Question

what is the wnvironmemtal fate of the broadleaf herbicide? this answer should include:

- the proposed degradation pathway

- the meaning of the logPow, half life and EC50 for the environmental tox data.

Environmental tox data tx [Sterile soil = 4.7 h ㄴhall-le ts [Soil] = 1.6 h tx [uv, 245 nm] = 25.6 h 2 と. [uv, 340 nm] = 52.6 h EC50 [Daphnia] = 150 mg/L EC50 [Trout] = 53 mg/L Go [Chlorella] = 0.02 mg/L NOAEL [Quail-endpoint = SGPT-20 Human-related tox data- tx [rat, oral] = 3.5 h ltoctc nega

Answer 1

Environemental fate include the acute toxicity. and chronic toxicity. Acute toxicity can be due to accidental exposure with the herbicide due to inhalation or skin contact. Certain herbicides can be transported by leaching or surface runoff to contaminate groundwater or distant surface water sources. Some amount can be percolated through the soil particles and can be deposited in low ground areas. A continuous exposure for long period of time can cause changes in the surface or earth or in affected animal that can lead to chronic toxicity.

The degradation pathway is the microbial degradation pathway.

Log P is a measure of lipophilicity. It is partition coefficient of a molecule between an aqueous and lipophilic phases, usually octanol and water.

Half life is the time needed for a compound to degrade and become half of the original quantity.

EC₅₀ is the median effective concentration which is the concentration of test substance which results in a 50 percent reduction in either algae growth (EbC50) or algae growth rate (ErC50) or Daphina immobilization. It is halfway between the baseline and maximum, thus it indicates the potency of the pesticide.

LC50 is the concentration of the substance required to kill 50% of the population of affected animals.