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a. In risk, what are the main differences between the toxicity quotient approach and the hazardous quotient approach?

b. Why can sediments become important in a risk assessment?

c.What processes may retard chemical movement in the environment?

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a. In risk, what are the main differences between the toxicity quotient approach and the hazardous quotient approach?

The main difference in the two approaches is the hazardous approach compares estimated levels of exposure, while the toxicity approach compares measured concentrations of chemicals.
Hazardous quotient approach compares estimated levels of exposure of various environmental receptors to appropriate Toxicity Reference Values (TRVs). The comparison takes the form of a ratio, referred to as the Hazard Quotient (HQ), as follows:
HQ = Site Exposure Level / TRV

If ...

Solution Summary

Risk assessments are used to compare toxicity to environmental exposure. Two approaches, with alternative scenarios, are discuused.

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