What are the sources of chlorine and what is its role in our lives and in PVC?
Chlorine is one of the most common elements in nature, where it is even more plentiful than carbon. Many people know that common salt contains more than 60 % of chlorine, and contrary to what many people may sometimes believe, organic substances containing chlorine are also very common in nature. Important natural sources of organochlorined compounds are the oceans, forest fires and fungal activity. Scientists have identified more than 3,000 naturally-occurring chlorine-based substances. They are made by marine organisms (sponges, corals, sea slugs, jellyfish and seaweeds), plants, seeds, fungi, lichens, bacteria, freshwater algae and insects. Some phytoplankton and seaweeds produce chlorinated metabolites tentatively identified as trichloroethylene and perchloroethylene, substances well known as chlorinated solvents. The oceans naturally release some three million tonnes of methyl chloride into the atmosphere every year. In the PVC resin, the presence of chlorine confers some unique a
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