Dose-Response Relationship
The relationship between amount of pollutant exposure and severity of harmful effect, fundamental to toxicology and risk assessment.
Formula
NOAEL → LOAEL → threshold → effective dose → LD50 (points on dose-response curve)
Real World
UK drinking water regulations set a maximum nitrate concentration of 50 mg/L, derived directly from dose-response data linking nitrate exposure to methaemoglobinaemia ('blue baby syndrome') in infants.
Exam Focus
Sketch the sigmoid curve and label threshold, NOAEL, and LD50 when asked to explain dose-response relationships; visual annotation gains method marks.
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