Mercury

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The transformation ways of PCBs in the environment • PCBs become persistent organic pollutants in the envrinment (POPs) due to its chemical inertia. • Main transformation ways of PCBs include photochemical decomposition and biotransformation. • Photochemical decomposition :p314 The agitation of ultra violet can cause the breaking of C-Cl bond and produces aryl radicals and chlorine radicals. • Biodegradation:PCBs can be degraded by pseudomonads( 假单胞菌 ), etc. The less Cl content, the more easy the biodegradtion. • Transformation in internal animals:except accumulation, PCBs can also undergo transformation through metabolism, the speed of which is reduced with more chlorine ions in the molecule.
Hazards of PCBs • Affect the growth of aquatic plants; at 0.1-1 mg/L, reduce photosynthesis; at 10-100 mg/L, inhibit the growth of aquatic plants. • Most species of fish are senstitive to PCBs during all stages of their growth. 。 • The absorbtion of PCBs by birds can cause the expansion and damage of liver and kidney, internal bleeding, collapse of lien and thickened eggshell, etc. • PCBs can induce a series of symptons to mammals such as adenoma and cancer. • PCBs can cause skin ulcers, acnes, hydatoncus, liver damage and the increase of leukocytes, etc. Except causing cancers, PCBs can also be spread to infants and cause monstrosity.
Page 1 and 2: Environmental Chemistry Part 5 Typi
Page 3 and 4: • Typical organic pollutants PAHs
Page 5 and 6: Mercury (Hg) 1. Source and Distribu
Page 7 and 8: 2. Transport and Transformation of
Page 9 and 10: Mercury in the air • come from vo
Page 11 and 12: 4) Hg 2+ can easily form complex co
Page 13 and 14: Mercury in the soil • Over 95% of
Page 15 and 16: The methylation process of mercury
Page 17 and 18: Dimethyl mercury Under anaerobic co
Page 19 and 20: Transport and Transformation of Mer
Page 22 and 23: . Hazards of Mercury Pollution •
Page 24 and 25: . Prevention of Mercury pollution
Page 26 and 27: Environmental Chemistry Part 5 Typi
Page 28 and 29: asic characteristics of PCBs 1) Hig
Page 30 and 31: Transport and transfomation of PCBs
Page 32 and 33: The atmosphere is purified of PCBs
Page 34 and 35: The transport of PCBs in water •
Page 38 and 39: Degradation of PCBs • Substrate s
Page 40 and 41: 1) Sealing and storage • To seal
Page 42 and 43: Fusion medium method( 熔融介
Page 44 and 45: 4) Biodegradation • A potential m
Page 46 and 47: surface active agent • Definition
Page 48 and 49: Classification and properties of su
Page 50 and 51: 2. Cationic surfactant • The hydr
Page 52 and 53: 4. Nonionic surfactant • Nonionic
Page 54 and 55: 2) the relative position of hydroph
Page 56 and 57: 4) hydrophobic groups • The order
Page 58 and 59: 2. hazards 1) Surface active agent
Page 60 and 61: 4) The sterilization of high-concen
Page 62 and 63: 1. Bio-degradation of surface activ
Page 64 and 65: 4) Oxidation of aromatic compounds
Page 66 and 67: 2) Anionic surfactant • Anionic s
Page 68 and 69: The relationship between molecular
Page 70 and 71: 3 steps for the photocatalysic degr
Page 72: One of the key points in the resear

Mercury

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