Pesticide Toxicity Toxicity measure of ability of a chemical to injure /kill Exposure contact with chemical Hazard-degree of exposure toxicity level LDs0 lethal dose to kill 50%of test animals
Pesticide Toxicity Toxicity - measure of ability of a chemical to injure /kill Exposure - contact with chemical Hazard - degree of exposure & toxicity level LD50 - lethal dose to kill 50% of test animals
Pesticide Toxicity Acute toxicity injury/death from one exposure Chronic toxicity injury/death after long-term exposure Oral toxicity injury/death from swallowing chemical Dermal toxicity injury/death from exposure to skin
Pesticide Toxicity Acute toxicity - injury/death from one exposure Chronic toxicity - injury/death after long-term exposure Oral toxicity - injury/death from swallowing chemical Dermal toxicity - injury/death from exposure to skin
Pesticide Toxicity PPM (parts per million)-1 oz in 62,500 Ibs or 1 tbs in 3,906 gal PPB (parts per billion)-1000 times less than ppm 1 tbs in 3,906,000 gal Half-life time for 1/2 of initial concentration to be degraded Volatility ability of a liquid to evaporate
Pesticide Toxicity PPM (parts per million) - 1 oz in 62,500 lbs or 1 tbs in 3,906 gal PPB (parts per billion) - 1000 times less than ppm - 1 tbs in 3,906,000 gal Half-life - time for 1/2 of initial concentration to be degraded Volatility - ability of a liquid to evaporate
Parts per Million ppm 1 liter of water 1 kg 1 mg kg =1 ppm 1mm3 liter =1 ppm 1 mg liter =1 ppm
Parts per Million ppm 1 liter of water = 1 kg 1 mg / kg = 1 ppm 1mm3 / liter = 1 ppm 1 mg / liter = 1 ppm
One part per million is ·1 inch in 16 miles 。1 minute in two years 。1 cent in10,000 1 ounce of salt in 31 tons of potato chips 1 bad apple in 2,000 barrels of apples Mistretta USFS R-8
One part per million is • 1 inch in 16 miles • 1 minute in two years • 1 cent in $10,000 • 1 ounce of salt in 31 tons of potato chips • 1 bad apple in 2,000 barrels of apples Mistretta USFS R-8