Mercury
Mercury
Mercury
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The transformation ways of PCBs<br />
in the environment<br />
• PCBs become persistent organic pollutants in the envrinment<br />
(POPs) due to its chemical inertia.<br />
• Main transformation ways of PCBs include photochemical<br />
decomposition and biotransformation.<br />
• Photochemical decomposition :p314 The agitation of ultra<br />
violet can cause the breaking of C-Cl bond and produces aryl<br />
radicals and chlorine radicals.<br />
• Biodegradation:PCBs can be degraded by pseudomonads( 假 单<br />
胞 菌 ), etc. The less Cl content, the more easy the biodegradtion.<br />
• Transformation in internal animals:except accumulation, PCBs<br />
can also undergo transformation through metabolism, the<br />
speed of which is reduced with more chlorine ions in the<br />
molecule.