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2012•Chinese Journal of Health Laboratory TechnologyRequires access

Determination of total cyanide in water by flow injection

Yang Min

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Abstract

Objective:To establish a method for detection of total cyanide in water by flow injection.Methods: In this study,FSIV+ Flow Injection was selected.The sample was decomposed in an acidic medium by UV-blight.The hydrogen cyanide was separated by on-line distillation at 160℃.Then the HCN reacted with chloramine T trihydrate while pH≤8 to produce hydrogen chloride,which reacted with pyridine-barbituric acid to give a red complex for detection at wavelength of 570 nm.Results: This method had a good correlation(r0.9990,n=6),the RSD% of standards and samples were both less than 5%.The spike recovery rate in samples was between 87% and 105% and the method detection limit was 0.97 μg/L.Conclusion: The method is rapid,accurate and highly sensitive.The results are satisfactory.

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What this paper is about

Objective:To establish a method for detection of total cyanide in water by flow injection.Methods: In this study,FSIV+ Flow Injection was selected.The sample was decomposed in an acidic medium by UV-blight.The hydrogen cyanide was separated by on-line distillation at 160℃.Then the HCN reacted with chloramine T trihydrate while pH≤8 to produce hydrogen chloride,which reacted with pyridine-barbituric acid to give a red complex for detection at wavelength of 570 nm.Results: This method had a good correlation(r0.9990,n=6),the RSD% of standards and samples were both less than 5%.The spike recovery rate in samples was between 87% and 105% and the method detection limit was 0.97 μg/L.Conclusion: The method is rapid,accurate and highly sensitive.The results are satisfactory.

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Available abstract

Objective:To establish a method for detection of total cyanide in water by flow injection.Methods: In this study,FSIV+ Flow Injection was selected.The sample was decomposed in an acidic medium by UV-blight.The hydrogen cyanide was separated by on-line distillation at 160℃.Then the HCN reacted with chloramine T trihydrate while pH≤8 to produce hydrogen chloride,which reacted with pyridine-barbituric acid to give a red complex for detection at wavelength of 570 nm.Results: This method had a good correlation(r0.9990,n=6),the RSD% of standards and samples were both less than 5%.The spike recovery rate in samples was between 87% and 105% and the method detection limit was 0.97 μg/L.Conclusion: The method is rapid,accurate and highly sensitive.The results are satisfactory.

Key concepts: Hydrogen cyanide, Cyanide, Chemistry, Detection limit, Chromatography, Pyridine, Barbituric acid, Hydrogen chloride

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