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AN227 Determination of Total Cyanide in Municipal Wastewater
DescriptionIn this Application Note, we describe an ion exclusion chromatography (ICE) method with pulsed amperometric detection (PAD) using a Pt disposable working electrode and an optimized waveform to determine total cyanide in drinking and wastewater samples. The samples are acid distilled, trapped in 1 M NaOH, and diluted to 250 mM NaOH prior to analyses using the EPA-approved MICRO DIST™ sample preparation system. This ICE-PAD method has the advantages of eluting cyanide before sulfide with Rs > 3, and excluding other interferences, such as chloride and sulfate that typically interfere in ion exchange methods resulting in a more sensitive and accurate method. Analytes are also selectively detected by PAD while other compounds remain undetected. This ICE-PAD method provides a fast, reliable, sensitive, and selective method to directly determine µg/L to sub- µg/L concentrations of total cyanide in wastewater. In this Application Note, we demonstrate the linearity, detection limit of 0.27 µg/L, accuracy, and precision for the determination of total cyanide in drinking water and wastewater samples using the MICRO DIST system and ICE-PAD.
For Research Use Only. Not for use in diagnostic procedures.