Final Method
On December 30, 1999 EPA approved Method OIA-1677 as an additional procedure for
determining available cyanide. This rule amends the Guidelines Establishing Test
Procedures for the Analysis of Pollutants under section 304 (h) of the Clean Water Act.
Proposed Method
On July 7, 1998 EPA proposed a method that will improve it's capability to accurately
measure available cyanide in wastewater through use of a ligand exchange/flow injection
technique. This method offers an alternate approach to testing for available cyanide and
is being proposed for approval for use in wastewater at 40 CFR Part 136.
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