AGRI 1001 : RNR Study Guide For Exam 2
Document Summary
Acute toxicity- results in damage from a single exposure ex: hydrogen sulfide(h2s). Emitted from paper, pulp, asphalt plants, waste treatment plants. Is absorbed by lungs, irritation, breathing problems, loss of consciousness, death. Chronic toxicity- results from continued exposure and accumulation of toxic compounds ex of most toxic form: mercury(hg). Industrial emissions, accumulation in fish and shellfish as methyl mercury. Neurological problems, brain development, visual, motor skills, significant bioaccumulation and biomagnification. Inorganic pollutants- fertilizers, chemicals, minerals resulting from industrial processes. Nitrate(no3)- essential for plant growth, soluble in water and passes through the soil, low oxygen levels in infants, most serious in shallow water tables, high agricultural activity, well-drained soils, and reduced woodlands *particular concern bc of groundwater contamination. Sediment: loss of habitat, high turbidity (#1 pollutant in the u. s. )ag run-off is a important source of nutrients, which leads to cultural eutrophication (increased primary production) Trophic state of water bodies p, chlorophyll a, secchi depth (disk w/ string)
