Question

Differentiate between degradable and non-degradable toxic substances giving appropriate examples

10 Mar 2024
Answer :
Word Count : 652
Criteria Degradable Toxic Substances Non-degradable Toxic Substances
Definition Substances that can be broken down by natural processes such as microbial activity, chemical reactions, or environmental factors. Substances that do not break down easily by natural processes and persist in the environment for long periods.
Environmental Impact Generally have a lower long-term impact on the environment as they are eventually broken down into less harmful substances. Tend to accumulate in the environment, leading to long-term ecological damage and bioaccumulation in the food chain.
Examples Organic waste, some pesticides, biodegradable plastics, and natural toxins like ethanol. Heavy metals (e.g., lead, mercury), DDT (dichlorodiphenyltrichloroethane), polychlorinated biphenyls (PCBs), and most synthetic plastics.
Breakdown Process Decomposed by microorganisms, enzymes, or natural chemical reactions. Resistant to biological breakdown and often require significant time and specific conditions to degrade, if they degrade at all.
Timeframe for Degradation Relatively short, ranging from days to a few _______ ______ ________ _____ ________ __________ __________ ______ _________ _________.
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