WEF Discussion Forums
Laboratory Management and Technical Issues
Cyanide Method Detection Limit
Is there an approved method that can achieve a 1 ppb (0.001 mg/L) detection of cyanide? We want to meet the Class 3 marine standards, but our contract lab can only get 2 ppb, based on their MDL study.
Actually, 2 ppb is pretty good. (Our MRL is 10 ppb using manual distillation and a Hach spec.) I'd check out the OI Analytical website and get the specs for their automated CN analyzer method, which is EPA approved at 40 CFR 136. You have to register (free) to get any useful info, though.
Thanks for that information.
There is a method. OIA-1677, DW, whch has a low detection limit (0.5 ug/L). We are still researching the availablity of the method, and the applicability to wastewater effluent. Any input?