dissociable Cyanide and Its Application for Toxic Cyanide Determination}, journal = {Science Journal of Analytical Chemistry}, volume = {2}, number = {1}, pages = {1-6}, doi = {10.11648/j.sjac.20140201.11}, url = {https://doi.org/10.11648/j.sjac.20140201.11}, eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.sjac.20140201.11}, abstract = {Environmental Protection Agencies impose stringent limits for weak-acid dissociable metal-cyanide complexes (WAD) content in waters. The maximum contaminant level in drinking water is as low as 50 µg/L as CN-. Hence, sensitive methods for WAD cyanide determination are strongly required. Recently, ninhydrin reaction with free cyanide has been proven as a very sensitive at 485 nm (ε = 1.2 105 L/mol.cm), fast (15 min), selective and with non-toxic reagents. In the presence of free cyanide the absorbance measurement was based on the formation of a red hydrindatin resulting from cyanide’s catalytic effect on ninhydrin at pH 10.8. This report presents the results from a study on the reaction between ninhydrin and complexed cyanide at ambient conditions. The WAD complexes: Hg(CN)42-; Ni(CN)42-; Cu(CN)43-; Ag(CN)2-; Zn(CN)42-; Cd(CN)42- are discussed. The reaction kinetic and standard curves are presented. Ligand exchange approach was applied without additional separation. Ninhydrin was showed to be selective and sensitive for direct cyanide quantification.}, year = {2013} }
TY - JOUR T1 - A Study on Ninhydrin Reaction with Weak Acid Dissociable Cyanide and Its Application for Toxic Cyanide Determination AU - Andriana Risk Surleva AU - Sabina Bancila AU - Elena Veselinova Todorova Y1 - 2013/12/20 PY - 2013 N1 - https://doi.org/10.11648/j.sjac.20140201.11 DO - 10.11648/j.sjac.20140201.11 T2 - Science Journal of Analytical Chemistry JF - Science Journal of Analytical Chemistry JO - Science Journal of Analytical Chemistry SP - 1 EP - 6 PB - Science Publishing Group SN - 2376-8053 UR - https://doi.org/10.11648/j.sjac.20140201.11 AB - Environmental Protection Agencies impose stringent limits for weak-acid dissociable metal-cyanide complexes (WAD) content in waters. The maximum contaminant level in drinking water is as low as 50 µg/L as CN-. Hence, sensitive methods for WAD cyanide determination are strongly required. Recently, ninhydrin reaction with free cyanide has been proven as a very sensitive at 485 nm (ε = 1.2 105 L/mol.cm), fast (15 min), selective and with non-toxic reagents. In the presence of free cyanide the absorbance measurement was based on the formation of a red hydrindatin resulting from cyanide’s catalytic effect on ninhydrin at pH 10.8. This report presents the results from a study on the reaction between ninhydrin and complexed cyanide at ambient conditions. The WAD complexes: Hg(CN)42-; Ni(CN)42-; Cu(CN)43-; Ag(CN)2-; Zn(CN)42-; Cd(CN)42- are discussed. The reaction kinetic and standard curves are presented. Ligand exchange approach was applied without additional separation. Ninhydrin was showed to be selective and sensitive for direct cyanide quantification. VL - 2 IS - 1 ER -