What is the minimum cyanide concentration in waste to be classified under A101 (waste containing cyanide)?

• A. 20 ppm
• B. 100 ppm
• C. 200 ppm
• D. 1000 ppm

Answer: (C)

The main idea here is how regulatory thresholds determine when waste is considered to contain cyanide. A cyanide concentration of 200 parts per million or more is the point at which waste is classified as containing cyanide under this rule. That 200 ppm cutoff exists because cyanide is highly toxic, so the regulation flags wastes that reach a level with real risk while not over-regulating trace amounts.

If the cyanide level is below 200 ppm, it isn’t categorized under this specific A101 waste class for cyanide content, though it could still be hazardous for other reasons. A level well above 200 ppm, such as 1000 ppm, would also qualify, but 200 ppm is the minimum that triggers the classification.