In risk, what are the main difference(s) between the toxicity quotient approach and the hazardous quotient approach? Why can sediments become important in a risk assessment? What processes may retard...

1a) The ratio of a single substance exposure level over a specified time period (e.g., subchronic) to a
eference dose for that substance derived from a similar exposure period.
The HQ approach compares environmental concentrations of a contaminant with a measured effect or
no-effect level in test organisms.
HQ 4 <0.1, no hazard exists
HQ 4 0.1–1.0, hazard is low
HQ 4 1.1–10, hazard is moderate
HQ 4 >10, hazard is high
The hazard quotient (HQ) method, is a method which is commonly used for assessment of
isk to human health.
Toxicity is an intrinsic property of a substance. It determines the level of concentration of
that substance in human...