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As a group of highly complex industrial chemicals,chlorinated paraffins(CPs),also known as polychlorinated n-alkanes(PCAs),can be fall into short chain CPs(SCCPs,C10-13),medium chain CPs(MCCPs,C14-17) and long chain CPs(LCCPs,C18-30) with chlorine contents from 30-70 %by mass according to the length of carbon chains.