Lec14 Flashcards
Chemical pollutants classified :
عددي
- By intended use
- By chemical structure
- By environmental characteristics
- By the mechanism of action
- By when released into environment and became a known environmental issue
Are described as ones that were previously released into the environment by man
legacy contaminants
example where the distinction between legacy and emerging contaminants is not clear.
Arsenic
describes the entirety of all synthetic plastics and their products, which are smaller than (5 mm)
Microplastics
Microplastic released only directly into the environment
T/F?
F, released directly into the environment or formed indirectly in the environment.
Macroplastics are commonly made of polyethylene (PE), (PP), (PS), (PET), and (PVC).
T/F?
F, Microplastics
are intentionally added to personal care products as toothpaste, and body scrubs, masks, sunscreen, and mascara.
Microbeads
composed of Polyethylene.
microbeads
are the synthetic fibers used in wool and polyester textiles.
Microfiber plastics
macroplastics , mesoplastics are small plastic particles which start as greater than 5 mm.
T/F?
F, are large plastic particles
break down to the microscale once released into the environment can be by?
عددي
✓ fragmentation.
✓ weathering by UV radiation.
✓ waves.
✓ animals.
1- Remote mountain lakes.
2-Shore and deep-sea sediments.
3- In all five subtropical ocean gyres.
Where Microplastics are found
are regarded as a global issue due to their toxicity effects on fish and humans.
Microplastics (MPs)
are a group of insecticides with a shared mode of action.
Neonicotinoids
advantages of neonicotinoids
عددي
- High specificity with Insect affected, and lower hazard to mammals and birds.
- No expected cross-resistance in insects to chlorinated hydrocarbons, because they have different modes of action.
- relatively low degree of resistance development by insects.
