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CYANIDE TOXICITY <br /> Concentrations for Hazardous Waste <br /> The threshold For cyanide in hazardous waste is not based on its <br /> acute oral toxicity, but rather on its acute aquatic toxicity and <br /> on its reactivity. The thresho4 concentration for acute aquatic <br /> toxicity is detailed in the March 26,. 1985 memo from William Quan <br /> to Mel Knight, and varies depending op physical state and pH of the <br /> waste between 206 mg/1 (in liquid, mg/kg in a solid) and 460 mg/1. <br /> The threshold for reactivity, as described by EPA in its July 12 , <br /> 1985 guidance, is that a waste capable of releasing greater than <br /> 250 mg HCN per kilogram of waste (based on prescribed test methods) <br /> would be reactive and therefore hazardous. <br /> Other Regulatory Thresholds for Cyanide Compounds: <br /> • Sectign 66696(a) (3) states that a waste which has an <br /> acute ; inhalation LC,, of less than 10,000 ppm is <br /> considered hazardous. Section 66696(b) provides a means <br /> to determine whether a waste mixture containing a <br /> compound which exceeds the threshold in §66696(a) (3) is <br /> hazardous by that section. <br /> C Section 66900(x) states that a liquid hazardous waste <br /> containing free cyanides at concentrations _> 1000 mg/1 <br /> are r stricted from land disposal. <br />