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| Available Cyanide by Flow Injection/Ligand Exchange  United States                   Environmental Protection                  Agency Office of Water                  4303EPA-821-F-98-001                  January 1998Available Cyanide by Flow Injection/Ligand Exchange               (Method OIA-1677) 
**Summary**
*EPA is proposing in the Federal Register a method that will               improve EPA's capability to accurately measure available cyanide               in wastewater through use of a ligand exchange/flow injection/amperometric               technique. This method is being proposed for approval for use in               wastewater at 40 CFR part 136.*
**Background**
 The U.S. Environmental Protection Agency (EPA) publishes laboratory               analytical methods that are used by industrial and municipal facilities               in analyzing the chemical and biological components of wastewater,               drinking water, and sediment. This type of environmental sampling               is required by EPA regulations under the authority of the Clean               Water Act and the Safe Drinking Water Act.             
 Method OIA-1677 was developed by ALPKEM, a Division of OI Analytical,               in cooperation with the University of Nevada Reno Mackay School               of Mines, as a way to measure available cyanide without the interference               problems of the currently approved available cyanide methods.             
 EPA is proposing Method OIA-1677 as another testing procedure               for compliance monitoring under the National Pollutant Discharge               Elimination System; ambient water quality monitoring; development               of effluent limitations guidelines; and general laboratory use.               This rulemaking does not propose to repeal any of the currently               approved methods that test for available cyanide. Each permitting               authority must decide which method is appropriate for its needs.             
 This proposal would amend the Guidelines Establishing Test Procedures               for the Analysis of Pollutants under section 304(h) of the Clean               Water Act to augment currently approved available cyanide test procedures               with EPA Method OIA-1677: Available Cyanide by Flow Injection with               Ligand Exchange.             
**Benefits of Method OIA-1677**
Elimination of potential interferences                     
 Lower detection limit                     
 Better accuracy and precision                     
 Improved laboratory safety                     
 Lower costs of environmental measurements through a rapid                     automated process                     
 Reduction of hazardous chemical use and associated waste                     generation                 
**The Method**
 Method OIA-1677 provides another procedure for available cyanide.               Samples are treated with a ligand exchange solution to liberate               available cyanide which is then introduced into an automated flow-injection               analysis system for measurement of the liberated cyanides.             
 Method OIA-1677 contains QC acceptance criteria for all standardized               QC tests. Compliance with these criteria will allow the data user               to evaluate the quality of the results. This requirement increases               the reliability of results and provides a means to monitor analytical               performance, thereby providing a basis for sound, defensible data.             
**Additional Information and Copies**
 For additional information concerning this action, contact Dr.               Maria Gomez-Taylor at the U.S. Environmental Protection Agency,               Office of Water, Engineering and Analysis Division (4303), 401 M               Street, S.W., Washington, D.C.; at 202/260-1639; or at e-mail address:               [email protected].
The Federal Register notice contains instructions on how to obtain               additional information and how to review the public record for this               rulemaking. You also may obtain copies of Method OIA-1677 through               the U.S. EPA National Center for Environmental Publications and               Information (NCEPI), 11029 Kenwood Road, Cincinnati, OH 45242. 
 

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