Question 36 If the K_ow for the compound was 10^6, how many mg would have been f

Question

Question 36

If the K_ow for the compound was 10^6, how many mg would have been found in the water? Why are so there incredibly many different pesticides that have been tried and placed on the market? Into what type of tissue material do biaccumulating compounds partition (mostly)? Proteinaceous or lipid, and WHY? Not counting the common presence of chlorine, two chemical characteristics are typical of so-called "legacy" (aka old school) pesticides like DDE, dieldrin, etc. have led to a lot of problems. What are these two? What two molecular characteristics of octanol make it a useful surrogate for lipid material into which bioconcentration can occur? Draw the bad guy dioxin, namely 2, 3, 7, 8-tetrachlorodibenzodioxin. Include any hydrogens. Organohalogen compounds like the freons are rather stable in the environment, i e., they are persistent. However, they do not accumulate in biological tissue or soils or sediments Why not? (An example of a Freon is CCl_2F_2 which is Freon 12.) In a given environmental setting (e.g., Portland), compounds like PCBs and the flame retardant PBDEs are mostly found in the soil and sediments and in the lipid tissues of local organisms. How is it possible then that these compounds can reach places where they were never used? Like within the Arctic Circle ... in other words, what are the mechanisms involved in the movement?

Explanation / Answer

31) Most pesticides are not totally broad spectrum and hence a combination is often required to target all pests that might affect a plant. Moreover the increased harmful effects of pesticides calls for more research for newer and more different pesticides to be placed in the market. Thirs reason is the problem of resistance which renders pesticides useless and calls for the use of different pesticides.

32) Lipid. a lot of pesticides used have affinity for fat and hence have a tendency to accumulate in fat

33) Compounds with high lipid (fat) solubility, such as DDT bioaccumalate heavily.

They are not easily degraded in the environment due to their stability and low decomposition rates. They are long range transported and can lead to conatmination even in areas where they have never been used.

36) Freons do not have a tendency to accumulate in body tissues as they do not have similar affinity for tissue.They are however harmful because they displace air from the body and cause asphyxiation. They persist in the environment because of the relative no n reactivity in the lower atmosphere.They only exhibit reactivty in the stratosphere.

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.