Sentence:  It should be possible to free <WSD>carbon</WSD> tetrachloride of any interfering substances by the usual purification methods followed by prechlorination prior to addition of radioactive chlorine . 
Meaning of the word marked with <WSD> tags:  a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined