Which statement about the environmental fate of copper algicides is true?

• A. They persist indefinitely in water
• B. They are an element that precipitates to sediment
• C. They rapidly biodegrade
• D. They evaporate

Answer: (B)

Copper algicides behave as metals in the environment. When they enter water, they tend to form insoluble compounds such as copper hydroxide or basic copper carbonates, which drop out of solution and settle into the sediment or bind to sediment particles and organic matter. This makes sedimentation the dominant fate path for dissolved copper in many aquatic systems. Metals are not biodegradable, so they aren’t broken down by microbes, and they aren’t volatile, so they don’t evaporate. So the idea that copper compounds precipitate to sediment best describes their environmental fate.