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Real-time analysis for pollution prevention means monitoring a process

  • A.after the reaction to record what was emitted
  • B.at the discharge point of the effluent
  • C.annually as part of a compliance return
  • D.during the reaction so it can be controlled

Answer: D

Correct answer: during the reaction so it can be controlled

In-process analysis lets the operator see the reaction as it proceeds and intervene - stopping at the optimum conversion, avoiding an excursion, preventing an off-specification batch that would become waste. Measuring the effluent afterwards records the loss without preventing it, which is the difference the principle is drawing.

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