Question

In ecological risk assessment, risk is expressed as the ratio of _________

(a) PEC to PNEC

(b) PNEC to PEC

(c) PEC TO OEC

(d) PEN TO PEC

I had been asked this question in class test.

Asked question is from Risk Management topic in chapter Risk Management of Hazardous Waste Management

Answer 1

Right choice is (a) PEC to PNEC

To explain I would say: In ecological risk assessment, risk is expressed as the ratio of predicted environmental concentration (PEC) to predicted non – effect concentration (PNEC) for a particular chemical. A (PEC / PNEC) of less than 1 implies that the risk arising from the hazard of toxicity is low or effectively zero.